JP5646973B2 - Thermal conductivity measurement device, thermal conductivity calculation device, thermal conductivity calculation program, and thermal conductivity measurement method - Google Patents

Description

  The present invention relates to a thermal conductivity measuring device, a thermal conductivity computing device, a thermal conductivity calculating program, and a thermal conductivity measuring method for measuring the thermal conductivity of a plate-like piece to be measured.

  Conventionally, the following method is known as a method for measuring the thermal conductivity k of a plate-like piece to be measured.

  In this method, as shown in FIG. 20, the measured piece 100 is arranged in a posture in which the main surface portion 100a is vertical (vertical arrangement), and one end 102 is heated by a heater H or the like under natural air cooling. . In the measured piece 100, the temperature of the measured piece 100 is detected at a plurality of locations (seven locations in FIG. 20) x1, x2,... Along the direction from one end portion 102 to the other end portion 104. And it was vertically arranged under natural air cooling using the calculated temperature at each position of the measured piece 100 and a calculation formula (specifically, a natural convection type and a radial type of vertically arranged flat plates). The heat transfer coefficient h of the measured piece 100 is calculated. The heat transfer coefficient h has less error than the heat transfer coefficient h obtained by detecting the temperature at each position of the flat plate arranged in another posture and calculating the calculation for the flat plate in the other posture. Therefore, the heat transfer coefficient h of the measured piece obtained by the above calculation formula (natural convection formula and radiation formula), and the temperature at each position x1, x2,. The thermal conductivity k of the measured piece 100 can be accurately derived from the calculation formula for calculating the fin efficiency.

  On the other hand, a method described in Non-Patent Document 1 is also known as a method for measuring the thermal conductivity k of a plate-shaped measurement piece. In this method, as shown in FIG. 21, one end (base) 102 of a measured piece 100 arranged in a vacuum is sandwiched by a cooling member 106, and the tip which is the other end of the measured piece 100. Heaters H1 and H2 are provided in the vicinity of the cooling member 106 on the part 104 and base 102 side, respectively. Then, the measurement piece 100 is heated by the heaters H1, H2, and the temperature of the measurement piece 100 is measured at a plurality of locations (three locations in FIG. 21) x1, x2,... Along the direction from the base portion 102 to the tip portion 104. To do.

  Since it is arrange | positioned in the vacuum, the to-be-measured piece 100 is a vacuum heat insulation state. For this reason, heat radiation from the surface of the measured piece 100 to the space around the measured piece 100 by the heat flowing in the measured piece 100 from the heaters H1 and H2 toward the cooling member 106 can be ignored. Therefore, the temperature measured at each position x1, x2,... Of the measurement piece 100 and the heat flow Q in the measurement piece 100 and the heater of the measurement piece 100 without considering the heat transfer coefficient h of the measurement piece 100. The thermal conductivity k of the measured piece 100 can be derived from a temperature gradient based on the temperature at the positions of H1 and H2 by a predetermined calculation formula.

Journal of Heat Transfer, AUGUST 1997, Vol.119, P401-405

  In the first method for measuring the thermal conductivity, when calculating the heat transfer coefficient h, the thermal conductivity k of the piece 100 to be measured is obtained using the natural convection type and radiation type of flat plates arranged vertically. .

  On the other hand, in the second method for measuring the thermal conductivity (method described in Non-Patent Document 1), instead of obtaining the heat transfer coefficient h, the measured piece 100 is placed in a vacuum to be in a vacuum insulation state, As a result, the heat loss of the heat flow Q from the heaters H1 and H2 flowing in the measured piece 100 can be ignored, and the thermal conductivity k is obtained from the heat flow Q and the temperature gradient of the measured piece 100. Therefore, when the measured piece 100 is disposed in the air, the thermal conductivity k cannot be obtained with high accuracy.

  Therefore, a thermal conductivity measuring device, a thermal conductivity calculation device, and a thermal conductivity calculation that can determine the thermal conductivity of the measured piece without arranging the plate-like measured piece vertically or in a vacuum. A program and a thermal conductivity measurement method are provided.

  Therefore, in order to solve the above problems, the present invention is a thermal conductivity measuring device for deriving the thermal conductivity of a plate-like piece to be measured, a heating unit for heating one end of the piece to be measured, A temperature distribution detector that detects the temperature distribution of the measurement piece continuously or intermittently along the direction from one end of the measured piece to the other end, and the thermal conductivity of the measurement piece. An arithmetic device for calculating. And the said arithmetic unit is the memory | storage part which stores the heat transfer coefficient for a calculation, and the 1st heat conduction resistance which is resistance when heat flows inside the said to-be-measured piece from one end part to the other end part, A first thermal resistance ratio, which is a ratio to a first heat transfer resistance that is a resistance when heat is generated from the surface of the measurement piece to the space around the measurement piece, and stored in the storage unit. A measurement piece thermal conductivity deriving unit for obtaining the thermal conductivity of the measurement piece from the heat transfer coefficient for calculation and the temperature distribution of the measurement piece detected by the temperature distribution detection unit; The calculation heat transfer coefficient is based on a plate-like member temperature distribution along a direction from one end portion to the other end portion of the member when the one end portion of the plate-like member having a known thermal conductivity is heated. .

  According to the thermal conductivity measuring device of the present invention, the heat transfer derived based on the temperature distribution (plate-shaped member temperature distribution) along the direction from one end of the plate-shaped member having a known thermal conductivity toward the other end. By using the rate (heat transfer coefficient for calculation), it is necessary to calculate the heat transfer coefficient of the measured piece by calculation using a calculation formula such as a natural convection formula or a radiation formula for the plate-like measured piece arranged vertically. In addition, the thermal conductivity of the measured piece can be obtained.

  Specifically, if the heat transfer coefficient of the measured piece and the first thermal resistance ratio obtained from the temperature distribution (temperature at each position) of the measured piece are known, the heat of the measured piece can be obtained using these. Conductivity can be determined. Therefore, to simulate the heat transfer coefficient of the plate-like member (heat transfer coefficient for calculation) obtained from the heat conductivity and temperature distribution of the plate-like member whose heat conductivity is known with the heat transfer coefficient of the measured piece. Thus, the thermal conductivity of the measured piece can be obtained from the heat transfer coefficient for calculation and the temperature distribution of the measured piece.

  As described above, according to the thermal conductivity measuring device of the present invention, the plate-shaped member having a vertical arrangement is obtained by imitating the heat transfer coefficient of the plate-shaped member having a known heat conductivity with the heat transfer coefficient of the measured piece. Since it is possible to derive the thermal conductivity of the measurement piece without performing a calculation using a natural convection formula or a radiation formula for the measurement piece, the measurement piece need not be arranged vertically.

  Moreover, the heat transfer coefficient of the measured piece, which is a coefficient for handling the heat transfer between the measured piece and the space around the measured piece (more specifically, for calculation that simulates the heat transfer coefficient of the measured piece Since the thermal conductivity of the measured piece is calculated using the heat transfer coefficient), the calculation result includes the effect of heat radiation from the measured piece to the surrounding space. The thermal conductivity of the piece to be measured can be obtained without placing it in a vacuum insulation state.

  Specifically, the heat transfer coefficient for calculation may be stored in the storage unit as a function of the plate member temperature distribution. If the heat transfer coefficient for calculation stored in the storage unit as a function of such a temperature distribution is used, the thermal conductivity of the measured piece can be obtained by calculation only by measuring the temperature distribution of the measured piece. .

  Further, the heating unit can heat one end portion of a comparison piece that is a plate-like member having a known thermal conductivity, and the temperature distribution detection unit is directed from one end portion to the other end portion of the comparison piece. The temperature distribution of the comparison piece can be detected continuously or intermittently along the line, and the arithmetic unit is a resistance when heat flows through the comparison piece from one end to the other end. A second heat resistance ratio that is a ratio of a heat conduction resistance of 2 and a second heat transfer resistance that is a resistance when heat is emitted from the surface of the comparison piece to the space around the comparison piece; A comparison piece heat transfer coefficient deriving unit for obtaining a heat transfer coefficient of the comparison piece from the heat conductivity of the comparison piece and the temperature distribution of the comparison piece detected by the temperature distribution detection unit, and the storage unit The heat transfer coefficient of the comparison piece obtained by the comparison piece heat transfer coefficient deriving unit may be stored as the heat transfer coefficient for calculation. . Thus, by actually heating a comparison piece having a known thermal conductivity and using the heat transfer coefficient obtained from the temperature distribution as a heat transfer coefficient for calculation, it is also possible to obtain a plate-like piece to be measured vertically arranged. The thermal conductivity of the measured piece can be obtained without calculating the heat transfer coefficient of the measured piece by calculation using a calculation formula such as a natural convection formula or a radiation formula.

  In this case, the thermal conductivity of the object to be measured may be obtained by obtaining the temperature distribution of the comparison piece and the piece to be measured by one heating unit and one temperature distribution detecting unit, respectively, or by different heating parts. The comparison piece and the measurement piece may be separately heated, and the temperature distributions of the comparison piece and the measurement piece may be separately detected by different temperature distribution detection units.

  When heating and temperature distribution detection are separately performed, the heating unit includes a measurement piece heating unit that heats one end of the measurement piece, and one end of a plate-like comparison piece having a known thermal conductivity. The temperature distribution detecting unit continuously or intermittently along the direction from one end portion of the side fixed piece to the other end portion, the temperature distribution of the piece to be measured. And a comparison piece temperature distribution detection unit for detecting the temperature distribution of the comparison piece continuously or intermittently along the direction from one end to the other end of the comparison piece. The measured piece thermal conductivity deriving unit is detected by the first thermal resistance ratio, the heat transfer coefficient for calculation stored in the storage unit, and the measured piece temperature distribution detecting unit. The thermal conductivity of the measurement piece may be obtained from the temperature distribution of the measurement piece.

  The thermal conductivity measuring apparatus according to the present invention may include an atmosphere control means for controlling the periphery of the measured piece and the periphery of the comparison piece to the same atmospheric condition. The atmospheric condition in the present invention means the wind speed, wind direction, temperature, etc. around the measured piece and around the comparative piece.

  In such a configuration, by controlling the atmospheric conditions around the measurement piece and the comparison piece by the atmosphere control means, it is possible to detect the temperature distribution of the measurement piece and the temperature distribution of the comparison piece under the same atmospheric conditions. . Thereby, the influence based on the difference in atmospheric conditions when measuring the temperature distribution of the measurement piece and the comparison piece can be eliminated from the thermal conductivity of the measurement piece obtained using the heat transfer coefficient of the comparison piece. . That is, since the influence based on the difference in the atmospheric condition is excluded in the calculation when calculating the thermal conductivity of the measurement piece using the heat transfer coefficient of the comparison piece, the thermal conductivity of the measurement piece can be obtained more accurately. be able to.

  The measurement piece thermal conductivity deriving unit is detected by the first piece of thermal resistance ratio and the heat transfer coefficient of the comparison piece obtained by the comparison piece heat transfer coefficient deriving unit and the measurement piece temperature distribution detection unit. A first derivation unit that obtains the thermal conductivity of the measured piece from the temperature distribution of the measured piece; and one or more thickness adjustments in which the measured piece has a known thermal conductivity with the measured thin piece and has a plate shape When configured by laminating thin pieces, the thermal conductivity of the piece to be measured, the thickness of the piece to be measured, the thickness of the piece to be measured, and the thickness adjusting piece obtained by the first derivation unit A second derivation unit that obtains the thermal conductivity of the measured thin piece from the thermal conductivity of the thin piece and the thickness of the thickness adjusting thin piece.

  According to such a configuration, even if the test thin piece is thin and it is difficult to obtain the thermal conductivity, the test thin piece and the thickness adjusting thin piece are laminated to form a measured piece, whereby the thermal conductivity of the test thin piece is obtained. Can be determined relatively accurately. In other words, the temperature gradient of heat flowing from one end to the other end is calculated by increasing the cross-sectional area through which the heat flow from one end to the other end passes by laminating the test flake and the thickness adjustment flake. Therefore, it is possible to obtain the thermal conductivity of a thin test piece having a small thermal conductivity.

  Further, by using the thickness adjusting thin piece, if there is one test thin piece, the thermal conductivity of this test thin piece can be obtained.

  It is preferable to provide a comparison piece constituted by laminating a plurality of comparison thin pieces having the same or different thermal conductivity.

  According to this configuration, by combining a plurality of comparative thin pieces, the temperature distribution (temperature gradient) of the comparison piece is approximated to the temperature distribution (temperature gradient) of the measurement piece, so that the thermal conductivity of the comparison piece and the measurement piece are compared. Therefore, the accuracy of the thermal conductivity of the measured piece obtained using the heat transfer coefficient of the comparative piece is further improved.

  Further, in order to solve the above-mentioned problem, the present invention is a thermal conductivity calculation device for calculating the thermal conductivity of a plate-shaped measurement piece, storing a calculation heat transfer coefficient and measuring the measurement target. A storage unit for storing a temperature distribution of the measurement piece continuously or intermittently detected along a direction from the one end portion of the measurement piece to the other end portion in a state where one end portion of the piece is heated; Heat is emitted from the surface of the measurement piece to the space around the measurement piece, the first heat conduction resistance that is resistance when heat flows from one end to the other end of the measurement piece. A first heat resistance ratio that is a ratio to the first heat transfer resistance that is a resistance of the operation, a heat transfer coefficient for calculation stored in the storage unit, and the measured piece stored in the storage unit A measurement piece thermal conductivity deriving unit that obtains the thermal conductivity of the measurement piece from the temperature distribution; And the said heat transfer coefficient for calculation is based on the plate-shaped member temperature distribution along the direction which goes to the other end part from the one end part in the said member when the one end part of the plate-shaped member with known heat conductivity is heated. ing.

  According to the thermal conductivity measuring device of the present invention, by using the heat transfer coefficient for calculation based on the plate-like member temperature distribution along the direction from one end of the plate-like member whose heat conductivity is known to the other end. It is possible to obtain the thermal conductivity of a measured piece without calculating the heat transfer coefficient of the measured piece by calculation using a natural convection formula or a radiation formula for a plate-like measured piece arranged vertically. it can. Accordingly, the thermal conductivity of the measurement piece can be obtained without arranging the measurement piece vertically.

  Moreover, since the thermal conductivity of the measured piece is obtained using the heat transfer coefficient (heat transfer coefficient for calculation), the calculation result includes the influence of heat radiation from the measured piece to the surrounding space. Thus, the thermal conductivity of the measurement piece can be obtained without placing the measurement piece in a vacuum and bringing it into a vacuum heat insulation state.

  Specifically, the heat transfer coefficient for calculation may be stored in the storage unit as a function of the plate member temperature distribution. If the heat transfer coefficient for calculation stored in the storage unit as a function of the temperature distribution is used, the temperature distribution of the measured piece can be simply input to the thermal conductivity calculating device, and the heat transfer of the measured piece can be performed. The rate is determined.

  In addition, the storage unit includes the heat transfer coefficient of the comparison piece, which is a plate-like member having a known thermal conductivity, and one end portion to the other end portion of the comparison piece in a state where one end portion of the comparison piece is heated. And the temperature distribution of the comparison piece detected continuously or intermittently along the direction toward, and the calculation unit heats the inside of the comparison piece from one end to the other end. Second thermal resistance which is the ratio of the second heat conduction resistance which is the resistance to the second heat transfer resistance which is the resistance when heat is emitted from the surface of the comparison piece to the space around the comparison piece A comparison piece heat transfer coefficient deriving unit for obtaining a heat transfer coefficient of the comparison piece from the ratio, the thermal conductivity of the comparison piece stored in the storage unit, and the temperature distribution of the comparison piece stored in the storage unit The comparison piece heat transfer coefficient deriving unit has the heat transfer coefficient of the comparison piece obtained in the comparison piece heat transfer coefficient deriving unit. It may be stored in the storage unit as a serial arithmetic heat transfer coefficient.

