JP5728764B2 - Impedance measurement sensor and impedance measurement device - Google Patents

Description

  The present invention relates to an impedance measurement sensor and an impedance measurement device, and more particularly to a case in which a large number of rod-shaped members are collected, for example, a fluid flowing between rod-shaped members that are fuel cladding tubes in a nuclear reactor. It is useful to apply.

  Understanding the status of cooling water flowing between the fuel rod cladding tubes of a nuclear reactor is essential for the thermal design of the nuclear reactor. In order to optimally perform such a thermal design, it is premised that the state of the cooling water (the existence ratio of gas and liquid) and the behavior (flow velocity, flow direction) are accurately grasped. In order to accurately grasp the state of the cooling water (gas / liquid abundance, etc.) and behavior (flow velocity, flow direction), as much as possible in the cross section perpendicular to the flow direction of the cooling water (axial direction between the fuel rod covers) There is a need to collect information in many ways.

  However, there is no measuring device for accurately measuring the fluid state at multiple points in the cross section as described above.

  A wire mesh sensor as shown in Non-Patent Document 1 is known as a sensor for obtaining time-series information of the amount of liquid and gas in a gas-liquid two-phase flow at multiple points in the cross section of the fluid flowing through the pipeline. It has been. As shown in FIG. 13 (a), the wire mesh sensor crosses over a predetermined distance in the axial direction of the pipe 1 through which the fluid flows, and also shows a cross section of the pipe 1 as shown in FIG. 13 (b). The first wire electrode 2 and the second wire electrode 3 are arranged in a square lattice pattern in the inside, and the first wire electrode 2 is used as an excitation electrode and the second wire electrode 3 is used as a measurement electrode. It is an impedance sensor. The wires are close together but not in contact. The following are called intersections for convenience.

  In an impedance measuring sensor having such a wire mesh sensor, as shown in FIG. 14, an excitation pulse PI is sequentially applied to the input line formed by the first wire electrode 2 by switches S1, S2, S3 and S4 from the first row. The Here, the excitation pulse PI is supplied from the power supply 4 via the changeover switch SP.

  Accompanying the application of the excitation pulse PI as described above, the intersection ([11], [21], [31], [41]) of the first wire electrode 2 and the second wire electrode 3 ([14] , [24], [34], [44]), the impedance at each intersection ([11], [21], [31], [41])... ([14], [24], [34 ] And [44]) vary depending on the state of the fluid that is short-circuited. As a result, each intersection ([11], [21], [31], [41]) ... ([14], [24], [34]) is formed on the output line formed by the second wire electrode 3. , [44]), the measurement signals PO1, PO2, PO3, PO4 reflecting the impedance are output for each row. Consider a case where the excitation pulse PI is applied to the first wire electrode 2 connected to the switch S4 by closing the switch S4. In this case, when the bubble 5 is present at the intersection [24] while the other intersections [14], [34] and [44] are filled with liquid, the impedance at the intersection [24] Since the impedance is smaller than the impedance at the intersections [14], [34] and [44], the measurement signal PO2 obtained via the second wire electrode 3 corresponding to this intersection [24] is the other measurement signals PO1, PO3. , PO4 is detected as an impedance lower than PO4. That is, the average levels of the measurement signals PO1, PO3, PO4 are the intersection points ([11], [21], [31], [41]) ([14], [24], [34], [44]). ) Reflects the abundance of liquid (for example, water) and gas (bubble 5) in the gas-liquid two-phase flow. As a result, each of the intersections ([11], [21], [31], [41])... ([14], [24], [41] is obtained by processing the measurement signals PO1 to PO4 by the arithmetic processing unit 6. 34] and [44]), for example, the abundance of a desired substance such as a gas-liquid ratio in a gas-liquid two-phase flow can be measured by calculation.