  In this way, by actually heating a comparison piece having a known thermal conductivity and inputting the heat transfer coefficient obtained from the temperature distribution to the heat conductivity calculation device, and using this as the heat transfer coefficient for calculation. However, the thermal conductivity of the measured piece can be obtained without calculating the heat transfer coefficient of the measured piece by calculation using a natural convection formula or a radiation formula for a plate-like measured piece arranged vertically. Can do.

  Moreover, in order to solve the above-mentioned problem, the present invention is a thermal conductivity calculation program for calculating the thermal conductivity of a plate-like measurement piece, in a state where one end of the measurement piece is heated. In the member when the temperature distribution of the measured piece continuously or intermittently detected along the direction from the one end portion to the other end portion of the measured piece and one end portion of the plate-like member is heated The computer receives the heat transfer coefficient for calculation based on the first temperature distribution along the direction from the one end portion toward the other end portion, so that the computer can be connected to the inside of the measured piece from the one end portion to the other end portion. A first heat conduction resistance that is a resistance when heat flows toward the first and a first heat transfer resistance that is a resistance when heat is emitted from the surface of the measurement piece to the space around the measurement piece. First heat resistance ratio, the heat transfer coefficient for calculation, and the piece to be measured And temperature distribution, is from function as measured Katanetsu conductivity deriving means for obtaining a thermal conductivity of the measured piece.

  By causing the computer to read such a program, if the computer inputs the temperature distribution of the measured piece and the heat transfer coefficient for calculation based on the temperature distribution of the plate-like member whose thermal conductivity is known, the computer The thermal conductivity of the measured piece is calculated.

  In addition, this program does not calculate the heat transfer coefficient of the measured piece by calculation using a natural convection formula or a radiation formula for the plate-shaped measured piece arranged vertically. The rate can be determined. Therefore, the temperature distribution of the measurement piece input to the computer may be the temperature distribution of the measurement piece arranged in another posture (for example, horizontal arrangement) instead of the temperature distribution of the measurement piece arranged vertically. In addition, in this program, the thermal conductivity of the measurement piece is obtained using the heat transfer coefficient (calculation heat transfer coefficient), so the calculation results include the effect of heat radiation from the measurement piece to the surrounding space. Therefore, the temperature distribution of the measurement piece input to the computer may be the temperature distribution of the measurement piece arranged in the air instead of in a vacuum.

  Further, in order to solve the above problems, the present invention provides a thermal conductivity measurement method for deriving the thermal conductivity of a plate-like piece to be measured, comprising heating one end of the piece to be measured, A measurement piece temperature distribution detecting step for detecting a temperature distribution of the measurement piece continuously or intermittently along a direction from one end portion of the measurement piece to the other end portion, and the inside of the measurement piece from the one end portion to the other end A first heat conduction resistance which is a resistance when heat flows toward the part, and a first heat transfer resistance which is a resistance when heat is emitted from the surface of the measurement piece to the space around the measurement piece. Heat transfer for calculation based on the first thermal resistance ratio, which is the ratio of the plate member, and the plate member temperature distribution along the direction from one end to the other end of the member when one end of the plate member is heated And the temperature distribution of the measured piece detected in the measured piece temperature distribution detecting step It comprises a measured Katanetsu conductivity deriving step of determining the thermal conductivity of the measurement piece, a.

  According to the thermal conductivity measurement method of the present invention, the temperature distribution of the measured piece is detected, and based on the plate-like member temperature distribution along the direction from one end of the plate-like member having a known thermal conductivity to the other end. By using the heat transfer coefficient for calculation, it is possible to calculate the heat transfer coefficient of the measured piece without calculating the heat transfer coefficient of the measured piece by a calculation formula such as a natural convection formula or a radiation formula for a plate-like measured piece arranged vertically. The thermal conductivity of the measurement piece can be obtained. Accordingly, the thermal conductivity of the measurement piece can be obtained without arranging the measurement piece vertically.

  Moreover, since the thermal conductivity of the measured piece is obtained using the heat transfer coefficient (heat transfer coefficient for calculation), the calculation result includes the influence of heat radiation from the measured piece to the surrounding space. Thus, the thermal conductivity of the measurement piece can be obtained without placing the measurement piece in a vacuum and bringing it into a vacuum heat insulation state.

  The heat transfer coefficient for calculation may be obtained in advance as a function of the temperature distribution of the plate-like member, and the temperature distribution is obtained by actually heating a plate-like member (comparison piece) having a known thermal conductivity. You may ask for.

  When calculating the heat transfer coefficient for calculation from the temperature distribution obtained by actually heating the comparison piece, one end of the plate-like comparison piece having a known thermal conductivity is heated, and the other end of the comparison piece is changed from one end to the other. A comparison piece temperature distribution detection step for detecting the temperature distribution of the comparison piece that is continuous or intermittent along the direction toward the portion, and resistance when heat flows from one end portion to the other end portion in the comparison piece. A second heat resistance ratio that is a ratio between a certain second heat conduction resistance and a second heat transfer resistance that is a resistance when heat is emitted from the surface of the comparison piece to the space around the comparison piece; A comparison piece heat transfer coefficient derivation step for obtaining a heat transfer coefficient of the comparison piece from the heat conductivity of the comparison piece and the temperature distribution of the comparison piece detected in the comparison piece temperature distribution detection step; The measured piece thermal conductivity deriving step is calculated in the comparative piece heat transfer coefficient deriving step. The heat transfer coefficient of 較片 as the arithmetic thermal conductivity may be obtained a thermal conductivity of the measured piece.

  In this case, before the comparison piece temperature distribution detection step, a comparison piece forming step of forming the comparison piece by stacking a plurality of comparison thin pieces having the same or different thermal conductivity is provided. In the comparison piece formation step, A plurality of the same or different thermal conductivities so that the temperature distribution detected in the comparison piece temperature distribution detection step is close to the temperature distribution of the measurement piece detected in the measurement piece temperature distribution detection step. It is preferable that the comparison piece is formed by combining the comparison pieces.

  According to such a configuration, the heat of the comparison piece is obtained by combining the plurality of comparison thin pieces so that the temperature distribution (temperature gradient) of the comparison piece approximates the temperature distribution (temperature gradient) of the measurement piece. Since the conductivity and the thermal conductivity of the measurement piece are approximate, the accuracy of the thermal conductivity of the measurement piece obtained using the heat transfer coefficient of the comparison piece is further improved.

  Before the measurement piece temperature distribution detection step, a measurement piece creation step of forming the measurement piece by stacking a plurality of measurement thin pieces may be provided.

  According to such a configuration, even for a thin test piece having a small thermal conductivity, the thermal conductivity of the test thin piece can be obtained by laminating a plurality of these test pieces to form a measured piece. In other words, if the plate-like member is made of the same material, the fact that the thermal conductivity obtained by one sheet and the thermal conductivity obtained by stacking a plurality of sheets have the same value is utilized, and a plurality of test slices are laminated to be measured. By making the cross-sectional area through which the heat flow from one end to the other end passes, the temperature gradient of the heat flowing from one end to the other end is set to a size suitable for calculation. It is also possible to determine the thermal conductivity of a test flake having a small thermal conductivity.

  Further, before the measurement piece temperature distribution detecting step, the measurement piece is formed by laminating the measurement piece and one or more plate-shaped thickness adjustment pieces having a known thermal conductivity. The thermal conductivity of the measurement piece, the thickness of the measurement piece, the thickness of the measurement piece, and the heat conduction of the thickness adjustment piece obtained in the measurement piece forming step and the measurement piece thermal conductivity derivation step A measurement thin piece thermal conductivity deriving step for obtaining a thermal conductivity of the measurement target thin piece from the rate and the thickness of the thickness adjusting thin piece.

  According to such a configuration, the cross-sectional area through which the heat flow from one end to the other end is increased by laminating the measured thin piece and the thickness adjusting thin piece to create the measured piece. The temperature gradient of the heat flowing to the end can be set to a magnitude suitable for calculation, and thereby the thermal conductivity of the measurement piece that is thin or has a low thermal conductivity can also be obtained. In addition, since the specimen to be measured is prepared using the thickness adjustment thin piece, even when the specimen to be measured cannot be produced with a sufficient thickness even if only a few specimen thin pieces are laminated, Thermal conductivity can be determined.

  As described above, according to the present invention, the thermal conductivity measuring device and the thermal conductivity capable of obtaining the thermal conductivity of the measurement piece without arranging the plate-like measurement piece in a vertical arrangement or in a vacuum. An arithmetic device, a thermal conductivity calculation program, and a thermal conductivity measurement method can be provided.

It is the top view which showed roughly the structure of the state which installed the to-be-measured piece and the comparison piece in the heat conductivity measuring apparatus which concerns on 1st Embodiment. It is the front view which showed roughly the structure of the thermal conductivity measuring apparatus of FIG. It is a figure for demonstrating the structure of the to-be-measured piece which laminated | stacked the to-be-measured piece main body and the thickness adjustment thin piece. It is a figure for demonstrating the structure of the comparison piece which laminated | stacked the comparison thin piece. It is a figure which shows the equivalent thermal conductivity for every combination of the comparison thin piece in the comparison piece which laminated | stacked the comparison thin piece. It is a figure for demonstrating the structure which has arrange | positioned the temperature sensor inside a to-be-measured piece and a comparison piece. It is a figure for demonstrating each code | symbol in a to-be-measured piece and a comparison piece. It is the top view which showed roughly the structure of the state which installed the to-be-measured piece and the comparison piece in the heat conductivity measuring apparatus which concerns on 2nd Embodiment. It is the front view which showed schematically the structure of the thermal conductivity measuring apparatus of FIG. FIG. 10A is a front view schematically showing a structure in which a measurement piece and a comparison piece are installed in the thermal conductivity measurement device according to the third embodiment, and FIG. It is the figure which showed the state which installed the heat insulation member in the measurement part of the thermal conductivity measuring apparatus of 10 (A). It is XI-XI sectional drawing of FIG. 10 (B). It is the top view which showed roughly the structure of the temperature sensor part in the thermal conductivity measuring apparatus of 3rd Embodiment. It is the front view which showed schematically the structure of the temperature detection part of other embodiment. It is the front view which showed schematically the structure of the temperature detection part of other embodiment. It is a figure for demonstrating the attachment member in the measurement part of other embodiment, Comprising: FIG. 15 (A) shows the state before installing a to-be-measured piece, FIG.15 (B) shows a to-be-measured piece on an attachment member. It is a figure which shows the state installed. It is the top view which showed roughly the structure of the state which has arrange | positioned the to-be-measured piece (or comparison piece) in the thermal conductivity measuring apparatus which concerns on other embodiment. It is the top view which showed roughly the structure of the state which has arrange | positioned the to-be-measured piece to the heat conductivity measuring apparatus which concerns on other embodiment. It is a figure for demonstrating the structure of the to-be-measured piece when measuring the heat conductivity of a soft material. It is a figure which shows the relationship between the thermal conductivity of a soft material, and the effective thermal conductivity of the to-be-measured piece with respect to the thickness of the thickness adjustment thin piece which pinches | interposes this. It is a figure for demonstrating the conventional thermal conductivity measuring method. It is a figure for demonstrating the conventional thermal conductivity measuring method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 1 is a plan view schematically showing a structure in which a measurement piece and a comparison piece are installed in the thermal conductivity measuring apparatus according to the first embodiment of the present invention, and FIG. 2 is shown in FIG. It is the front view which showed roughly the structure of the heat conductivity measuring apparatus.

  First, with reference to FIG.1 and FIG.2, the structure of the thermal conductivity measuring apparatus 10 by 1st Embodiment of this invention is demonstrated.

Thermal conductivity measuring apparatus 10 of the present embodiment is for measuring the thermal conductivity k ₁ in the direction along the main surface portion 12a of the plate-shaped object to be measured pieces 12, as shown in FIGS. 1 and 2, A measurement unit 20 on which the measurement piece 12 and the comparison piece 16 can be installed, and a calculation device (thermal conductivity calculation device) 40 that calculates the thermal conductivity k ₁ of the measurement piece 12 are provided.

The measurement target piece 12 installed in the measurement unit 20 is a plate-like member such as a printed board or a graphite plate having high thermal conductivity. The measurement target piece 12 has an elongated shape extending linearly in one direction. As shown in FIGS. 1 and 2, this piece 12 to be measured is installed in the thermal conductivity measuring device 10 with one end 13 a held, and the thermal conductivity k _{1 in the} longitudinal direction is measured. When the measured piece 12 is composed of a single member, and as shown in FIG. 3, the measured piece main body (measured thin piece) 14 and one or more thickness adjusting thin pieces 15 are laminated. May be configured. The to-be-measured piece 12 of this embodiment has a rectangular shape long in the left and right in FIG. 1, for example, a length of 10 mm to 1 m, a width of 5 mm to 100 mm, and a thickness of 0.1 mm to 10 mm.

Thickness adjusting flake 15 can not be measured is the thermal conductivity k _1a by the thermal conductivity k _1a of the measured piece body 14 thin or the thermal conductivity k _1a can not be measured under measurement element main body 14 is too small In this case, a measurement piece 12 having a larger thermal conductivity k than that of the measurement piece main body 14 is laminated with the measurement piece main body 14 to measure the thermal conductivity k _1a of the measurement piece main body 14. It is for making it possible. The thickness adjusting flake 15, the thermal conductivity k _p is formed by a known material. Therefore, if the thermal conductivity k ₁ of the measured piece 12 in which the measured piece main body 14 and the thickness adjusting thin piece 15 are laminated, the thermal conductivity of the measured piece main body 14 can be obtained from the thermal conductivity k _1. k _1a can be obtained by calculation.

  In the present embodiment, for example, the measured piece main body 14 has a length of 10 mm to 1 m, a width of 5 mm to 100 mm, and a thickness of 0.1 mm to 10 mm, and the thickness adjusting flake 15 has a length of 10 mm to 10 mm. 1 m, width is 5 mm to 100 mm, and thickness is 0.1 mm to 10 mm. However, the measurement piece 12 in which the measurement piece main body 14 and the thickness adjusting thin piece 15 are laminated has a length of 10 mm to 1 m, a width of 5 mm to 100 mm, and a thickness of 0.1 mm to 10 mm as described above. In this manner, the length, width, and thickness of the measured piece main body 14 and the thickness adjusting thin piece 15 are set.

  In the measured piece 12 of the present embodiment, the measured piece main body 14 and the thickness adjusting thin piece 15 are bonded by the double-sided tape 18, but the present invention is not limited thereto, and may be bonded by an adhesive or the like.

Comparison piece 16 installed in the measurement unit 20, the thermal conductivity k ₂ are known plate-like member, used to determine the heat transfer coefficient h _2. That is, the thermal conductivity measuring device 10 of the present embodiment uses the heat transfer coefficient h ₂ of the comparison piece 16 obtained from the comparison piece 16 having a known heat conductivity k _{2 as} the heat transfer coefficient h ₁ of the measured piece 12. constructive and obtains a thermal conductivity k ₁ of the measurement piece 12 by using the heat transfer coefficient h _2. Since the heat transfer coefficient h and the thermal conductivity k vary depending on the shape of the member, the shape of the comparison piece 16 may be approximate to the shape of the measurement piece 12 (including the same shape as the measurement piece 12). preferable.

Comparison strip 16, as shown in FIG. 4 (A) through FIG. 4 (C), the plurality of (two in this embodiment) to be able to adjust the thermal conductivity _{k 2} comparison flakes 16a, 16b, It is comprised by laminating | stacking 16c. The comparative slices 16a, 16b, 16c,... Have different thermal conductivities k _2a , k _2b , k _2c,. As described above, the thermal conductivity k _2a , k _2b , k _2c ,... And the comparative thin pieces 16a, 16b, 16c,. The (temperature gradient) can be approximated to the temperature distribution (temperature gradient) of the measurement target piece 12. Thereby, the thermal conductivity k ₂ of the comparison piece 16 and the thermal conductivity k ₁ of the measurement piece 12 can be brought close to each other, and the thermal conductivity k ₂ of the comparison piece 16 obtained from the known comparison piece 16 is obtained. When the thermal conductivity k ₁ of the measured piece 12 is obtained using the heat transfer coefficient h ₂ , the accuracy of the thermal conductivity k ₁ of the measured piece 12 can be improved.

Each of the comparative slices 16a, 16b, 16c,... Is a plate-like member whose thermal conductivity k _2a , k _2b , k _2c,. These comparative thin pieces 16a, 16b, 16c,... Are formed so as to have different thermal conductivities k and thicknesses. In this embodiment, the copper plate 16a, the aluminum plate 16b, and the SUS plate 16c are used as a comparative thin piece. Each of the comparison thin pieces 16a, 16b, and 16c has a length of 15 cm and a width of 2 cm, and three types of thicknesses of 1 mm, 0.5 mm, and 0.2 mm are prepared for each material.

In the thermal conductivity measuring apparatus 10 of the present embodiment, since the thermal conductivity k ₂ of the comparative piece 16 is required when measuring the thermal conductivity k ₁ of the measurement piece 12, the comparison slice 16a, 16b , equivalent thermal conductivity k ₂ of the comparative piece 16 is obtained in advance for each combination of 16c. Equivalent thermal conductivity k ₂ when combined each comparison slice 16a, 16b, and 16c in the present embodiment is a value as shown in Table 1 of FIG. 5 and the following.

  In the present embodiment, each of the comparative thin pieces (for example, 16 a and 16 b) is bonded by the double-sided tape 18 in the same manner as the bonding of the measured piece main body 14 and the thickness adjusting thin piece 15.

  The measurement unit 20 includes a fixing unit 22 that holds the measurement piece 12 and the comparison piece 16, a temperature detection unit (temperature distribution detection unit) 30 that detects the temperature distribution of the measurement piece 12 and the comparison piece 16, and a fixation unit 22. The air flow toward the measurement piece 12 and the comparison piece 16 in a state of being held by the fixing unit 22 from the blower means 37 and the air blowing means 37 for blowing air to the measurement piece 12 and the comparison piece 16 held in And a rectifying plate 38.

  The fixing portion 22 fixes the measurement piece 12 by holding one end portion (first end portion) 13a in the longitudinal direction of the measurement piece 12. The fixing portion 22 fixes the comparison piece 16 by holding one end portion (third end portion) 17 a in the longitudinal direction of the comparison piece 16. That is, the fixing portion 22 of this embodiment can hold the measured piece 12 and the comparison piece 16 at the same time. Specifically, the fixed portion 22 includes the first end portion 13a and the comparison piece of the measurement piece 12 such that the measurement piece 12 and the comparison piece 16 are parallel to each other and the main surface portions 12a and 16a are in a horizontal posture. The to-be-measured piece 12 and the comparison piece 16 are fixed by clamping the 16 3rd end part 17a from an up-down direction. As described above, the fixing portion 22 holds the measurement piece 12 and the comparison piece 16 side by side, so that the atmospheric conditions of the measurement piece 12 and the comparison piece 16 can be easily controlled. In the present embodiment, the atmospheric condition refers to the wind speed, wind direction, temperature, etc. around the measurement piece 12 and the comparison piece 16.

  The fixing part 22 has a support part 23 and a pressing part 24. In the fixing portion 22, the presser portion 24 has the first end portion 13 a and the first end portion 13 a of the measurement piece 12 and the third end portion 17 a of the comparison piece 16 placed on the upper end surface 23 a of the support portion 23. The third end portion 17a is pressed against the support portion 23 from above, and the presser portion 24 is fixed to the support portion 23 in this state, whereby the first end portion 13a of the measured piece 12 and the first end of the comparison piece 16 are fixed. The three end portions 17a are sandwiched.

  The support portion 23 is placed on a table or fixed to a fixed body. The support part 23 of this embodiment is formed of a heat insulating member.

  The presser portion 24 of the present embodiment includes a presser portion main body 25 formed of a heat conductive material (for example, metal) and a heating element 26 that generates heat when energized. The presser body 25 has a rectangular parallelepiped shape that is long in the vertical direction in FIG. 1, and the heating element 26 has a column shape. The presser portion 24 is configured by fitting the heating element 26 into a hole 25a penetrating the central portion of the presser portion main body 25 in the longitudinal direction. Thereby, the heating element 26 generates heat in a state where the fixing portion 22 sandwiches (holds) the first end portion 13a of the measured piece 12 and the third end portion 17a of the comparison piece 16, so that the heat is transferred to the first end portion. It is transmitted to the portion 13a and the third end portion 17a. That is, the fixing portion 22 of the present embodiment also serves as a heating portion that heats the first end portion 13 a of the measurement target piece 12 and the third end portion 17 a of the comparison piece 16. Fixing screws 27 are disposed at the four corners of the pressing portion 24, and the pressing portion 24 is attached to and detached from the support portion 23 by the fixing screws 27.

  The temperature detection unit 30 includes a first detection unit (measurement piece temperature distribution detection unit) 32 that detects the temperature distribution of the measurement piece 12 and a second detection unit (comparison piece temperature distribution) that detects the temperature distribution of the comparison piece 16. Detection unit) 34.

  The first detection unit 32 extends along the direction from the first end 13a of the measured piece 12 toward the second end 13b that is the end (other end) opposite to the first end 13a. The temperature distribution of the measurement piece 12 is detected, and the second detection portion 34 is a fourth end portion that is an end portion (the other end portion) opposite to the third end portion 17a from the third end portion 17a of the comparison piece 16. The temperature distribution of the comparison piece 16 is detected along the direction toward 17b.

  Each of the first detection unit 32 and the second detection unit 34 includes a plurality of (five in the present embodiment) temperature sensors 36. Each temperature sensor 36 detects the temperature of the part to which the temperature sensor 36 is attached in the measured piece 12 or the comparison piece 16, and outputs a signal corresponding to this temperature. The temperature sensors 36 of the first detection unit 32 according to the present embodiment are arranged in a line with respect to the measurement target piece 12 at an interval from the first end portion 13a of the measurement target piece 12 toward the second end portion 13b. The temperature sensors 36 of the second detection unit 34 are arranged in a line with respect to the comparison piece 16 at intervals from the third end 17a to the fourth end 17b of the comparison piece 16. Placed in. Thereby, the 1st detection part 32 of this embodiment detects intermittent temperature distribution in the to-be-measured piece 12 toward the 2nd end part 13b from the 1st end part 13a. Similarly, the second detection unit 34 of the present embodiment detects an intermittent temperature distribution from the third end 17a toward the fourth end 17b in the comparison piece 16.

Each of these temperature sensors 36 is attached to the surface (main surface portion) 12a, 16a of the measurement piece 12 or the comparison piece 16 by adhesion or the like, but is not limited thereto, and as shown in FIG. And the thickness adjusting thin piece 15 or between the comparative thin pieces (for example, 16a, 16b). Thus, when the temperature sensor 36 is disposed inside the measurement piece 12 or the comparison piece 16, the influence of disturbance is suppressed, thereby improving the temperature detection accuracy of the measurement piece 12 or the comparison piece 16. As a result, the accuracy of the thermal conductivity k ₁ of the measured piece 12 to be obtained is further improved.

  In the present embodiment, a thermocouple is used as the temperature sensor 36, but the present invention is not limited to this, and a sensor having another configuration may be used. The temperature sensor 36 of the present embodiment is a contact type sensor, but may be a non-contact type sensor such as a radiation thermometer.

  The air blowing means 37 controls the atmospheric conditions of the measured piece 12 and the comparative piece 16. In the present embodiment, a blower fan is used as the blower unit 37. The blower fan 37 is configured to be capable of adjusting the wind speed, and is disposed at a position below the measurement piece 12 and the comparison piece 16 held by the fixing portion 22. Specifically, the blower fan 37 is disposed so as to face the main surface (lower surface) of the measured piece 12 and the comparison piece 16, that is, arranged so as to blow toward the lower surface of the measured piece 12 and the comparison piece 16. Has been. Therefore, when the blower fan 37 is driven, wind is supplied from the bottom to the top with respect to the measured piece 12 and the comparison piece 16. Specifically, the blower fan 37 supplies wind from the lower side to the parts other than the parts held by the fixing portions 22 of the measured piece 12 and the comparative piece 16, thereby measuring the measured piece 12 and the comparative piece 16. Controls the wind speed and direction around the. The blower fan 37 of the present embodiment is connected to the arithmetic device 40 and is controlled by the blower control unit 48 of the device 40.

  The rectifying plate 38 makes the air supplied from the blower fan 37 to each part on the lower surface of the measured piece 12 and the air supplied to each part on the lower surface of the comparison piece 16 uniform. Together with the blower fan 37, an atmospheric condition control means for controlling the atmospheric conditions of the measurement piece 12 and the comparison piece 16 is configured.

  The rectifying plate 38 is disposed between the measured piece 12 and the comparison piece 16 that are held by the blower fan 37 and the fixed portion 22. Specifically, the rectifying plate 38 is located between the blower fan 37 and the measured piece 12 and the comparison piece 16 at an intermediate position between the measured piece 12 and the comparison piece 16 held by the blower fan 37 and the fixing portion 22. It is arranged so as to block. In the present embodiment, a metal mesh is used as the rectifying plate 38, and the rectifying plate 38 is disposed along the horizontal direction between the blower fan 37, the measured piece 12, and the comparison piece 16. The rectifying plate 38 and the blower fan 37 are arranged at a distance from each other so that a space is formed between the rectifying plate 38 and the blower fan 37. This space functions as a buffer space. That is, by providing the buffer space, the wind from the blower fan 37 that passes through the rectifying plate 38 and is supplied to the measurement piece 12 and the comparison piece 16 becomes more uniform.

The arithmetic device 40 calculates the heat conduction of the measured piece 12 (and the measured piece main body 14) from each temperature distribution of the measured piece 12 (or the measured piece main body 14) and the comparison piece 16 detected by the measuring unit 20. This is a part for obtaining the rate k ₁ (and k _1a ), and displays the storage unit 42, the calculation unit 50 that performs a predetermined calculation, the input unit 44 for inputting various information, and the calculation result in the calculation unit 50. And a blower control unit 48 for controlling the blower fan 37.

  The storage unit 42 is a part that stores various types of information, and includes a hard disk or the like. The storage unit 42 includes a measurement piece information unit 42 a in which information on the measurement piece 12 is stored, and a comparison piece information unit 42 b in which information on the comparison piece 16 is stored.

Measured piece information unit 42a, each value relating to the shape of the measurement piece 12 (hereinafter, simply referred to as "profile of the measurement piece 12".) And physical properties (for example, the thickness t ₁ of the measurement piece 12 to be Each value necessary for the later-described calculation such as the length L _{1 of the} measurement piece 12, and when the measurement piece 12 is a laminate of the measurement piece main body 14 and the thickness adjusting thin piece 15, the measurement target Values relating to the shape of the measured piece main body 14 such as the thickness t _{1a of the} piece main body 14 and the length L ₁ of the measured piece main body 14, and physical properties (thermal conductivity k _p ) of the respective thickness adjusting thin pieces 15 information of each value) are stored regarding or shape such as the thickness t _p of each thickness adjusting slice 15. When the measured piece 12 is a laminate of the measured piece main body 14 and the thickness adjusting thin piece 15, the measured piece 12 can be obtained from each shape of the measured piece main body 14 and the thickness adjusting thin piece 15. The shape of the measurement piece 12 (for example, the thickness t _{1 of the} measurement piece 12, the length L ₁ of the measurement piece 12, etc.) is the shape of the measurement piece main body 14 input from the input unit 44 and the thickness adjustment thin piece. The calculation result is calculated by the calculation unit 50 from the 15 shapes, and the calculation result is stored in the measured piece information unit 42a.

The comparison piece information section 42b has various values related to the shape of the comparison piece 16 (hereinafter also simply referred to as “the shape of the comparison piece 16”) and physical property values (for example, the thermal conductivity (equivalent thermal conductivity) of the comparison piece k _2. the thickness _{t 2} values, such as the and comparison piece 16, and, the comparison slice 16a constituting the comparison piece 16, 16b, 16c, is ... property value information and the shape) of the stored. The shape of the comparison piece 16 (for example, the thickness t _{2 of the} comparison piece 16 and the length L ₂ of the comparison piece 16) that can be obtained from the shape of each of the comparison thin pieces 16a, 16b, 16c,. Are calculated in the calculation unit 50 from the values relating to the shapes of the respective comparison slices 16a, 16b, 16c,... Inputted from 44, and the calculation results are stored in the comparison piece information unit 42b.

  The arithmetic unit 50 is a so-called computer capable of processing various types of information. A predetermined program is incorporated in the calculation unit 50, and the first calculation unit (comparison piece heat transfer coefficient deriving unit) 52 and the second calculation unit (derivation of measured piece heat conductivity) are functionally executed by executing the program. Part) 54 and an output part 57.

The first calculation unit 52 includes a comparison piece stored in the thermal resistance ratio (first thermal resistance ratio) m ₂ per unit length of the comparison piece 16 and the storage unit 42 (specifically, the comparison piece information unit 42b). The heat transfer of the comparison piece 16 from the physical property value of the heat conductivity (equivalent heat conductivity) k _{2 of} 16 and the shape of the comparison piece 16 and the temperature distribution of the comparison piece 16 detected by the second detection unit 34. The rate h ₂ is obtained.

ここで、Ｔ_０は比較片１６の固定部２２側の根元温度であり、Ｌ_２は、比較片１６の長さである。 Specifically, the first calculation unit 52 is obtained by measuring the temperature rise from the ambient temperature (the temperature in the unheated state) at each position in the longitudinal direction of the comparison piece 16 detected by the second detection unit 34. A curve T (x) approximated to the temperature distribution of the obtained rising temperature is obtained by the least square method, and the fin efficiency φ _exp of the comparison piece 16 is obtained by the following equation (1).

Here, T ₀ is the root temperature on the fixed portion 22 side of the comparison piece 16, and L ₂ is the length of the comparison piece 16.

ここで、Ｔ_Ｌは、比較片１６の先端（第４の端部１７ｂ）の温度である。また、比較片１６の熱抵抗比ｍ_２Ｌ_２は、比較片１６の熱伝導抵抗（第２の熱伝導抵抗）Ｒ_ｃｄ２と、比較片１６の熱伝達抵抗（第２の熱伝達抵抗）Ｒ_ｃｖ２との比に基づく値である。尚、図７に示すように、熱伝導抵抗（第２の熱伝導抵抗）Ｒ_ｃｄ２は、第３端部１７ａから第４端部１７ｂに向って熱が流れるときの抵抗であり、熱伝達抵抗（第２の熱伝達抵抗）Ｒ_ｃｖ２は比較片１６の表面から当該比較片１６の周囲の空間に熱が出るときの抵抗である。これら、熱伝導抵抗Ｒ_ｃｄ２と熱伝達抵抗Ｒ_ｃｖ２とは、以下の式（３）及び式（４）から求めることができる。

ここで、図７に示すように、Ａ_２は比較片１６の断面積であり、Ｓ_２は比較片１６の表面積であり、Ｐ_２は比較片１６の周囲長さ（＝Ｓ_２／Ｌ_２）である。 The first operation unit 52, by comparing the thus determined fin efficiency phi _exp with the following equation (2), determining the thermal resistance ratio m ₂ per unit length of comparison piece 16.