H.Pietruske.H.-M.Prasser / Flow Measurement and Instrumentation 18 (2007) 87-94

  However, the wire mesh sensor as described above is limited to the case where the fluid flowing through the pipe is a measurement target, and is not applicable when the cooling water flowing between the fuel rod cladding tubes of the nuclear reactor is the measurement target. Furthermore, in general terms, this method cannot be applied to a case where a fluid that flows along the respective axial directions between the rod-shaped members of a rod-shaped member aggregate obtained by collecting a large number of rod-shaped members is a measurement target. That is, it cannot be applied when a medium including a fluid existing between the rod-shaped members is to be measured.

  In view of the above prior art, the present invention is applied to a case where a medium existing between rod-shaped members is a measurement object, and accurately measures the abundance of a plurality of types of substances having different impedances with a rational apparatus configuration. An object of the present invention is to provide an impedance measurement sensor and an impedance measurement device to be obtained.

A first aspect of the present invention that achieves the above object is an impedance measurement sensor for measuring a medium existing between and around a plurality of rod-shaped members, wherein the entire surface of each rod-shaped member is an excitation electrode. Or it has a rod-shaped member constituted by a conductive member so as to function as a measurement electrode, and a wire electrode arranged between adjacent rod-shaped members and configured to function as a measurement electrode or an excitation electrode It is in the impedance measurement sensor characterized by this.

  According to this aspect, the rod-shaped member which is an existing structure can be used as an electrode, and the impedance resulting from the medium existing between and around the rod-shaped members can be measured at multiple points. Further, when the rod-shaped member is used as either one of the excitation electrode or the measurement electrode in this way, the electrode area can be increased, and the measurement sensitivity can be improved.

  According to a second aspect of the present invention, in the impedance measurement sensor described in the first aspect, a part of the rod-shaped member functions as a ground electrode held at the same potential as a reference potential of the excitation electrode. The impedance measuring sensor is characterized in that it is configured.

  According to this aspect, the influence of disturbance can be removed as much as possible, and highly accurate impedance measurement can be performed.

  According to a third aspect of the present invention, in the impedance measurement sensor according to the first or second aspect, the wire electrode includes a plurality of wires arranged in parallel to each other. In the sensor.

  According to this aspect, it is effective when the gap between adjacent rod-shaped members is wide. That is, by disposing, for example, two wire electrodes in the gap, the gap between each rod-shaped member and the corresponding wire electrode can be reduced, and the local impedance in the vicinity of the rod-shaped member surface can be accurately determined. It can be measured.

  According to a fourth aspect of the present invention, in the impedance measurement sensor according to any one of the first to third aspects, the wire electrodes are spaced apart from each other by a predetermined distance and intersect with each other. The impedance measuring sensor is characterized by comprising a wire electrode and a second wire electrode.

  According to this aspect, either between the first wire electrode and the second wire electrode, between the first wire electrode and each rod-shaped member, or between the second wire electrode and each rod-shaped member. Can be used as a measurement point. As a result, the degree of freedom in selecting measurement points is increased, and impedance measurement can be accurately performed at each predetermined point according to demand.

  According to a fifth aspect of the present invention, in the impedance measurement sensor according to any one of the first to fourth aspects, the wire electrode is arranged in a plurality of positions with respect to the axial direction of the rod-shaped member. It is in the impedance measurement sensor characterized by having.

  According to this aspect, the impedance at multiple points of the medium existing between the rod-shaped members can be measured at a plurality of locations in the axial direction of the rod-shaped member.

  According to a sixth aspect of the present invention, in the impedance measurement sensor according to the fifth aspect, each rod-shaped member is formed with an insulating portion for suppressing crosstalk in the axial direction. It is in the impedance measurement sensor.

  According to this aspect, it is possible to accurately perform impedance measurement with high spatial resolution and high measurement accuracy by suppressing mutual interference of impedance measurement sensors respectively formed at a plurality of locations in the axial direction of the rod-shaped member. .

  According to a seventh aspect of the present invention, in the impedance measurement sensor according to any one of the first to sixth aspects, the wire electrode includes a thermocouple element or a thermocouple sheath material. The impedance measuring sensor is characterized in that it is also used as a conductive member.