Here, _TL is the temperature of the tip (fourth end 17 b) of the comparison piece 16. Further, the heat resistance ratio m ₂ L ₂ of the comparison piece 16 is equal to the heat conduction resistance (second heat conduction resistance) R _cd2 of the comparison piece 16 and the heat transfer resistance (second heat transfer resistance) R of the comparison piece 16. It is a value based on the ratio with _cv2 . As shown in FIG. 7, the heat conduction resistance (second heat conduction resistance) R _cd2 is a resistance when heat flows from the third end portion 17a toward the fourth end portion 17b, and is a heat transfer resistance. (Second heat transfer resistance) R _cv2 is a resistance when heat is generated from the surface of the comparison piece 16 to the space around the comparison piece 16. These heat conduction resistance R _cd2 and heat transfer resistance R _cv2 can be obtained from the following equations (3) and (4).

Here, as shown in FIG. 7, A ₂ is the cross-sectional area of the comparison piece 16, S ₂ is the surface area of the comparison piece 16, and P ₂ is the peripheral length of the comparison piece 16 (= S ₂ / L ₂ ).

First arithmetic unit 52, the thermal resistance ratio m ₂ per unit length of comparison piece 16 is obtained, the thermal resistance ratio m ₂ per the unit length, compared pieces stored in the comparison piece information unit 42b From the heat conductivity (equivalent heat conductivity) k _{2 of} 16 and the shape, the heat transfer coefficient h ₂ of the comparison piece 16 is calculated by the following equation (5).

The second calculation unit 54 includes a thermal resistance ratio m ₁ per unit length of the measured piece 12, a heat transfer coefficient (calculation heat transfer coefficient) h _{2 of} the comparison piece 16 obtained by the first calculation unit 52, and , The temperature distribution of the measurement piece 12 detected by the first detection unit 32 (specifically, the ambient temperature at each position in the length direction of the measurement piece 12 detected by the first detection unit 32 (in an unheated state) and temperature distribution) of the elevated temperature and elevated temperature obtained by measuring from temperature) to obtain the thermal conductivity k ₁ of the measured pieces 12 from.

ここで、図７に示すように、Ｌ_１は被測定片１２の長さであり、Ａ_１は被測定片１２の断面積であり、Ｓ_１は被測定片１２の表面積であり、Ｐ_１は被測定片１２の周囲長さ（＝Ｓ_１／Ｌ_１）である。また、被測定片１２の熱抵抗比ｍ_１Ｌ_１は、被測定片１２の熱伝導抵抗（第１の熱伝導抵抗）Ｒ_ｃｄ１と、被測定片１２の熱伝達抵抗（第１の熱伝達抵抗）Ｒ_ｃｖ１との比に基づく値である。尚、熱伝導抵抗Ｒ_ｃｄ１は、第１端部１３ａから第２端部１３ｂに向って熱が流れるときの抵抗であり、熱伝達抵抗Ｒ_ｃｖ１は被測定片１２の表面から当該被測定片１２の周囲の空間に熱が出るときの抵抗である。これら熱伝導抵抗Ｒ_ｃｄ１と熱伝達抵抗Ｒ_ｃｖ１とは、式（３）及び式（４）と同様の式から求められる。 Specifically, the second calculation unit 54 includes a first derivation unit 55 and a second derivation unit 56. Here, the thermal resistance ratio m ₁ per unit length of the measured piece 12 is defined by the following equation (6) similar to the thermal resistance ratio m ₂ per unit length of the comparison piece 16.

Here, as shown in FIG. 7, L ₁ is the length of the measured piece 12, A ₁ is the cross-sectional area of the measured piece 12, S ₁ is the surface area of the measured piece 12, and P ₁ Is the peripheral length of the measurement piece 12 (= S ₁ / L ₁ ). Further, the thermal resistance ratio m ₁ L ₁ of the measured piece 12 is equal to the thermal conduction resistance (first thermal conduction resistance) R _cd1 of the measured piece 12 and the heat transfer resistance (first heat transfer) of the measured piece 12. Resistance) A value based on a ratio to R _cv1 . The heat conduction resistance R _cd1 is a resistance when heat flows from the first end 13a to the second end 13b, and the heat transfer resistance R _cv1 is from the surface of the measurement piece 12 to the measurement piece 12. It is the resistance when heat is generated in the space around. The heat conduction resistance R _cd1 and the heat transfer resistance R _cv1 are obtained from the same expressions as the expressions (3) and (4).

The first deriving unit 55 includes the thermal resistance ratio m ₁ per unit length of the measurement target piece 12, the heat transfer coefficient h ₂ of the comparison piece 16 obtained by the first calculation unit 52, and the first detection unit 32. From the detected temperature distribution of the measured piece 12, the thermal conductivity k ₁ of the measured piece 12 is obtained. Specifically, the first deriving unit 55 obtains the fin efficiency φ _exp of the measurement target piece 12 from the temperature distribution of the measurement target piece 12 detected by the first detection unit 32 using Equation (1). Then, the first deriving unit 55 compares the calculated fin efficiency φ _exp with the formula (2), similarly to the first calculation unit 52, to thereby determine the thermal resistance ratio m per unit length of the measurement target piece 12. Find ₁

First derivation unit 55, the thermal resistance ratio m ₁ per unit length of the measurement piece 12 is obtained, the thermal resistance ratio m ₁ per the unit length, compared pieces obtained in the first arithmetic unit 52 16 heat transfer rate (the calculation heat transfer coefficient) h _2, the thermal conductivity of the measurement piece 12 by the shape of the measured pieces 12 that are stored in the measured piece information section 42a, the following equation (7) k ₁ is calculated.

The second derivation unit 56 is configured so that the measured piece 12 is configured by laminating the measured piece main body 14 and one or more thickness adjusting thin pieces 15, that is, information (shape) about the measured piece main body 14. ) if and information about thickness adjusting lamina 15 (physical properties and shape) are stored unit 42 inputs, based on the thermal conductivity k ₁ of the measurement piece 12 obtained by the first derivation unit 55, the The thermal conductivity k _1a of the measurement piece main body 14 is obtained.

Specifically, when the second derivation unit 56 determines that the storage unit 42 (measurement piece information unit 42a) stores the shape of the measurement piece main body 14 and the physical property value and shape of the thickness adjustment thin piece 15. Includes the thermal conductivity k ₁ of the measured piece 12 obtained by the first deriving unit 55, the thickness t ₁ of the measured piece 12 stored in the measured piece information unit 42 a, and the measured piece body From the thickness t _{1a of} 14, the thermal conductivity k _p of the thickness adjustment thin piece 15, and the thickness t _p of the thickness adjustment thin piece 15, the thermal conductivity k of the measured piece main body 14 according to the following equation (8): _1a is calculated.

  In the present embodiment, the second measuring unit 54 (specifically, the second deriving unit 56) determines whether the measured piece 12 is a single unit depending on whether or not the shape of the measured piece main body 14 is stored in the storage unit 42. It is determined whether it is formed of the above-mentioned members or a laminate of the measured piece main body 14 and the thickness adjusting thin piece 15. It may be configured such that the thermal conductivity measuring device 10 determines whether the member is a laminated body.

  The output unit 57 outputs the calculation result in the first derivation unit 55 or the calculation result in the second derivation unit 56 to the display unit 46. Specifically, the output unit 57 is based on the information of the measured piece 12 that is input from the input unit 44 and stored in the storage unit 42, when the measured piece 12 is formed of a single member. When the calculation result of the first deriving unit 55 is output to the display unit 46, while the measured piece 12 is a laminate of the measured piece main body 14 and the thickness adjusting thin piece 15, the second deriving unit 56. Is output to the display unit 46. The output unit 57 calculates the calculation result of the first derivation unit 55 together with the calculation result of the second derivation unit 56 when the measurement piece 12 is a laminate of the measurement piece main body 14 and the thickness adjusting thin piece 15. May be output to the display unit 46.

The input unit 44 includes a keyboard, a touch panel, and the like, and is a part for inputting information on the measurement target piece 12 and the comparison piece 16. Specifically, the input unit 44 inputs information such as the shape and physical property values of the measurement target piece 12 and the comparison piece 16 and stores the information in the storage unit 42. In the present embodiment, the input unit 44 includes the thickness t ₁ of the measured piece 12, the thickness t _1a of the measured piece main body 14, the thermal conductivity k _{p of} the thickness adjusting thin piece 15, and the thickness of the thickness adjusting thin piece 15. The length t _p , the thermal conductivity (equivalent thermal conductivity) k _{2 of} the comparison piece 16, the thickness t ₂ of the comparison piece 16, and the like are input.

The display unit 46 outputs (displays) the thermal conductivity k ₁ (and k _1a ) of the measurement target piece 12 (and the measurement target main body 14) in response to the calculation result of the calculation device 40 (calculation unit 50). The display unit 46 of the present embodiment displays the calculation result on the screen, but may be configured to output (display) by printing or the like.

  The blower control unit 48 controls the blower fan 37 so that wind is supplied to the measured piece 12 and the comparison piece 16 at a predetermined wind speed. Although the air blower control part 48 of this embodiment is provided in the arithmetic unit 40, it is not limited to this, You may provide in another apparatus.

In the thermal conductivity measuring device 10 configured as described above, the thermal conductivity k ₁ (and k _1a ) of the measured piece 12 (and the measured piece main body 14) is measured as follows.

  First, the combination of the comparison thin pieces 16a, 16b,... Constituting the comparison piece 16 is determined.

  Specifically, a measurement piece 12 and a comparison piece 16 in which comparison thin pieces 16a, 16b,... Are arbitrarily combined are prepared, and a temperature sensor is provided at each part for measuring the temperature of the measurement piece 12 and the comparison piece 16. 36 are pasted respectively. Specifically, the temperature sensors 36 are attached so as to be arranged in a line at equal intervals from the one end portions 13a, 17a to the other end portions 13b, 17b in the main surface portions 12a, 16a of the measured piece 12 and the comparison piece 16. The piece 12 to be measured and the comparison piece 16 to which each temperature sensor 36 is attached have the first end 13a of the piece 12 to be measured and the third end 17a of the comparison piece 16 held by the fixing portion 22, thereby Installed in the measurement unit 20. In this state, the first end portion 13a of the measurement piece 12 and the third end portion 17a of the comparison piece 16 are heated by causing the heating element 26 of the fixed portion 22 to generate heat.

  When the measurement target piece 12 and the comparison piece 16 start to be heated, the blower control unit 48 of the arithmetic device 40 drives the blower fan 37 to blow air to the measurement piece 12 and the comparison piece 16. As a result, a portion other than the portion held by the fixing portion 22 in the measured piece 12 and the comparison piece 16, that is, the exposed portion, is supplied with uniform wind in the horizontal direction and is measured under the same atmospheric conditions. The piece 12 and the comparison piece 16 are heated.

  In this state, the first detection unit 32 of the temperature detection unit 30 detects the temperature distribution from the first end 13a to the second end 13b of the measured piece 12, and the second detection unit 34 detects the temperature distribution of the comparison piece 16. A temperature distribution from the third end 17a to the fourth end 17b is detected. Specifically, each temperature sensor 36 of the first detection unit 32 detects the temperature (increased temperature) that is increased from the ambient temperature (the temperature in the unheated state) at the measurement site, whereby the first detection unit 32 is The temperature distribution of the rising temperature from the first end 13a to the second end 13b of the measured piece 12 is detected. Similarly, when each temperature sensor 36 of the second detection unit 34 detects the temperature (increased temperature) that is increased from the ambient temperature (temperature in a state of not being heated) at the measurement site, the second detection unit 34 is The temperature distribution of the rising temperature from the third end 17a to the fourth end 17b of the comparison piece 16 is detected.

At this time, when the thermal gradient of the temperature distribution of the comparative piece 16 and the thermal gradient of the temperature distribution of the measurement piece 12 are significantly different, since the error of the thermal conductivity k ₁ of the measurement piece 12 is increased to obtain, compared piece 16 The combination of the comparative thin pieces 16a, 16b,. Specifically, from the equivalent thermal conductivity (see FIG. 5 and Table 1) in various combinations obtained in advance as described above, the temperature distribution is close to the temperature distribution of the measurement target piece 12 (in detail, The combination is selected so that the temperature difference between the measured piece 12 and the comparison piece 16 at each position in the longitudinal direction is equal to or less than a predetermined value, and the combination of the comparison thin pieces constituting the comparison piece 16 is determined.

  When the combination of the comparison thin pieces 16a, 16b,... Constituting the comparison piece 16 is changed, each of the temperature sensors attached to the comparison piece 16 from the comparison piece 16 is removed from the measurement unit 20. 36 is removed. And after the temperature sensor 36 is each attached to each temperature measurement position of the comparison piece 16 after changing a combination, the comparison piece 16 is installed in the measurement part 20. FIG.

On the other hand, information regarding the measurement piece 12 and information regarding the comparison piece 16 are input from the input unit 44 to the arithmetic device 40. Specifically, the shape of the piece 12 to be measured (for example, the length L ₁ of the piece 12 to be measured, the cross-sectional area A ₁ of the piece 12 to be measured, and the length P ₁ around the piece 12 to be measured (= S ₁ / L ₁ ) etc. is input from the input unit 44 and stored in the measured piece information unit 42 a of the storage unit 42.

When the measured piece 12 is a laminate of the measured piece main body 14 and the thickness adjusting thin piece 15, the shape of the measured piece main body 14 and the physical property value and shape of the thickness adjusting thin piece 15 are input from the input unit 44. And stored in the measured piece information section 42a. At this time, the shape of the measured piece 12 (for example, the thickness t ₁ of the measured piece 12 etc.) that can be obtained by calculation from the shapes of the measured piece main body 14 and the thickness adjusting thin piece 15 is input as described above. The shape of the measured piece main body 14 and the shape of the thickness adjusting thin piece 15 are calculated and stored in the measured piece information section 42a.

Further, the thermal conductivity (equivalent thermal conductivity) k _{2 of} the comparison piece 16, the length L ₂ of the comparison piece 16, the cross-sectional area A ₂ of the comparison piece 16, and the length P ₂ around the comparison piece 16 (= S ₂ / L ₂ ) is input from the input unit 44 and stored in the comparison piece information unit 42 b of the storage unit 42.

  Next, when the combination of the comparison piece 16 is determined and the comparison piece 16 and the measurement piece 12 are installed in the measurement unit 20, the first end portion 13 a of the measurement piece 12 and the comparison piece are fixed by the fixing unit 22. Sixteen third end portions 17a are heated. At this time, similarly to the above, the blower control unit 48 controls the blower fan 37 to blow air to the measured piece 12 and the comparison piece 16. The temperature detection unit 30 detects the temperature distribution of the measurement piece 12 and the temperature distribution of the comparison piece 16.

As described above, when the temperature distribution of the measurement piece 12 and the comparison piece 16 is detected in a state where the shape and the property values of the measurement piece 12 and the comparison piece 16 are stored in the storage unit 42, the first calculation unit 52. _Calculates the fin efficiency φ _exp of the comparison piece 16 from the temperature distribution of the comparison piece 16 detected by the second detection unit 34 and the equation (1), and the fin efficiency φ _exp of the comparison piece 16 from the fin efficiency φ _exp and the equation (2). The thermal resistance ratio m ₂ per unit length is obtained. The first operation unit 52, compares the equation (5) based on the thermal resistance ratio m ₂ per unit length thus determined and the thermal conductivity k ₂ of the comparative pieces 16 stored in the storage unit 42 calculating a heat transfer coefficient _{h 2} pieces 16.

When the first calculation unit 52 calculates the heat transfer coefficient h ₂ of the comparison piece 16, the first derivation unit 55 of the second calculation unit 54 calculates the temperature distribution of the measured piece 12 detected by the first detection unit 32 and the equation ( 1), the fin efficiency φ _exp of the measured piece 12 is obtained, and the thermal resistance ratio m ₁ per unit length of the measured piece 12 is obtained from the fin efficiency φ _exp and the expression (2). First derivation unit 55, the thermal resistance ratio m ₁ per unit length of the measured strip 12 is obtained, compared pieces with thermal resistance ratio m ₁ per the unit length is first arithmetic unit 52 calculated 16 The thermal conductivity k ₁ of the piece 12 to be measured is calculated from the equation (7) using the heat transfer coefficient h ₂ .

When the measured piece 12 is composed of a single member, when the first derivation unit 55 obtains the thermal conductivity k ₁ of the measured piece 12, the output unit 57 displays the calculation result on the display unit 46. Output. The display unit 46 displays the calculation result sent from the output unit 57.

On the other hand, when the measured piece 12 is configured by laminating the measured piece main body 14 and the thickness adjusting thin piece 15, the second derivation unit 56 performs further calculation to calculate the heat of the measured piece main body 14. The conductivity k _1a is derived. Specifically, in the second deriving unit 56, the measured piece 12 is configured by the measured piece main body 14 and the thickness adjusting thin piece 15 based on the information stored in the measured piece information unit 42 a of the storage unit 42. If it is determined, the thermal conductivity k ₁ of the measured piece 12 obtained by the first deriving unit 55, the thickness t ₁ of the measured piece 12 stored in the measured piece information section 42a, and the measured value the thickness _{t 1a} pieces body 14, calculates the thermal conductivity _{k 1a} of the measured element body 14 from the equation (8) using a thermal conductivity _{k p} and the thickness _{t p} of the thickness adjusting slice 15.

When the calculation is performed by the second derivation unit 56, the output unit 57 outputs the calculation result of the second derivation unit 56 (the thermal conductivity k _1a of the measured piece main body 14) to the display unit 46. At this time, the output unit 57 outputs the calculation result of the second deriving unit 56 (the thermal conductivity k _1a of the measured piece main body 14) together with the calculation result of the first deriving unit 55 (the thermal conductivity k ₁ of the measured piece 12). It may be configured to output to the display unit 46. Then, the display unit 46, (the thermal conductivity k _1a of the measured piece body _14, the thermal conductivity k ₁ of the measurement piece ₁₂₎ calculation result sent from the output unit 57 displays the like.

As described above, according to the thermal conductivity measuring device 10 of the first embodiment, the heat transfer coefficient h ₂ of the comparison piece 16 obtained using the comparison piece 16 having the known thermal conductivity k ₂ is calculated. By using this as the heat transfer coefficient for the operation, it is not necessary to calculate the heat transfer coefficient h ₁ of the measured piece 12 by calculation using a calculation formula such as a natural convection formula or a radiation formula for the plate-shaped measured piece arranged vertically. The thermal conductivity k ₁ of the measured piece 12 can be obtained.

Specifically, if the heat transfer coefficient h ₁ of the measured piece 12 and the thermal resistance ratio m ₁ per unit length of the measured piece 12 obtained from the temperature distribution of the measured piece 12 are known, these are used. Thus, the thermal conductivity k ₁ of the measured piece 12 can be obtained. Therefore, the thermal conductivity k ₂ by using a known comparison piece 16, determine the heat transfer coefficient h ₂ of the comparison piece 16 and a thermal conductivity k ₂ and the temperature distribution of the comparative piece 16, the heat transfer coefficient ( By imitating the heat transfer coefficient for calculation (h ₂ ) with the heat transfer coefficient h _{1 of the} measured piece 12, the thermal conductivity k of the measured piece 12 is calculated from the heat transfer coefficient h ₂ and the temperature distribution of the measured piece 12. ₁ can be obtained.

Thus, according to the thermal conductivity measuring apparatus 10 of the present embodiment, the heat transfer coefficient h ₂ of the comparison piece 16 obtained from the comparison piece 16 having the known thermal conductivity k ₂ is used as the heat transfer of the measurement piece 12. By imitating the rate h ₁ , it is possible to derive the thermal conductivity k ₁ of the measured piece 12 without performing a calculation using a natural convection type or a radiation type for the plate-like measured piece arranged vertically. . That is, according to the thermal conductivity measuring device 10 can without vertical arrangement to be measured piece 12 obtains a thermal conductivity k ₁ of the measured pieces 12.

Moreover, the heat transfer coefficient h ₁ of the measurement piece 12 which is a coefficient for handling heat transfer between the measurement piece 12 and the space around the measurement piece 12 (more specifically, heat transfer of the measurement piece 12 Since the heat conductivity k ₁ of the measurement piece 12 is obtained using the heat transfer coefficient h ₂ ) of the comparison piece 16 assumed as the rate h ₁ , the calculation result shows the heat radiation from the measurement piece 12 to the surrounding space. As a result, the thermal conductivity k ₁ of the measurement piece 12 can be obtained without placing the measurement piece 12 in a vacuum and bringing it into a vacuum insulation state.

Further, in the thermal conductivity measuring apparatus 10 according to the first embodiment, the atmospheric condition around the measurement piece 12 and the atmospheric condition around the comparison piece 16 are changed to atmospheric control means (in this embodiment, the blower fan 37 and the rectifying plate 38. ), It is possible to detect the temperature distribution of the measurement piece 12 and the temperature distribution of the comparison piece 16 under the same atmospheric conditions. Thus, the thermal conductivity k ₁ of the measurement piece 12 obtained by using the heat transfer coefficient h ₂ of the comparative piece 16, the difference in atmospheric conditions when measuring the temperature distribution of the measurement piece 12 and Comparative piece 16 The influence based on can be excluded. That is, the influence based on the difference in the atmospheric condition in the calculation when calculating the thermal conductivity k ₁ of the measured piece 12 using the heat transfer coefficient h ₂ of the comparison piece 16 is eliminated, and the thermal conductivity of the measured piece 12 is calculated. k ₁ can be obtained more accurately.

  Further, in the thermal conductivity measuring apparatus 10 according to the first embodiment, the air flow to the measurement piece 12 and the comparison piece 16 is adjusted by the blower fan (blower unit) 37 to surround the measurement piece 12 and the comparison piece 16. By making the wind speeds (ambient wind speeds) equal to each other, the temperature distribution of the measured piece 12 and the comparison piece 16 can be detected under the same atmospheric conditions.

In addition, when detecting the temperature distribution of the measurement piece 12 or the comparison piece 16 having a large thermal conductivity k, the surrounding wind speed of the measurement piece 12 or the comparison piece 16 is increased to increase the temperature from the one end 13a or 17a. end 13b, it is possible to increase the temperature gradient of the heat flows toward the 17b, this makes it possible to obtain good thermal conductivity k ₁ of the measurement piece 12 accuracy. That is, if the thermal conductivity k ₁ , k _{2 of the} measurement piece 12 or the comparison piece 16 is large and the temperature gradient of the temperature distribution in the direction from the one end portion 13a, 17a to the other end portion 13b, 17b is small, the measurement piece 12 since the error in the calculation result is larger when calculated using the temperature distribution in and comparative pieces 16, the error of thermal conductivity k ₁ of the measurement piece 12 obtained increases. Therefore, the air velocity around the measured piece 12 and the comparison piece 16 is increased by the blower fan 37 to increase the temperature gradient of the temperature distribution in the direction from the one end portion 13a, 17a to the other end portion 13b, 17b. By making the temperature gradient suitable for calculation (that is, the error of the calculation result does not increase), the error can be suppressed.

Further, in the thermal conductivity measuring apparatus 10 according to the first embodiment, the rectifying plate 38 can make uniform the wind speed from the blower fan 37 to each part of the measured piece 12 and the comparative piece 16, thereby measuring the measured value. It is possible to prevent the heat transfer coefficients h ₁ and h _{2 from} partially changing in the piece 12 and the comparison piece 16. As a result, it is possible to determine more accurately the thermal conductivity k ₁ of the measurement piece 12.

Further, in the thermal conductivity measuring device 10 according to the first embodiment, since the second calculation unit 54 includes the first derivation unit 55 and the second derivation unit 56, the thin measured piece body 14 or the thermal conductivity k _1a. Even if the measured piece main body 14 is small, the measured piece main body 14 and the thickness adjusting thin piece 15 are laminated to form the measured piece 12, thereby _obtaining the thermal conductivity k _1a of the measured piece main body 14. be able to. That is, by stacking the measured piece main body 14 and the thickness adjusting thin piece 15 and increasing the cross-sectional area through which the heat flow from the one end portion 13a to the other end portion 13b passes, the one end portion 13a is directed to the other end portion 13b. Thus, the temperature gradient of the flowing heat can be set to a size suitable for calculation, whereby the thermal conductivity k _1a of the measurement target main body 14 which is thin or has a small thermal conductivity can be obtained.

Further, by using the thickness adjusting thin piece 15, if there is one measured piece main body 14, the thermal conductivity k _1a of the measured piece main body 14 can be obtained.

  In the thermal conductivity measuring device 10 according to the first embodiment, the fixing part for fixing the measurement piece 12 and the fixing part for fixing the comparison piece 16 are configured by a common fixing member (supporting part 23 and pressing part 24). By doing so, the configuration of the thermal conductivity measuring device 10 can be simplified as compared with the case where the fixing portion of the measurement piece 12 and the fixing portion of the comparison piece 16 are configured separately. Moreover, by arranging and fixing the measured piece 12 and the comparative piece 16 side by side, it becomes easy to control the atmospheric conditions of the measured piece 12 and the comparative piece 16 and the temperature distribution between the measured piece 12 and the comparative piece 16. Can be measured simultaneously.

<Second Embodiment>
FIG. 8 is a plan view schematically showing a structure in which the measurement piece and the comparison piece are installed in the thermal conductivity measurement apparatus according to the second embodiment of the present invention, and FIG. 9 is shown in FIG. It is the front view which showed roughly the structure of the heat conductivity measuring apparatus.

  Next, the configuration of the thermal conductivity measuring apparatus 10a according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9, and the same reference numerals are used for the same configurations as in the first embodiment. Detailed description will be omitted, and only different configurations will be described in detail.

  Unlike the thermal conductivity measurement device 10 according to the first embodiment, the thermal conductivity measurement device 10a according to the second embodiment differs from the boundary condition on the second end side end surface of the measurement target piece 12 and the first of the comparison piece 16. The heat insulation part 60 for making the boundary condition in a 4 end part side end surface into a heat insulation condition is provided.

  Specifically, the thermal conductivity measurement device 10 a according to the present embodiment includes a measurement unit 20 and a calculation device 40. The measuring unit 20 includes a fixed unit 22, a heat insulating unit 60, a temperature detecting unit 30, a blower fan 37, and a current plate 38.

  The heat insulating portion 60 is formed of a material having heat insulating properties, and when the measured piece 12 and the comparison piece 16 are held by the fixing portion 22, an end face (second surface) of the measured piece 12 on the second end portion 13 b side. This is a member that comes into contact with the end face on the second end side) and the end face on the fourth end 17b side of the comparison piece 16 (end face on the fourth end side). In this way, by contacting the end face on the second end side of the measured piece 12 and the end face on the fourth end side of the comparison piece 16, the heat insulating part 60 can meet the boundary condition between the end face on the second end side and the fourth end. The boundary condition of the part side end face is set as the heat insulation condition.

  The computing device 40 includes a storage unit 42, a computing unit 50, an input unit 44, a display unit 46, and a blower control unit 48. The computing unit 50 includes a first computing unit 52a, a second computing unit 54, and an output unit. 57.

The first calculation unit 52a includes a thermal resistance ratio m ₂ per unit length of the comparison piece 16, a thermal conductivity (equivalent thermal conductivity) k _{2 of the} comparison piece 16 stored in the comparison piece information unit 42b, and the temperature distribution of the comparative piece 16 detected by the second detection unit 34, the shape of the comparison pieces 16 stored in the comparison piece information unit 42b, obtains the heat transfer coefficient h ₂ of the comparison pieces 16.

Specifically, unlike the first embodiment, the first calculation unit 52a of the present embodiment is a comparison detected by the second detection unit 34 in a state where the boundary condition of the end surface on the fourth end side is an adiabatic condition. The fin efficiency φ _exp of the comparison piece 16 is obtained from the temperature distribution of the piece 16 and the equation (1). The first calculation unit 52a by comparing the expression follows the fin efficiency phi _exp (9), determining the thermal resistance ratio m ₂ per unit length of comparison piece 16.

When the thermal resistance ratio m ₂ per unit length of the comparison piece 16 is obtained, the first calculation unit 52a determines the thermal resistance ratio m ₂ per unit length and the comparison piece information unit as in the first embodiment. the thermal conductivity of the comparative pieces 16 stored in the 42b by using the (equivalent thermal conductivity) k ₂ and shaped to calculate the heat transfer coefficient h ₂ of the comparative piece 16 from equation (5).

The second calculation unit 54 includes a first derivation unit 55 a and a second derivation unit 56. The first deriving unit 55a obtains the fin efficiency φ _exp of the measurement target piece 12 from the temperature distribution of the measurement target piece 12 detected by the first detection unit 32 according to the equation (1), and similarly to the first calculation unit 52a, By comparing the fin efficiency φ _exp and the equation (9), the thermal resistance ratio m ₁ per unit length of the measured piece 12 is obtained.

The first derivation unit 55a, when the thermal resistance ratio m ₁ per unit length of the measurement piece 12 is obtained, the thermal resistance ratio m ₁ per the unit length was determined by first computing section 52a compares a heat transfer coefficient h ₂ pieces 16, and a profile of the measurement piece 12 stored in the measured piece information section 42a, calculates the thermal conductivity k ₁ of the measurement piece 12 by equation (7).

In thus configured thermal conductivity measuring device 10a, the expression (9) instead of equation (2) when determining the thermal resistance ratio m ₂ of the comparative piece 16 per unit length in the first arithmetic unit 52a The first embodiment is used except that the equation (9) is used instead of the equation (2) when the thermal resistance ratio m ₁ of the measured piece 12 per unit length is obtained in the first derivation unit 55a. The thermal conductivity k ₁ (k _1a ) of the measured piece 12 (measured piece main body 14) is obtained in the same manner as the thermal conductivity measuring apparatus 10 of FIG.

As described above, by the thermal conductivity measuring apparatus 10a of the second embodiment, like the first embodiment, the thermal conductivity k ₂ is determined using known comparison piece 16 of the comparison piece 16 by using the heat transfer coefficient h _2, even without calculating the heat transfer coefficient of the measured pieces by a calculation using a formula such as natural convection and radiant against the plate to be measured pieces of vertical arrangement, the it can be obtained a thermal conductivity k ₁ of the measurement piece 12. Moreover, the heat transfer coefficient h ₁ of the measurement piece 12 which is a coefficient for handling heat transfer between the measurement piece 12 and the space around the measurement piece 12 (more specifically, heat transfer of the measurement piece 12 Since the heat conductivity k ₁ of the measurement piece 12 is obtained using the heat transfer coefficient h ₂ ) of the comparison piece 16 assumed as the rate h ₁ , the calculation result shows the heat radiation from the measurement piece 12 to the surrounding space. As a result, the thermal conductivity k ₁ of the measurement piece 12 can be obtained without placing the measurement piece 12 in a vacuum and bringing it into a vacuum insulation state.

<Third embodiment>
FIG. 10 (A) is a front view schematically showing the structure in a state in which the measurement piece and the comparison piece are installed in the thermal conductivity measurement device according to the third embodiment of the present invention and the heat insulating member is removed, FIG. 10B is a view showing a state where a heat insulating member is installed in the thermal conductivity measuring device shown in FIG. 10A, and FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. These are the top views which showed roughly the structure of the temperature sensor part in the thermal conductivity measuring apparatus of 3rd Embodiment.

  Next, the configuration of the thermal conductivity measuring device 10b according to the third embodiment of the present invention will be described with reference to FIGS. 10A to 12, but the same as in the first and second embodiments. The same reference numerals are used for the configurations, and detailed description is omitted, and only different configurations will be described in detail.