  According to this aspect, a predetermined wire electrode can be formed using the conductive part of a measurement probe such as a thermocouple, and the configuration of the apparatus can be rationalized accordingly. That is, it is possible to measure the abundance of the substance contained in the medium based on the impedance measurement of the medium between the rod-shaped members, as well as the physical quantity that the measurement probe inherently targets.

  According to an eighth aspect of the present invention, in the impedance measurement sensor according to any one of the first to seventh aspects, a part which is a conductive portion of a measurement probe attached to the rod-shaped member is used as the excitation electrode. The impedance measurement sensor is configured to function as any one of the measurement electrode and the ground electrode.

  According to this aspect, since the electrode can be formed by using the conductive portion of the measurement probe, the medium between the rod-shaped members as well as the physical quantity that is originally targeted by the measurement probe, as in the seventh aspect. Based on the impedance measurement, the abundance of the substance contained in the medium can be measured.

  A ninth aspect of the present invention is based on the impedance measurement sensor according to any one of the first to eighth aspects, and the impedance through the medium between the excitation electrode and the measurement electrode of the impedance measurement sensor, An impedance measuring apparatus comprising: an arithmetic processing unit that calculates the abundances of a plurality of substances in the medium having different impedances existing at measurement positions.

  According to this aspect, the abundance ratio of a plurality of substances in the medium existing between and around each rod-shaped member is determined using the rod-shaped member that is an existing structure as an electrode at multiple points in the medium. It is possible to measure well.

  According to a tenth aspect of the present invention, in the impedance measuring apparatus according to the ninth aspect, the impedance measuring apparatus includes voltage supply means for generating heat by energizing the rod-shaped member or the wire electrode. .

  According to this aspect, when the object to be measured is a heating element, the heat generation state can be easily reproduced, and information regarding the amount of the medium in the heat generation state can be obtained.

  An eleventh aspect of the present invention is the impedance measurement apparatus according to the tenth aspect, wherein either one of a measurement mode for measuring the abundance of the medium and an energization mode for energizing the rod-shaped member or the wire electrode. The impedance measuring apparatus has a control means for controlling so as to be selected.

  According to this aspect, it is possible to obtain information related to the amount of the predetermined medium without being affected by the potential change formed on the rod-shaped member or the wire electrode by energization.

  According to the present invention, it is possible to accurately measure the abundance and the like of a plurality of types of media having different impedances at multiple points in the medium with the medium existing between and around the rod-shaped member as a measurement target. At this time, since the rod-shaped member, which is an existing structure, is used as an electrode, the apparatus configuration is also rational. Moreover, since the electrode area can be increased in the electrode formed of the rod-shaped member, the measurement sensitivity can be improved.

It is the schematic diagram which shows the impedance measurement sensor which concerns on the 1st Embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is a schematic diagram which shows the impedance measurement apparatus which has an impedance measurement sensor shown in FIG. It is the schematic diagram which shows the impedance measurement sensor which concerns on the 2nd Embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on the 3rd Embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on the 4th Embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on the 5th Embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on other embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on other embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on other embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is a schematic diagram which shows the impedance measurement sensor which concerns on other embodiment of this invention. It is the schematic diagram which shows the impedance measurement sensor which concerns on other embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is the schematic diagram which shows the impedance measurement sensor which concerns on other embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. It is a schematic diagram which shows the impedance measurement sensor which concerns on a prior art. It is a schematic diagram which shows the impedance measurement apparatus which has an impedance measurement sensor of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

<First Embodiment>
1A and 1B are schematic views showing an impedance measurement sensor according to a first embodiment of the present invention. FIG. 1A is a plan view, and FIG. 1B is a side view of FIG. As shown in both figures, the rod-shaped member assembly 11 is an existing structure formed by assembling a large number of rod-shaped members 12 whose axial directions are aligned in the same direction. Are configured such that fluid flows along the respective axial directions. In this embodiment, each rod-shaped member 12 is configured to function as any one of the electrodes of the impedance measurement sensor, that is, the excitation electrode, the measurement electrode, or the ground electrode held at the same potential as the reference potential of the excitation electrode. is there. Therefore, the rod-shaped member 12 is formed of a conductive material, for example, a pipe line. An assembly of fuel rod cladding tubes in a nuclear reactor is a preferred example of this type of rod-shaped member assembly 11.

  Wire electrodes are disposed between the adjacent rod-shaped members 12. The wire electrode in this embodiment is composed of a first wire electrode 13 and a second wire electrode 14 that are separated from each other by a predetermined distance with respect to the axial direction of the rod-shaped member 12 and intersect each other. In this embodiment, since the rod-shaped members 12 are disposed in a square lattice shape as shown in FIG. 1A, the first and second wire electrodes 13 disposed between the adjacent rod-shaped members 12 are arranged. , 14 are also arranged in a square lattice, and are configured to function as any one of an excitation electrode, a measurement electrode, and a ground electrode.

  The impedance measurement sensor according to this embodiment is used as a sensor of an impedance measurement device, but the following three types of modes are conceivable for specific use. A first mode in which the first wire electrode 13 functions as an excitation electrode, the second wire electrode 14 functions as a measurement electrode, and the rod-shaped member 12 functions as a ground electrode, the rod-shaped member 12 functions as an excitation electrode, and first and second wires There are three types, the second mode in which the electrode 13 functions as a measurement electrode, and the third mode in which the first case and the second case are used simultaneously.

  FIG. 2 is a schematic diagram showing an impedance measuring device having an impedance measuring sensor according to this embodiment. This figure shows a case where the impedance measurement sensor is used in the first mode. That is, the first wire electrode 13 becomes an input line of the impedance measuring device, and the second wire electrode 14 becomes the same output line. Therefore, in this case, the intersection ([11], [21], [31], [41]) of the first wire electrode 13 and the second wire electrode 14 ([14], [24], The impedance at [34], [44]) is measured. 2 shows a case where the first wire electrode 13 connected to the switch S4 is selected as an input line when the switch S4 is closed, and the bubble 5 exists at the intersection [24]. . Here, although not shown in order to avoid complications in the figure, the rod-shaped member 12 is connected to the ground and functions as a ground electrode.

  Also in the impedance measuring apparatus, the impedance reflecting the state of the intersection ([11], [21], [31], [41]) ([14], [24], [34], [44]) The measurement signals PO1 to PO4 based on the above are subjected to predetermined arithmetic processing by the arithmetic processing unit 6 to thereby determine the abundances of a plurality of types of substances having different impedances in the fluid flowing along the axial direction between the many rod-shaped members 12. It can be measured accurately. The impedance information obtained here relates to multiple points scattered in a cross section perpendicular to the axial direction of the rod-shaped member 12. That is, time-series information of the abundance of a desired substance based on impedance, such as the gas-liquid two-phase flow rate in the gas-liquid two-phase flow and the flow pattern of the gas-liquid two-phase flow, is collected at each point in the cross section. be able to.

  On the other hand, in the second mode, the rod-shaped member 12 serves as an input line for the impedance measuring device, and the first and second wire electrodes 13 and 14 serve as the same output line. Therefore, in this case, the impedance between the outer peripheral surface of the rod-shaped member 12 and the first wire electrode 13 and between the outer peripheral surface of the rod-shaped member 12 and the second wire electrode 14 is measured. In the third mode, either the first mode or the second mode can be selected. Each of these modes can be realized arbitrarily and easily by selecting electrodes connected to the input line and output line. In particular, in the third mode, the rod-shaped member 12 may be connected so as to be used as an arbitrary electrode such as a ground electrode or an excitation electrode.