  The thermal conductivity measurement device 10b according to the third embodiment includes a measurement unit 20a and a calculation device 40. Here, since the arithmetic device 40 of this embodiment is the same structure as the arithmetic device 40 of 2nd Embodiment, description is abbreviate | omitted.

  The measuring unit 20a is based on the atmospheric conditions of the fixing unit 22a, the heat insulating unit 60, the temperature detecting unit 30a, the temperature sensor supporting unit 70 that supports the temperature detecting unit 30a, and the measured piece 12 and the comparison piece 16. A heat insulating member 72, a blower fan 37, and a current plate 38. Unlike the first and second embodiments, the fixing portion 22a is configured such that when the measurement piece 12 and the comparison piece 16 are held, the support portion 23 is located on the upper side and the presser portion 24 is located on the lower side. Composed. That is, in the fixing portion 22a, the support portion 23 and the pressing portion 24 are disposed upside down with respect to the fixing portion 22 of the first embodiment and the second embodiment.

  The temperature detection unit 30a includes a first detection unit 32a and a second detection unit 34a. Unlike the first and second embodiments, the first detection unit 32 a and the second detection unit 34 a can install the temperature sensor 36 at a time for each temperature measurement portion of the measured piece 12 and the comparison piece 16. Configured as follows. Specifically, the first detection unit 32a and the second detection unit 34a each include a plurality of (five in the present embodiment) temperature sensors 36 and an arrangement plate member 35 on which the plurality of temperature sensors 36 are arranged. (See FIG. 12).

  The disposing plate member 35 is a plate-like member, and a plurality of temperature sensors 36 are disposed so as to be arranged in a line at intervals on the main surface portion 35a. The arrangement of the temperature sensor 36 on the main surface portion 35a is obtained when the arrangement plate 35 of the first detection unit 32a (second detection unit 34a) is overlapped on the measurement piece 12 (comparison piece 16) in order to detect the temperature distribution. Moreover, it corresponds to each temperature measurement site | part of the said to-be-measured piece 12 (the said comparison piece 16). The arranging plate material 35 is made of a resin having a small thermal conductivity k. By forming the placement plate 35 with such a resin, it is possible to suppress the influence of the heat flow from the placement plate 35 when measuring the temperature distribution of the measured piece 12 and the comparison piece 16.

  By attaching the first detection unit 32a (second detection unit 34a) configured in this way to the measurement piece 12 (comparison piece 16), the temperature sensor 36 is provided for each temperature measurement portion of the measurement piece 12. Each is placed. Specifically, the first detection unit 32a (second detection unit 34a) is arranged between the arrangement plate 35 of the first detection unit 32a (second detection unit 34a) and the measured piece 12 (comparison piece 16). The placement plate 35 and the measurement piece 12 (comparison piece 16) are overlapped so that the temperature sensors 36 arranged on the main surface portion 35a are sandwiched. At this time, the first detection unit 32a (second detection unit 34a) and the measurement target piece 12 (comparison piece 16) are bonded by a double-sided tape or the like. By attaching the first detection unit 32a (second detection unit 34a) to the measured piece 12 (comparison piece 16) in this way, a plurality of temperature sensors 36 are provided at the temperature measurement position of the measured piece 12 (comparative piece 16). Are placed at once.

  The temperature sensor support unit 70 is a member that supports the first detection unit 32a and the second detection unit 34a from the lower side, and is formed of a heat insulating material. The temperature sensor support unit 70 is provided on each piece 12 to be measured 12 (comparison piece 16) held by the fixing unit 22a, and each temperature sensor 36 of the placement plate 35 of the first detection unit 32a (second detection unit 34a). The placement plate 35 is supported from the lower side so as to be closely attached.

The heat insulating member 72 covers the periphery of the measurement piece 12 and the comparison piece 16 so as to be in a heat insulation state, and is detachable from the measurement piece 12 and the comparison piece 16. This heat insulation member 72 is normally removed from the measurement part 20a (refer FIG. 10 (A)). Then, the thermal conductivity k ₁ of the measured piece 12 is small, and if the temperature distribution is detected as it is, the temperature gradient becomes too large, and if the calculation is performed using this temperature distribution, the error of the calculation result becomes large. In the case of the piece 12, the heat insulating member 72 is attached to the measured piece 12 and the comparative piece 16 (see FIG. 10B), and puts the measured piece 12 and the comparative piece 16 in a thermally insulated state. When the measurement piece 12 and the comparison piece 16 are in a heat insulation state by the heat insulating member 72 in this manner, heat does not escape from the measurement piece 12 and the comparison piece 16 to the outside, and the temperature gradient becomes small. And the temperature distribution detected from the comparison piece 16 becomes a temperature gradient suitable for calculation.

  The heat insulating member 72 of the present embodiment is attached so as to cover the upper surface side exposed in the atmosphere in the measured piece 12 and the comparative piece 16 held in the fixing portion 22a, so that the measured piece 12 and the comparative piece 16 are compared. The piece 16 is insulative. Note that the heat insulating member 72 of the present embodiment includes the first detection unit 32a, the second detection unit 34a, and the temperature sensor support unit 70 below the measured piece 12 and the comparison piece 16, and therefore, in the atmosphere. Although it has a shape that covers the exposed upper surface side of the measurement piece 12 and the comparison piece 16, it is held by the fixing portion 22 of the measurement piece 12 and the comparison piece 16 as in the first and second embodiments. When a part other than the exposed part is exposed to the atmosphere, the part is configured to cover the entire exposed part.

  Unlike the first embodiment and the second embodiment, the blower fan 37 is disposed above the measurement target piece 12 and the comparison piece 16 that are held by the fixing portion 22a. As a result, the blower fan 37 supplies air to the measured piece 12 and the comparison piece 16 from above to below.

  The rectifying plate 38 makes the air supplied from the blower fan 37 to each part on the upper surface of the measured piece 12 and the air supplied to each part on the upper surface of the comparison piece 16 uniform. The rectifying plate 38 is disposed between the measured piece 12 and the comparison piece 16 that are held by the blower fan 37 and the fixed portion 22a.

In the thermal conductivity measuring device 10b configured as described above, the placement plate members 35 of the first detection unit 32a and the second detection unit 34a are attached to the measurement piece 12 and the comparison piece 16, and the attached object to be attached. The measurement piece 12 and the comparison piece 16 are held by the fixing portion 22a and are disposed on the temperature sensor support portion 70 (see FIG. 10A). As described above, when the measurement piece 12 and the comparison piece 16 are installed in the measurement unit 20a, the first end portion 13a of the measurement piece 12 and the third end portion 17a of the comparison piece 16 are heated by the fixing portion 22a. The blower fan 37 starts blowing air to the measured piece 12 and the comparison piece 16. Then, a thermal conductivity _k 1 of the arithmetic unit 40 in the same manner as in the second embodiment to be measured pieces 12 (the measured element body 14) _{(k 1a).}

On the other hand, the thermal conductivity k ₁ of the measured piece 12 is small, and if the temperature distribution is detected as it is, the temperature gradient becomes too large, and if the calculation is performed using this temperature distribution, the error of the calculation result becomes large. In the case of the piece 12, the heat insulating member 72 is attached to the measured piece 12 and the comparison piece 16 without driving the blower fan 37 (the state shown in FIG. 10B). Specifically, the measurement piece 12 and the comparison piece 16 in which the first detection unit 32a and the second detection unit 34a are attached on the temperature sensor support unit 70 are arranged from above the measurement piece. A heat insulating member 72 is placed so as to cover 12 and the comparison piece 16. This by the fixing portion 22a in a state to be measured pieces 12 and Comparative piece 16 is heated, as in the second embodiment, the thermal conductivity k ₁ of the measurement piece 12 is measured. In this way, by making the measured piece 12 and the comparison piece 16 in a heat-insulated state by the heat insulating member 72, heat does not escape to the outside, the temperature gradient becomes smaller, and the temperature distribution detected from the measured piece 12 and the comparison piece 16. Can be a temperature gradient suitable for calculation.

  The thermal conductivity measuring device, the thermal conductivity calculating device, the thermal conductivity calculating program, and the thermal conductivity measuring method of the present invention are not limited to the first to third embodiments, but Of course, various modifications can be made without departing from the scope of the invention.

The specific configuration for obtaining the thermal resistance ratio m ₁ (m ₂ ) per unit length from the temperature distribution of the measured piece 12 (comparative piece 16) is not limited. In the first derivation unit 55 (first arithmetic unit 52) of the first embodiment, the fin efficiency φ _exp is obtained from the temperature distribution of the measured piece 12 (comparison piece 16) by the equation (1), and this fin efficiency φ The thermal resistance ratio m ₁ (m ₂ ) per unit length is obtained from _exp and the expression (2). In the first derivation unit 55a (the first calculation unit 52a) of the second embodiment, the measured piece 12 The fin efficiency φ _exp is obtained from the temperature distribution of the (comparative piece 16) by the equation (1), and the thermal resistance ratio m ₁ (m ₂ ) per unit length is obtained from the fin efficiency φ _exp and the equation (9). However, for example, the thermal resistance ratio m ₁ (m ₂ ) per unit length may be obtained by the following method or the like.

ここで、Ｔ_０は被測定片１２（比較片１６）の根元（第１端部１３ａ（第３端部１７ａ））温度であり、Ｔ_Ｌは先端（第２端部１３ｂ（第４端部１７ｂ））の温度であり、ｘは根元からの距離である。 In this method, when the temperature at both ends of the measured piece 12 (comparison piece 16) is used (fixed temperature at both ends), the fin temperature represented by the following formula (10-1) (formula (10-2)) It is obtained from the distribution analysis formula. Specifically, each temperature measurement of the measured piece 12 (comparative piece 16) actually measured (detected) by the temperature detection unit 30 and the temperature of each temperature measurement portion in the expression (10-1) (expression (10-2)). The thermal resistance ratio m ₁ (m ₂ ) per unit length that minimizes the standard deviation σ from the temperature of the part is obtained.

Here, T ₀ is the base (first end 13a (third end 17a)) temperature of the measured piece 12 (comparison piece 16), and _TL is the tip (second end 13b (fourth end). 17b)), and x is the distance from the root.

ここで、ｎは測定点の数であり、ｉは各測定点（即ち、各温度測定部位）に被測定片１２（比較片１６）の根元側から先端に向かって順に番号をふったときの測定点の位置を示す番号である。 The standard deviation σ is defined by the following equation (11).

Here, n is the number of measurement points, and i is the number when each measurement point (that is, each temperature measurement site) is numbered sequentially from the root side of the measurement target piece 12 (comparison piece 16) toward the tip. It is a number indicating the position of the measurement point.

In addition, said method is a method when the end surface on the opposite side to the heating side of the to-be-measured piece 12 (comparison piece 16) is not heat insulation conditions like 1st Embodiment, Comprising: It is to be measured like 2nd Embodiment. When the end surface opposite to the heating side of the piece 12 (comparison piece 16) is in a heat insulating condition, the thermal resistance ratio m ₁ (m ₂ ) per unit length is obtained as follows. In this case, unlike the above method, the fin temperature distribution in which the temperature of each temperature measurement portion of the measured piece 12 and the comparison piece 16 is represented by the following formula (12-1) (formula (12-2)) Calculated by analytical formula. Similarly to the above method, the thermal resistance ratio m ₁ (m ₂ ) per unit length that minimizes the standard deviation σ is obtained.

  The first detectors 32 and 32a (second detectors 34 and 34a) of the first to third embodiments are the first end 13a (third end 17a) of the measured piece 12 (comparison piece 16). ) To the second end portion 13b (fourth end portion 17b) is intermittently detected. However, the present invention is not limited to this, and the temperature may be continuously detected.

  For example, the temperature detection unit may be configured to measure the temperature of the measurement target piece 12 (comparison piece 16) while moving a temperature sensor such as an infrared sensor. Specifically, as shown in FIG. 13, the temperature detection unit 130 includes a temperature sensor 136 that detects the temperature of the measurement target piece 12 (comparison piece 16), and the temperature sensor 136 is used as the measurement piece 12 (comparison piece 16). Moving means 62 for moving along the direction from the first end portion 13a (third end portion 17a) to the second end portion 13b (fourth end portion 17b).

  In FIG. 13, the temperature sensor 136 is a radiation thermometer such as an infrared sensor, but is not limited to this. The temperature sensor 136 can detect the temperature of the measurement piece 12 (comparison piece 16) and can be used as the measurement piece 12 (comparison piece 16). As long as it can be moved along, it may be a contact type temperature sensor or a non-contact type temperature sensor other than a radiation thermometer.

  The moving means 62 moves the temperature sensor 136 along the direction from the first end 13a (third end 17a) to the second end 13b (fourth end 17b) of the measured piece 12 (comparison piece 16). A guide member 63 for guiding and a drive unit 64 for reciprocating the temperature sensor 136 along the guide member 63 are provided. The guide member 63 is a direction from the first end 13a (third end 17a) to the second end 13b (fourth end 17b) of the measurement target piece 12 (comparison piece 16) held by the fixed portion 22. A temperature sensor 136 is attached so as to be reciprocally movable in this direction.

According to such a temperature detection unit 130, there is no need to attach the plurality of thermocouples 36 to the measurement target piece 12 or the comparison piece 16 as in the first and second embodiments. Moreover, according to this temperature detection part 130, since the continuous temperature distribution in the to-be-measured piece 12 and the comparison piece 16 can be detected, compared with the case where an intermittent temperature distribution is detected, thermal conductivity measuring apparatus it is possible to improve the measurement accuracy of the thermal conductivity k ₁ of the measurement piece 12 at.

  Note that the temperature detection unit 130 including the temperature sensor 136 and the moving unit 62 includes a first end portion 13a (third end portion 17a) to a second end portion 13b (third end portion 17a) of the measurement target piece 12 (comparison piece 16). In addition to continuously detecting the temperature up to the fourth end portion 17b), the temperature may be detected intermittently (for example, positions x = 0, x1, x2, and L in FIG. 13).

Further, as shown in FIG. 14, the temperature detection unit, for example, from a heated portion in the measurement target piece 12 (comparison piece 16) such as an infrared camera to the second end portion 13b (fourth end portion 17b). The structure which can measure the whole temperature of this simultaneously may be sufficient. Even when the temperature detection unit 130a is used, there is no need to stick the plurality of temperature sensors 36 to the measurement piece 12 or the comparison piece 16 as in the first and second embodiments. Further, since the detectable continuous temperature distribution in the measurement piece 12 and Comparative piece 16, it is possible to improve the measurement accuracy of the thermal conductivity k ₁ of the measurement piece 12.

ここで、ｔ_ａｌｌは、被測定片１２の厚さｔ_１と、この被測定片１２の両面にそれぞれ貼り付けられた黒色テープの厚さｔ_３とを合わせた厚さである。即ち、ｔ_ａｌｌ＝ｔ_１＋２ｔ_３である。 The surfaces of the measured piece 12 and the comparison piece 16 may be blackened by painting or the like. In this case, as shown in FIGS. 13 and 14, a black tape 74 whose emissivity and thermal conductivity k are known may be attached to the surfaces of the measurement target piece 12 and the comparison piece 16. Thereby, it becomes easy to make the surface of the to-be-measured piece 12 and the comparison piece 16 black, compared with the case where the surface is made black by painting. When the measured piece 12 to which the black tape 74 is attached is used, the obtained thermal conductivity k becomes the equivalent thermal conductivity between the measured piece 12 and the black tape 74, and the emissivity of the black tape 74 is Since the thermal conductivity k ₃ and the thickness t ₃ are known, the thermal conductivity k ₁ of the measured piece 12 can be obtained from the following equation (13).

Here, t _all is a thickness obtained by combining the thickness t ₁ of the measured piece 12 and the thickness t ₃ of the black tape attached to both surfaces of the measured piece 12. That is, t _all = t ₁ + 2t ₃ .

  In the first to third embodiments, the first end portion 13a and the third end portion 17a of the measurement target piece 12 and the comparison piece 16 are held (clamped) by the fixing portions 22 and 22a. And as shown in FIG. 14, the site | part of the 2nd end part 13b and the 4th end part 17b side rather than the 1st end part 13a and the 3rd end part 17a is hold | maintained, ie, 1st from the fixing | fixed part 22 and 22a. The measurement piece 12 and the comparison piece 16 may be installed in the measurement unit 20 in a state where the end portion 13a and the third end portion 17a protrude. In this case, the temperature detection unit 130 (130a, 30) includes the second end 13b and the fourth end from the parts (heated parts) held by the fixing parts 22 and 22a of the measured piece 12 and the comparison piece 16. Temperature distribution up to 17b is detected.

In the first to third embodiments, the measurement piece 12 is installed in the measurement unit 20 by holding a part of the measurement piece 12 in the fixing portions 22 and 22a. The method is not limited to this. For example, as shown in FIG. 15 (A) and FIG. 15 (B), the possible measured pieces 12 to the mounting member 76 to the thermal conductivity k _b and thickness t _b is formed in a known plate-shaped member is attached Thus, the measurement target piece 12 may be configured to be installed in the measurement unit 20.

  Specifically, the attachment member 76 is a rectangular plate-like member extending in one direction (left-right direction in FIG. 15A), and from one end 76a of the attachment member 76 to the other end 76b on one surface. A plurality of temperature sensors 36 are arranged so as to be aligned in a row at intervals. A plurality of temperature sensors 36 arranged on the attachment member 76 constitute the first detection unit 32. In the present embodiment, seven temperature sensors 36 are arranged at equal intervals. One end portion 76 a of the attachment member 76 is held by the fixing portion 22. And the to-be-measured piece 12 is piled up so that the surface in which this several temperature sensor 36 was arrange | positioned may be contact | connected. At this time, the piece 12 to be measured and the attachment member 76 are bonded by a double-sided tape, and the piece 12 to be measured is attached to the fixed portion 22 side so that the end surface on the first end portion 13a side is in contact with the fixed portion 22. (See FIG. 15B).

ここで、ｔ_４は被測定片１２の厚さｔ_１と取付部材７６の厚さｔ_ｂとを合わせた厚さである。 In this case, the temperature distribution of the portion where the mounting member 76 and the measurement piece 12 overlap is used for the calculation, and the first derivation unit 55 of the second calculation unit 54 of the calculation device 40 is connected to the measurement piece 12 and the mounting member. Equivalent thermal conductivity k ₄ is obtained by combining 76. The second deriving unit 56 then calculates the equivalent thermal conductivity k ₄ between the measured piece 12 and the attachment member 76 obtained by the first deriving unit 55 and the measured piece 12 stored in the measured piece information unit 42a. The thermal conductivity k ₁ of the piece 12 to be measured is calculated from the following equation (14) using the thickness t ₁ , the thermal conductivity k _{b of} the mounting member 76, and the thickness t _b of the mounting member 76. . Thus, if shorter than the length of the mounting member, various lengths of the thermal conductivity k ₁ of the measurement piece 12 can be easily measured.

Here, t ₄ is the combined thickness of the thickness t _b of the thickness t ₁ and the mounting member 76 of the measurement piece 12.

  In the first to third embodiments, the measurement piece 12 and the comparison piece 16 are held by the common fixing portions 22 and 22a. However, the present invention is not limited to this, and the measurement piece 12 is held. The fixing portion and the fixing portion where the comparison piece 16 is held may be configured by separate members. Moreover, although the fixing | fixed part 22 and 22a hold | maintain the to-be-measured piece 12 and the comparison piece 16 so that it may rank in parallel mutually, it is not limited to this.

  In the measurement sections 20 and 20a of the first to third embodiments, the measurement piece 12 and the comparison piece 16 are heated and the temperature distribution is detected at the same time. However, the present invention is not limited to this. After the heating of the comparison piece 16 (measurement piece 12) and the detection of the temperature distribution, the thermal conductivity measuring device 10, so that the heating of the measurement piece 12 (comparison piece 16) and the detection of the temperature distribution are performed. 10a and 10b may be configured.

  Specifically, as shown in FIG. 16, the thermal conductivity measurement device includes a measurement unit 20, and the measurement unit 20 includes a fixing unit 22a and a temperature detection unit 30b. The fixing portion 22a holds one of the measurement piece 12 and the comparison piece 16, and the temperature detection unit 30b is a temperature distribution in the longitudinal direction of the measurement piece 12 or the comparison piece 16 held by the fixation portion 22a. Is detected.

The computing device 40 includes a computing unit 50 having a first computing unit 52 and a second computing unit 54, a storage unit 42, a blower control unit 48, and a display unit 46. The storage unit 42 includes a heat transfer coefficient storage unit 42 c that stores the heat transfer coefficient h ₂ of the comparison piece 16 obtained by the first calculation unit 52.

In the thermal conductivity measuring device 10c, first, the comparison piece 16 is heated while being fixed to the fixing portion 22a, and the temperature distribution of the comparison piece 16 is detected by the temperature detection portion 30b. The first calculation unit 52 (52a) of the calculation device 40 obtains the fin efficiency φ _exp from the temperature distribution of the comparison piece 16 and the equation (1), and the fin efficiency φ _exp and the equation (2) (second embodiment). Thus, when the end face on the fourth end side of the comparison piece 16 is in a heat insulating condition, the thermal resistance ratio m ₂ per unit length of the comparison piece 16 is obtained by comparing with the equation (9). First operation unit 52 (52a), when the thermal resistance ratio m ₂ per unit length of comparison piece 16 is obtained, the thermal resistance ratio m ₂ per the unit length, is stored in the comparison piece information unit 42b The heat transfer coefficient h ₂ of the comparison piece 16 is calculated from the equation (5) using the thermal conductivity k ₂ and the shape of the comparison piece 16. The first operation unit 52 (52a) outputs the heat transfer coefficient _{h 2} of the comparative piece 16 is stored in the heat transfer coefficient storage unit 42c of the storage unit 42.

Next, the comparison piece 16 fixed to the fixing portion 22a is removed, and the measured piece 12 is fixed to the fixing portion 22a. And the to-be-measured piece 12 is heated in the state fixed to the fixing | fixed part 22a, and the temperature distribution of the to-be-measured piece 12 is detected by the temperature detection part 30b. The second computing unit 54 (specifically, the first deriving unit 55 (55a)) of the computing device 40 calculates the measured piece 12 from the temperature distribution of the measured piece 12 detected by the temperature detecting unit 30b and the equation (1). The fin efficiency φ _exp is obtained, and the fin efficiency φ _exp and equation (2) (equation (9) when the end surface on the second end side of the measured piece 12 is adiabatic as in the second embodiment) are By comparing, the thermal resistance ratio m ₁ per unit length of the measured piece 12 is obtained. First derivation unit 55 (55a), the heat transfer coefficient h ₂ of the comparative pieces 16 stored calculated by the first calculating unit 52 to the heat transfer coefficient storage unit 42c of the storage unit 42 the drawer, the heat transfer coefficient The measured piece from Equation (7) using h ₂ , the thermal resistance ratio m ₁ per unit length of the measured piece 12, and the shape of the measured piece 12 stored in the measured piece information section 42 a. A thermal conductivity k ₁ of 12 is calculated.

Thus, for a comparison piece 16 to be measured piece 12, even if carried out heating and temperature distribution detection in order, from the temperature distribution thermal conductivity k ₂ is actually heated known comparison piece 16 by utilizing the heat transfer coefficient h ₂ obtained as the calculation heat transfer coefficient, the heat transfer of the measurement piece 12 by a calculation using a formula such as natural convection and radiant against the plate to be measured pieces of vertical arrangement Even if the rate h ₁ is not calculated, the thermal conductivity k ₁ of the measured piece 12 can be obtained.

Note that the thermal conductivity to be obtained is obtained by making the atmospheric condition in the measurement piece 12 and the atmospheric condition in the comparison piece 16 the same when the measurement piece 12 and the comparison piece 16 are heated and the temperature distribution is detected. measurement system of k ₁ is further improved.

The thermal conductivity measuring device obtains the thermal conductivity k ₁ of the measured piece 12 only by heating the measured piece 12 and detecting the temperature distribution without heating the comparative piece 16 and detecting the temperature distribution. It may be configured.

  For example, the following thermal conductivity calculation program is incorporated in the arithmetic device (for example, a computer) 40 of the first embodiment.

The temperature of the measurement piece 12 detected continuously or intermittently along the direction from the one end portion 13a of the measurement piece 12 to the other end portion 13b in a state where the one end portion 13a of the measurement piece 12 is heated. distribution and, with the thermal conductivity k ₂ is one end 17a of a known plate-like comparison piece 16 is heated, continuously or intermittently along the direction toward the other end portion 17b from one end 17a of the comparison piece 16 The arithmetic device 40 receives the detected temperature distribution of the comparison piece 16 and the thermal conductivity k ₂ of the comparison piece 16, so that the arithmetic device 40 has a thermal resistance ratio per unit length of the comparison piece 16. A first computing unit (comparison piece heat transfer coefficient deriving means) 52 for obtaining the heat transfer coefficient h ₂ of the comparison piece 16 from m ₂ , the thermal conductivity k ₂ of the comparison piece 16, and the temperature distribution of the comparison piece 16. If a thermal resistance ratio m ₁ per unit length of the measurement piece 12, the first operation unit 5 In the heat transfer coefficient h ₂ of the comparative pieces 16 derived, first derivation unit of the second arithmetic unit 54 for obtaining the temperature distribution of the measurement piece 12, the thermal conductivity k ₁ of the measured pieces 12 (the Measurement piece thermal conductivity deriving means) 55.

  On the other hand, the following thermal conductivity calculation program may be incorporated in an arithmetic device (for example, a computer etc.).

The temperature of the measurement piece 12 detected continuously or intermittently along the direction from the one end portion 13a of the measurement piece 12 to the other end portion 13b in a state where the one end portion 13a of the measurement piece 12 is heated. The arithmetic device receives the distribution and the heat transfer coefficient for calculation h _2a based on the temperature distribution along the direction from the one end to the other end of the member when the one end of the plate-like member is heated. The heat conduction of the measurement piece 12 is calculated from the thermal resistance ratio m ₁ per unit length of the measurement piece 12, the heat transfer coefficient h _2a for calculation, and the temperature distribution of the measurement piece 12. first derivation unit of the second calculation unit 54a for obtaining the rate k ₁ to function as (measured Katanetsu conductivity deriving means) 55.

Specifically, a thermal conductivity measurement device in which the above-described thermal conductivity calculation program is incorporated in an arithmetic device includes a measurement unit 20 and an arithmetic device 40 as shown in FIG. The measuring unit 20 includes a fixing unit 22a that fixes the measurement piece 12, and a temperature detection unit 30b that detects a temperature distribution in the longitudinal direction of the measurement piece 12 fixed to the fixing unit 22a. The calculation device 40 includes a second calculation unit 54 a, a storage unit 42, a blower unit control unit 48, and a display unit 46. Storage unit 42 has a heat transfer coefficient storage unit 142c that stores calculation heat transfer coefficient _{h 2a.} The heat transfer coefficient for calculation h _2a is the temperature distribution of the plate member along the direction from one end portion to the other end portion of the member when the one end portion of the plate member having a known thermal conductivity k is heated. It is based on and is obtained by an experiment or calculation by a computer or the like. The calculation heat transfer coefficient h _2a is stored in advance in the heat transfer coefficient storage unit 142c of the storage unit 42 from the input unit 44 or the like. Specifically, the heat transfer coefficient for calculation h _2a is a value corresponding to the temperature distribution along the longitudinal direction of the plate-like member, and is expressed by this function when the temperature distribution (temperature distribution is approximated by a function). When the shape of the curve changes, it changes correspondingly. That is, the calculation heat transfer coefficient h _2a is a function of the temperature distribution of the plate member. For example, the heat transfer coefficient for calculation h _2a is a function f (x) of the temperature distribution of the plate member along the direction from one end portion to the other end portion of the member when the one end portion of the plate member is heated. Is expressed as a functional F (f (x)) having the function f (x) as a variable function. The calculation heat transfer coefficient h _2a stored in the heat transfer coefficient storage unit 142c is not limited to a function of the temperature distribution of the plate member. For example, the temperature distribution in thousands of different plate-like members and the heat transfer coefficient h of the plate-like member from which each temperature distribution is obtained are associated and stored in the heat transfer coefficient storage unit 142c, and from these stored temperature distributions The temperature distribution close to the detected temperature distribution of the measured piece 12 may be selected, and the heat transfer coefficient h corresponding to the selected temperature distribution may be used as the calculation heat transfer coefficient h _2a .

In the thermal conductivity measuring device 10d, the measured piece 12 is fixed to the fixing portion 22a. And the to-be-measured piece 12 is heated in the state fixed to the fixing | fixed part 22a, and the temperature distribution is detected by the temperature detection part 30b. The second computing unit 54a (specifically, the first deriving unit 55) of the computing device 40 calculates the fin efficiency of the measured piece 12 from the temperature distribution of the measured piece 12 detected by the temperature detecting unit 30b and the equation (1). φ _exp is obtained, and the thermal efficiency ratio m ₁ per unit length of the measured piece 12 is obtained by comparing the fin efficiency φ _exp with the formula (2). First derivation unit 55 draws calculation heat transfer coefficient h _2a which is previously stored in the heat transfer coefficient storage unit 142c of the storage unit 42, and this operation heat transfer coefficient h _2a, unit length of the measurement piece 12 The thermal conductivity k ₁ of the measured piece 12 is calculated from the equation (7) using the thermal resistance ratio m ₁ per unit and the shape of the measured piece 12 stored in the measured piece information section 42a.

As in the thermal conductivity measuring apparatus 10d, even if the calculation heat transfer coefficient h _2a stored in the storage unit 42 (specifically, the heat transfer coefficient storage unit 142c) is used as a function of the temperature distribution, Even if the heat transfer coefficient h ₁ of the measured piece 12 is not calculated by a calculation using a calculation formula such as a natural convection formula or a radiation formula for the plate-like measured piece 12, the thermal conductivity k ₁ of the measured piece 12 can be calculated. Can be sought.

Further, the temperature distribution of the comparison piece (a plate-like member having a known thermal conductivity k) 16 is measured by using the calculation heat transfer coefficient h _2a stored in the storage unit in advance as a function of the temperature distribution. since it is not necessary to obtain the heat transfer coefficient h ₂ of the comparative piece 16 Te, only measures the temperature distribution of the measurement piece 12, it is possible to determine the thermal conductivity k ₁ of the measurement piece 12 by calculation. Thereby, simplification of an apparatus structure can be achieved.

  In the first to third embodiments, the fixing portions 22 and 22a also serve as a heating portion for heating the first end portion 13a and the third end portion 17a. A fixing portion that holds the (comparison piece 16) and a heating portion that heats the first end portion 13a (third end portion 17a) of the measurement target piece 12 (comparison piece 16) may be provided.

In the first to third embodiments, the object to be measured thermal conductivity k ₁ is measured (the measured piece 12) is a material having a fixed form, but is not limited thereto. That is, the thermal conductivity measuring device can also measure the thermal conductivity k of a soft material such as resin or grease.

  Specifically, in this case, the piece 12 to be measured is configured by sandwiching a soft material 19 between a pair of thickness adjusting thin pieces 15 and 15 as shown in FIG.