<Second Embodiment>
3A and 3B are schematic views showing an impedance measurement sensor according to the second embodiment of the present invention. FIG. 3A is a plan view, and FIG. 3B is a side view of FIG. As shown in both figures, in this embodiment, each wire electrode is formed of two wires. That is, the first and second wire electrodes (13A, 13B) and (14A, 14B) are separated from each other by a predetermined distance with respect to the axial direction of the rod-shaped member 12 and are arranged in parallel to each other. Become.

  This embodiment is effective when the gap between the adjacent rod-shaped members 12 is wide. That is, two first and second wire electrodes 13A, 13B, 14A, and 14B are disposed in the gap, whereby the first and second wire electrodes 13A respectively corresponding to the rod-shaped members 12 are respectively provided. , 13B, 14A, 14B can be reduced, and the local impedance near the surface of the rod-shaped member can be measured with high accuracy.

  An impedance measuring device using the impedance measuring sensor according to the present embodiment can also be constructed in the same manner as in the first embodiment.

<Third Embodiment>
4A and 4B are schematic views showing an impedance measurement sensor according to a third embodiment of the present invention, in which FIG. 4A is a plan view, and FIG. 4B is a side view of FIG. As shown in both figures, this embodiment has a plurality of sets (three sets in the figure) of first and second wire electrodes (131, 132, 133), (141, 142, 143). That is, the first and second wire electrodes (131, 132, 133) and (141, 142, 143) are arranged in a plurality of locations (three locations in the figure) with respect to the axial direction of the rod-shaped member 12. It has become.

  According to this embodiment, the impedance at multiple points in the cross-sectional direction of the rod-shaped member 12 caused by the fluid flowing between the rod-shaped members 12 can be measured at a plurality of locations in the axial direction of the rod-shaped member 12. That is, for example, it is possible to collect time-series information on the abundance of a desired substance based on impedance, such as a spatial change or flow velocity of a gas-liquid two-phase flow with respect to the axial direction of the rod-shaped member 12.

<Fourth embodiment>
5A and 5B are schematic views showing an impedance measurement sensor according to a fourth embodiment of the present invention. FIG. 5A is a plan view, and FIG. 5B is a side view of FIG. As shown in both figures, each rod-shaped member 12 in this embodiment has insulating portions 15A and 15B formed in the middle of the respective axial directions.

  According to this embodiment, the impedance measurement sensor formed at a plurality of locations (two locations in the figure) with respect to the axial direction of the rod-shaped member 12 is prevented from mutual interference (crosstalk), and accurate impedance measurement is accurately performed. be able to. That is, by isolating the impedance measurement sensors independent at each stage by the insulating portions 15A and 15B, the signal of the impedance measurement sensor at a specific stage wraps around and affects the signal of the impedance measurement sensor at another stage. Can be prevented as much as possible.

  An impedance measuring device using the impedance measuring sensor according to the present embodiment can be constructed in the same manner as in the third embodiment.

<Fifth embodiment>
6A and 6B are schematic views showing an impedance measurement sensor according to a fifth embodiment of the present invention, in which FIG. 6A is a plan view and FIG. 6B is a view of FIG. This embodiment is a case where other constituent members of a measurement probe such as a thermocouple attached to a rod-shaped member are also used as electrodes. That is, as shown in FIGS. 6 (a) and 6 (b), a structure in which a sheath thermocouple 65 and an insulation coated conductor are embedded in the surface of the rod-like member 62 forming the rod-like member assembly 61. In this case, it is possible to use a part of the sheath thermocouple 65 such as the tip of the temperature sensing portion or the tip of the conductor as an electrode. In this embodiment, a part of the sheath thermocouple 65, such as the tip of the temperature sensing portion and the tip of the lead wire, is used as an electrode. As a result, it is possible to perform predetermined impedance measurement while maintaining functions such as temperature measurement.

  An impedance measuring device using the impedance measuring sensor according to the present embodiment can also be constructed in the same manner as in the first embodiment.