Then, the measurement piece information section 42a of the storage unit 42 from the input unit 44, the thickness of the soft material 19 (i.e., distance between the pair of thickness adjusting lamina 15, 15) _{t s} and the thickness of the measurement piece 12 t ₁ (= t _s + 2t _p ) is input, and the second deriving unit 56 of the second computing unit 54 adjusts the pair of thicknesses of the measured piece 12 (soft material 19) obtained by the first deriving unit 55. Based on the thermal conductivity k ₁ of the measured piece 12) sandwiched between the thin pieces 15, 15, the thermal conductivity k _s of the soft material 19 is obtained. Specifically, the second derivation unit 56 includes the thermal conductivity k ₁ of the measured piece 12 obtained by the first derivation unit 55, the thickness t ₁ (= t _s + 2t _p ) of the measured piece 12, and the thickness of the soft material 19 stored in the measured piece information section 42a (i.e., the distance between the pair of thickness adjusting lamina 15, 15) t _s and, adjusting the thickness stored in the measured piece information section 42a the equation (15) below and a thickness _{t p} of the thermal conductivity _{k p} and thickness control slices 15 slices 15 calculates the thermal conductivity _{k s} soft material 19.

By measuring in this way, the thermal conductivity of the soft material 19 itself can be obtained because the interface thermal resistance between the soft material 19 and the thickness adjusting thin piece 15 in the measured piece 12 is not affected. That is, in the conventional one-way heat flow steady comparison method, the influence of the interfacial thermal resistance component appears greatly on the obtained thermal conductivity, but the interfacial thermal resistance included in the thermal conductivity k _s obtained as described above. Since the component can be ignored as compared with other thermal resistance components, the thermal conductivity k _s of the soft material 19 can be obtained with higher accuracy.

In the measured piece 12 for measuring the thermal conductivity k _s of soft material 19, as the thickness t _s of the thickness of thin and soft material 19 in the thickness adjustment lamina 15 is thick, obtained thermal conductivity The accuracy of k _s is increased. The details are as follows.

Soft material (e.g., grease) thermal conductivity of 19 k _s and thickness control slices sandwiching the (e.g., a plate formed of SUS) seeking effective thermal conductivity of the measurement piece 12 with respect to the thickness t _p of 15 The results are shown in FIGS. 19 (A) and 19 (B). In these figures, the thermal conductivity k _s of the soft material 19 can be measured with higher sensitivity as the upward slope of the curve in the graph increases. According to FIGS. 19A and 19B, the curve representing the thickness adjusting flake 15 having a thickness of 0.1 mm is more curved than the curve representing the thickness adjusting flake 15 having a thickness of 1 mm. It can be seen that the slope of rising to the right is larger. Further, the right side of the graph with a thickness of 0.5 mm rises from the curve representing the soft material 19 having a thickness of 0.1 mm, and the curve representing the soft material 19 having a thickness of 1 mm than the graph having the thickness of 0.5 mm. It can be seen that the slope of the upward slope is larger. Therefore, when forming the measured pieces 12, by thicker thickness t _s of the thinner the thickness t _p of the thickness adjusting lamina 15 and the soft material 19, the thermal conductivity of the resulting soft material 19 The accuracy of the rate k _s is further improved.

  In the first to third embodiments, when the thickness of the object to be measured (measurement piece main body) 14 having a low thermal conductivity is small, the measurement piece 12 is configured by being laminated with the thickness adjusting thin piece 15. The thermal conductivity of the device under test 14 is measured by increasing the cross-sectional area through which heat flows. You may enlarge it. That is, in the case of a plate member of the same material, the thermal conductivity obtained by one sheet and the thermal conductivity obtained by stacking a plurality of sheets have the same value. By configuring, the cross-sectional area through which the heat flow from the one end portion 13a to the other end portion 13b passes is increased, and the temperature gradient of the heat flowing from the one end portion 13a to the other end portion 13b is set to a size suitable for calculation. Thus, it is possible to obtain the thermal conductivity of the object to be measured which is thin or has a small thermal conductivity.

10, 10a, 10b Thermal conductivity measuring device 12 Test piece 13a First end (one end of the test piece)
13b Second end (the other end of the measured piece)
14 Measurement piece body 15 Thickness adjustment thin piece 16 Comparison piece 16a, 16b, 16c Comparison thin piece 17a Third end (one end of comparison piece)
17b Fourth end (the other end of the comparison piece)
22, 22a fixed part 32, 32a first detection part (measurement piece temperature distribution detection part)
34, 34a Second detector (comparison piece temperature distribution detector)
36, 136 Temperature sensor 37 Blower fan (Blower unit)
38 rectifier plate 40 arithmetic unit 42 storage unit 44 input units 52, 52a first arithmetic unit (comparison piece heat transfer coefficient deriving unit)
54, 54a Second calculation unit (measurement piece thermal conductivity deriving unit)
55, 55a 1st derivation part 56 2nd derivation part h ₁ heat transfer coefficient h of the piece to be measured h ₂ heat transfer coefficient k of the comparison piece ₁ heat conductivity of the piece to be measured k ₂ heat conductivity of the comparison piece (equivalent heat conduction) rate)
k _p thickness adjusting thermal conductivity m ₁ unit thermal resistivity R _cd2 comparison piece of thermal resistance ratio R _cd1 measured piece of Comparative pieces per thermal resistance ratio m ₂ unit length of the measured pieces per length of the foil the heat transfer resistance phi _exp fin efficiency of the thermal resistivity _{R cv1} heat transfer resistance _{R cv2} comparison pieces of the measurement piece

Claims (17)

A thermal conductivity measuring device for deriving the thermal conductivity of a plate-like measured piece,
A heating unit that heats one end of the measured piece;
A temperature distribution detector that detects the temperature distribution of the measured piece continuously or intermittently along the direction from one end of the fixed piece to the other end;
An arithmetic unit for calculating the thermal conductivity of the measurement piece,
The computing device includes a storage unit that stores a heat transfer coefficient for computation, a first heat conduction resistance that is a resistance when heat flows from one end portion to the other end portion of the measured piece, and the measured target. A first thermal resistance ratio, which is a ratio of the first heat transfer resistance, which is a resistance when heat is generated from the surface of the measurement piece to the space around the measurement piece, and an operation stored in the storage unit A measured piece thermal conductivity deriving unit for obtaining a thermal conductivity of the measured piece from a heat transfer coefficient and a temperature distribution of the measured piece detected by the temperature distribution detecting unit;
The calculation heat transfer coefficient is based on a plate-like member temperature distribution along a direction from one end portion to the other end portion of the member when the one end portion of the plate-like member having a known thermal conductivity is heated. Thermal conductivity measuring device.   The thermal conductivity measuring device according to claim 1, wherein the heat transfer coefficient for calculation is stored in the storage unit as a function of the temperature distribution of the plate member. The heating unit is capable of heating one end of a comparison piece that is a plate-like member having a known thermal conductivity,
The temperature distribution detector can detect the temperature distribution of the comparison piece continuously or intermittently along the direction from one end of the comparison piece to the other end,
The arithmetic unit heats the interior of the comparison piece from the surface of the comparison piece to the second heat conduction resistance, which is a resistance when heat flows from one end to the other end, and to the space around the comparison piece. The second heat resistance ratio, which is the ratio with the second heat transfer resistance, which is the resistance when the heat is emitted, the thermal conductivity of the comparison piece, and the temperature distribution of the comparison piece detected by the temperature distribution detector And a comparison piece heat transfer coefficient derivation unit for obtaining the heat transfer coefficient of the comparison piece from
The thermal conductivity measuring device according to claim 1, wherein the storage unit stores the heat transfer coefficient of the comparison piece obtained by the comparison piece heat transfer coefficient deriving unit as the heat transfer coefficient for calculation. The heating unit includes a measurement piece heating unit that heats one end of the measurement piece, and a comparison piece heating unit that heats one end of a plate-like comparison piece having a known thermal conductivity,
The temperature distribution detection unit is a measurement piece temperature distribution detection unit that detects the temperature distribution of the measurement piece continuously or intermittently along a direction from one end portion of the measurement target piece to the other end portion, and A comparison piece temperature distribution detection unit that detects the temperature distribution of the comparison piece continuously or intermittently along the direction from one end of the comparison piece to the other end;
The measured piece thermal conductivity deriving unit includes the first thermal resistance ratio, a calculation heat transfer coefficient stored in the storage unit, and the measured piece detected by the measured piece temperature distribution detecting unit. The thermal conductivity measuring device according to claim 3, wherein the thermal conductivity of the measured piece is obtained from the temperature distribution of the sample.   The thermal conductivity measuring apparatus according to claim 4, further comprising an atmosphere control unit configured to control the periphery of the measurement piece and the periphery of the comparison piece under the same atmospheric condition. The measurement piece thermal conductivity deriving unit is detected by the first piece of thermal resistance ratio and the heat transfer coefficient of the comparison piece obtained by the comparison piece heat transfer coefficient deriving unit and the measurement piece temperature distribution detection unit. A first derivation unit for obtaining the thermal conductivity of the measurement piece from the temperature distribution of the measurement piece;
When the measured piece is configured by laminating the measured thin piece and one or more plate-shaped thickness adjusting thin pieces with known thermal conductivity, the measured value obtained by the first deriving unit is obtained. From the thermal conductivity of the measurement piece, the thickness of the measurement piece, the thickness of the measurement piece, the thermal conductivity of the thickness adjustment piece, and the thickness of the thickness adjustment piece, the thermal conductivity of the measurement piece is determined. The thermal conductivity measuring device according to claim 3, further comprising a second derivation unit to be obtained.   The thermal conductivity measuring device according to any one of claims 3 to 6, further comprising a comparative piece configured by stacking a plurality of comparative thin pieces having the same or different thermal conductivities. A thermal conductivity calculation device for calculating the thermal conductivity of a plate-shaped measurement piece,
The heat transfer coefficient for calculation is stored, and the one end of the measurement piece is continuously or intermittently detected along the direction from one end to the other end of the measurement piece while being heated. A storage unit for storing the temperature distribution of the measured piece;
Heat is emitted from the surface of the measurement piece to the space around the measurement piece, the first heat conduction resistance that is resistance when heat flows from one end to the other end of the measurement piece. A first heat resistance ratio that is a ratio to the first heat transfer resistance that is a resistance of the operation, a heat transfer coefficient for calculation stored in the storage unit, and the measured piece stored in the storage unit A temperature distribution, and a measured piece thermal conductivity derivation unit for obtaining the thermal conductivity of the measured piece from the temperature distribution,
The calculation heat transfer coefficient is based on a plate-like member temperature distribution along a direction from one end portion to the other end portion of the member when the one end portion of the plate-like member having a known thermal conductivity is heated. Thermal conductivity calculator.   The thermal conductivity calculation device according to claim 8, wherein the heat transfer coefficient for calculation is stored in the storage unit as a function having the plate member temperature distribution as a variable. The storage unit is directed from the one end of the comparison piece to the other end in a state where the heat transfer coefficient of the comparison piece, which is a plate-like member having a known thermal conductivity, and one end of the comparison piece is heated. Storing the temperature distribution of the comparison piece detected continuously or intermittently along the direction,
The arithmetic unit heats the interior of the comparison piece from the surface of the comparison piece to the second heat conduction resistance which is a resistance when heat flows from one end to the other end and the space around the comparison piece. A second heat resistance ratio that is a ratio with a second heat transfer resistance that is a resistance at the time of occurrence of heat, a thermal conductivity of a comparison piece stored in the storage unit, and a comparison piece stored in the storage unit A heat distribution coefficient deriving section for obtaining the heat transfer coefficient of the comparison piece from the temperature distribution of
The comparison piece heat transfer coefficient derivation unit stores the heat transfer coefficient of the comparison piece obtained in the comparison piece heat transfer coefficient derivation unit in the storage unit as the heat transfer coefficient for calculation. Thermal conductivity calculator. A thermal conductivity calculation program for calculating the thermal conductivity of a plate-shaped object to be measured,
In a state where one end of the measured piece is heated, the temperature distribution of the measured piece detected continuously or intermittently along the direction from the one end to the other end of the measured piece, and a plate shape When the computer receives the heat transfer coefficient for calculation based on the first temperature distribution along the direction from one end to the other end of the member when one end of the member is heated,
This computer,
Heat is emitted from the surface of the measurement piece to the space around the measurement piece, the first heat conduction resistance that is resistance when heat flows from one end to the other end of the measurement piece. The thermal conductivity of the measured piece from the first thermal resistance ratio, which is a ratio to the first heat transfer resistance that is the resistance of the time, the heat transfer coefficient for calculation, and the temperature distribution of the measured piece The thermal conductivity calculation program for making it function as a to-be-measured piece thermal conductivity derivation means for calculating | requiring. A thermal conductivity measurement method for deriving the thermal conductivity of a plate-shaped measurement piece,
A measurement piece temperature distribution detection step of heating one end of the measurement piece and detecting a temperature distribution of the measurement piece continuously or intermittently along a direction from the one end to the other end of the measurement piece; ,
Heat is emitted from the surface of the measurement piece to the space around the measurement piece, the first heat conduction resistance that is resistance when heat flows from one end to the other end of the measurement piece. Along the direction from one end of the member to the other end when the one end of the plate-like member is heated, and the first heat resistance ratio that is the ratio of the first heat transfer resistance that is the resistance The measured piece for obtaining the thermal conductivity of the measured piece from the heat transfer coefficient for calculation based on the plate member temperature distribution and the temperature distribution of the measured piece detected in the measured piece temperature distribution detecting step A thermal conductivity measurement method comprising: a thermal conductivity derivation step.   The thermal conductivity measurement method according to claim 12, wherein the heat transfer coefficient for calculation is obtained in advance as a function having the plate member temperature distribution as a variable. One end of a comparison piece, which is a plate-like member having a known thermal conductivity, is heated, and the temperature distribution of the comparison piece that is continuous or intermittent along the direction from one end to the other end of the comparison piece is detected. A comparison piece temperature distribution detection step;
A second heat conduction resistance which is a resistance when heat flows from one end to the other end in the inside of the comparison piece and a resistance when heat is emitted from the surface of the comparison piece to the space around the comparison piece A second heat resistance ratio that is a ratio to the second heat transfer resistance, a thermal conductivity of the comparison piece, and a temperature distribution of the comparison piece detected in the comparison piece temperature distribution detection step. A comparison piece heat transfer coefficient derivation step for obtaining a heat transfer coefficient of the comparison piece,
17. The measurement piece thermal conductivity deriving step obtains the thermal conductivity of the measurement piece using the heat transfer coefficient of the comparison piece obtained in the comparison piece heat transfer coefficient deriving step as the heat transfer coefficient for calculation. Or the thermal conductivity measuring method of 13. Before the comparison piece temperature distribution detection step, comprising a comparison piece forming step of forming the comparison piece by laminating a plurality of comparison thin pieces having the same or different thermal conductivity,
In the comparison piece forming step, the temperature distribution detected in the comparison piece temperature distribution detection step is the same or different from each other so that the temperature distribution of the measurement piece detected in the measurement piece temperature distribution detection step is close to the temperature distribution of the measurement piece. The thermal conductivity measuring method according to claim 14, wherein a plurality of comparative thin pieces having thermal conductivity are combined to form the comparative piece.   The heat according to any one of claims 12 to 15, further comprising a measurement piece creation step of forming the measurement piece by laminating a plurality of measurement thin pieces before the measurement piece temperature distribution detection step. Conductivity measurement method. Before the measurement piece temperature distribution detecting step, the measurement piece is formed by laminating the measurement piece and one or more plate-shaped thickness adjustment pieces with known thermal conductivity. Forming process;
The thermal conductivity of the measured piece, the thickness of the measured piece, the thickness of the measured thin piece, the thermal conductivity of the thickness adjustment thin piece, and the thickness adjustment obtained in the step of deriving the measured piece thermal conductivity The thermal conductivity measuring method according to any one of claims 12 to 15, further comprising: a measured thin piece thermal conductivity derivation step for obtaining a thermal conductivity of the measured thin piece from a thickness of the thin piece.

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