<Other embodiments>
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. The rod-shaped member, which is an existing structure, can function as an excitation electrode or a measurement electrode, and the impedance is measured using the medium between the rod-shaped members as a measurement target, and based on this, the substance at multiple points in the medium is measured. If it is a sensor which measures abundance etc., there will be no further limitation. Therefore, the fluid impedance information is obtained at multiple points in the cross-section orthogonal to the axial direction of the rod-shaped member assembly, with the fluid flowing along the axial direction of the rod-shaped member as the measurement target as in the above-described embodiments. It is not necessary to be limited to the configuration that can. Further, it is sufficient that at least one wire electrode is disposed between the rod-shaped members.

  Further, in each of the above-described embodiments, a part of the rod-shaped member 12 (the rod-shaped member 12 that is not used as an excitation electrode or a measurement electrode) is held at the same potential as the reference potential of the excitation electrode and functions as a ground electrode. However, it is not always necessary to function as a ground electrode in this way. Even if it is electrically floating, the impedance measurement intended by the present invention is possible. However, the effect of disturbance can be removed as much as possible by functioning as a ground electrode as in each embodiment, and the effect that highly accurate impedance measurement can be performed is obtained. Further, in each of the above-described embodiments, the rod-shaped member has been described as a straight line having the same diameter in the axial direction, but the present invention is not limited thereto. The rod-shaped member 12 may have any shape such as a curved material, a pipe line having an elliptical cross section, a square material, and a strip shape.

  The arrangement of the first wire electrode 13 and the second wire electrode 14 is not necessarily limited to the above embodiments. Other embodiments having different arrangement modes will be described with reference to the drawings. In addition, each figure is a schematic diagram which shows the impedance measurement sensor which concerns on each embodiment of this invention, (a) is the figure seen planarly, (b) is the figure which looked at (a) from the side. Moreover, the same number is attached | subjected to the same part as FIG. 1 etc. in both figures, and the overlapping description is abbreviate | omitted.

  The embodiment shown in FIG. 7 is a case where the rod-shaped members are in a dense array (the fast reactor and the reduced fast reactor employ such an array). In this embodiment, the first and second wire electrodes 23, 24 are slanted in accordance with the shape of the gap formed between adjacent ones of the rod-shaped members 22 forming the rod-shaped member aggregate 21. It is arranged so as to cross (for example, 60 degrees).

  In the embodiment shown in FIG. 8, the second wire electrodes 34 are arranged in parallel so as to follow the axial direction of the rod-shaped member 12. Even in such an arrangement structure, the impedance at the intersection of the first wire electrode 33 and the second wire electrode 34 caused by fluid at multiple points in the cross section orthogonal to the axial direction of the rod-shaped member 12 is measured. It is possible.

  In the embodiment shown in FIG. 9, the first electrode 44 is disposed on the outer periphery of the rod-shaped member 12 in a spiral shape.

  The embodiment shown in FIG. 10 is a case where rod-shaped members 52 having different diameters are mixed in the assembly of rod-shaped members 12. For example, a water rod mixed in a fuel cladding tube assembly in a nuclear reactor is an example. In this embodiment, when the rod-shaped member 52 is caused to function as an electrode, the first and second wire electrodes 13 and 14 are supported by the rod-shaped member 52 via an insulating member and are disposed through the rod-shaped member 52. Set up. In the case where the rod-shaped member 52 does not function as an electrode, it may be formed of an insulating member such as ceramics.

  Further, although not shown, the first and / or second wire electrodes 13 and 14 can also be used as a conductive member of a measurement probe including a thermocouple element or a thermocouple sheath material. In this case, a predetermined wire electrode can be formed by using a conductive portion of a measurement probe such as a thermocouple, and the configuration of the apparatus can be rationalized accordingly.

  The embodiment shown in FIG. 11 can reduce crosstalk in the case of the third embodiment shown in FIG. 4 in which the first and second wire electrodes are formed in multiple stages in the axial direction of the rod-shaped member. It is devised so that it can be done. Crosstalk in this case means that the signal of the impedance measurement sensor at one stage affects the signal of the impedance measurement sensor at the other stage. In this embodiment, the first and second wire electrodes 132 and 142 sandwiched between the rod-like members 12 on both sides (upper and lower sides in the figure) in the axial direction are set as the ground potential. Here, the first and second wire electrodes 132 and 142 may be used as the electrode pair for the ground potential, but independent ground electrodes may be separately provided. The shape of the ground electrode at that time may be configured in other shapes such as a flat plate as long as the influence on the behavior of the medium existing between the rod-shaped members can be minimized.

  The embodiment shown in FIG. 12 is devised so that the crosstalk can be reduced in the case of the third embodiment shown in FIG. 4 as in the embodiment shown in FIG. In this embodiment, as shown in the figure, a ground electrode 85 is provided so as to surround the impedance measurement sensor at each stage (three stages in the figure).

  In addition, it is possible to construct an impedance measurement sensor and an impedance measurement device other than those described in the above embodiments by arbitrarily combining the embodiments.

  The present invention measures the impedance caused by the fluid flowing between the rod-shaped members, which is a rod-shaped member assembly in which a large number of rod-shaped members are assembled, for example, in the industrial field handling nuclear fuel assemblies. It can be used effectively.

11 Rod-shaped member assembly 12 Rod-shaped members 13, 13A, 13B First wire electrodes 14, 14A, 14B Second wire electrodes 15, 15A, 15B Insulating portion

Claims (11)

An impedance measurement sensor for measuring a medium existing between and around a plurality of rod-shaped members,
A rod-shaped member composed of a conductive member so that the entire surface of each rod-shaped member functions as an excitation electrode or a measurement electrode;
An impedance measurement sensor comprising: a wire electrode disposed between the adjacent rod-shaped members and configured to function as a measurement electrode or an excitation electrode. The impedance measurement sensor according to claim 1,
A part of the rod-shaped member is configured to function as a ground electrode held at the same potential as a reference potential of the excitation electrode. In the impedance measurement sensor according to claim 1 or 2,
The impedance measurement sensor according to claim 1, wherein the wire electrode is composed of a plurality of wires arranged in parallel to each other. In the impedance measurement sensor according to any one of claims 1 to 3,
The wire electrode is configured by a first wire electrode and a second wire electrode that are separated from each other by a predetermined distance and intersect each other. In the impedance measurement sensor according to any one of claims 1 to 4,
The impedance measurement sensor according to claim 1, wherein the wire electrode is arranged in a plurality of positions with respect to the axial direction of the rod-shaped member. In the impedance measurement sensor according to claim 5,
An impedance measuring sensor, wherein each rod-shaped member is formed with an insulating portion for suppressing crosstalk in each axial direction. In the impedance measurement sensor according to any one of claims 1 to 6,
The impedance measurement sensor according to claim 1, wherein the wire electrode is also used as a conductive member of a measurement probe including a thermocouple element or a thermocouple sheath material. In the impedance measurement sensor according to any one of claims 1 to 7,
An impedance measurement sensor, wherein a part which is a conductive portion of a measurement probe attached to the rod-shaped member is configured to function as any one of the excitation electrode, the measurement electrode, and the ground electrode. The impedance measurement sensor according to any one of claims 1 to 8,
An arithmetic processing unit that calculates the abundances of a plurality of substances in the medium having different impedances at the measurement position based on the impedance through the medium between the excitation electrode and the measurement electrode of the impedance measurement sensor. A characteristic impedance measuring device. In the impedance measuring device according to claim 9,
An impedance measuring apparatus comprising voltage supply means for generating heat by energizing the rod-shaped member or wire electrode. In the impedance measuring device according to claim 10,
An impedance measuring apparatus comprising: a control unit configured to control so that one of a measurement mode for measuring the abundance of the medium and an energization mode for energizing the rod-shaped member or the wire electrode is selected.