JPS6363057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring surface temperature using a surface contact thermometer, and more specifically, a method for measuring surface temperature using a surface contact thermometer. The present invention relates to a surface temperature measurement method that improves the accuracy of temperature measurement by controlling the posture of the surface.

Conventionally, a thermocouple that forms the temperature detection end of a surface contact thermometer is manufactured by joining the ends of a thin strip-shaped thermocouple wire 1 having restoring elasticity to a base 2a, as shown in FIG.
As shown in FIG. 2A, this is pressed against the object to be measured 3 to measure its surface temperature. When measuring the temperature of the object to be measured 3 using such a temperature detection end 2, if the thermocouple wire 1 is always in close contact with the object to be measured 3 as shown in Figure 2 A, reliable measured values will be obtained. However, if the thermocouple wire 1 does not come into close contact with the object to be measured 3 and the hot junction and its vicinity are in incomplete contact with the object to be measured 3, as shown in Figure 2 B and C, the measurement will be difficult. Of course, values are not trustworthy.

Therefore, the conventional temperature detection end 2 is usually equipped with a stopper 2.
b is provided so that the thermocouple wire 1 is brought into contact with the object to be measured 3 with an appropriate pressing force and is brought into contact with the object to be measured 3 in the correct posture.

However, even if the stopper 2b is provided in this way, there is no way to check whether the thermocouple wire 1 is in proper contact with the object to be measured, and with this conventional measurement method, it is difficult to check whether the obtained temperature value is correct. The drawback is that it is not possible to evaluate whether it is correct or not.

Furthermore, if the stopper is large, the surface temperature will be absorbed by the stopper, making it impossible to measure the correct surface temperature, while if the stopper is small, it will be difficult to take a correct measurement posture.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional drawbacks and to provide a surface temperature measurement method with high measurement accuracy that allows the user to take a correct temperature detection posture even without a stopper. A multiple-end detection element is provided at the temperature detection end of the thermometer,
The present invention is characterized in that the surface temperature of the object to be measured is measured by correcting the attitude of the temperature sensing end so that the output values from the respective sensing elements all approach the same value.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 3 to 6 show examples in which the surface contact thermometer used in the measuring method of the present invention is composed of thermocouples. FIG. 3 is a cross-sectional view of the temperature measuring section 4 when its temperature detecting end is brought into contact with the object to be measured 3, and the structure in which thermocouple materials 6 and 7 are laminated with an electrical insulating layer 5 interposed therebetween is shown in this embodiment. has. FIG. 4 is a view of the portion of the temperature measurement section 4 in FIG. 3 that comes into contact with the object to be measured 3 as seen from the arrow A, and shows a thermal junction 8 formed of thermocouple materials 6 and 7. Figure 5 is B of Figure 4.
The cross-sectional view taken along line -B shows that there are three rows of thermocouple material 7 on which another type of thermocouple material 6 is stacked with an electrical insulating layer 5 in between. 6th
The figure is an enlarged side sectional view of the thermal junction 8 of FIG. 4, and the thermal junction 8 is constituted by thermocouple materials 6 and 7.

In this embodiment, three hot contacts are arranged diagonally at the temperature detection end, but the surface temperature measuring method of the present invention requires at least two such hot contacts, and preferably three or more. The reason for this is that in the surface temperature measurement method of the present invention, the thermal junctions at the temperature detection end are not arranged to measure a scalar quantity, but are arranged in plural to measure the temperature gradient, that is, the vector direction of the temperature. Since the posture of the temperature sensing end is controlled so that
This is because it is desirable to be able to evaluate the surface using more than 100 pieces.

Next, a method for measuring surface temperature of the present invention using a temperature detection end having three thermal junctions configured as described above will be described.

In Fig. 7A, the measured temperature at each point of the three thermal junctions a, b, and c provided in the temperature measuring section 4 at the temperature sensing end is shown by the broken line shown in B when the temperature measuring section 4 is in a normal contact state. They are lined up on C, but the thermal junction c is as shown in Figure 7 A.
When the side is not in sufficient contact with the object to be measured 3, a large difference in electromotive force between a and b and between b and c, that is, a temperature difference, is observed as shown by the x mark in b.

Therefore, due to the temperature difference between the thermal junctions a, b, and c, the asymmetry of the contact in the length direction of the ribbon wire at the temperature sensing end is detected, and as shown in FIG. On the other hand, even when the ribbon wire 4c with the hot junction c is floating, a difference in the measured temperature of each hot junction is observed as shown in Figure 8 (b), so contact asymmetry in the cross-sectional direction of the ribbon wire can also be detected. be done.

The amount of asymmetry detected in this way can be quantified, and if this is fed back to the measurement system and the attitude of the temperature sensing end is corrected so that the measured temperature at each hot junction is the same, correct measured values can be obtained. Obtainable. In this example, the case where there are three hot junctions has been described, but if there are more hot junctions, the amount of information obtained will increase, and the accuracy of measurement will further improve.

The purpose of the present invention is to provide a method for measuring surface temperature with high accuracy, and for this purpose, it is sufficient to provide a method for bringing the temperature detection end into contact with the object to be measured in the correct posture. Detection of the posture of the end does not need to be performed using a surface contact thermometer using multiple hot contacts; it may also be performed by arranging multiple thermistors or pressure detection elements around a single hot contact surface contact thermometer. .

As explained above, the present invention provides a plurality of detection elements at the temperature detection end of a surface contact thermometer, detects the attitude of the temperature detection end during temperature measurement, and measures the temperature detection end from the obtained information. By optimizing the posture during heating and measuring the surface temperature of the object to be measured,
This has the effect of obtaining surface temperature with high measurement accuracy.

In particular, as shown in FIGS. 3 to 6, the detection terminals are used as thermal contacts and are arranged closely on the thermocouple wires on a thin strip with restoring elasticity, and placed on the outside of the base as shown in FIG. If the rack is curved, as mentioned above, the correct measurement posture can be achieved using only this thermocouple wire, so a stopper is no longer necessary, and the conventional stopper does not absorb heat from the surface of the object to be measured, allowing accurate surface temperature measurement. There is an effect that it can be done.

Furthermore, with conventional temperature detection terminals equipped with stoppers, the pressure force exerted by the stopper acts in addition to the pressing force against the surface of the measured object by the thermocouple wire, so the surface temperature of the measured object cannot be applied with pressure. Although it was not possible to measure accurately, the temperature detection end of the present invention can measure the accurate temperature simply by lightly touching the surface of the object to be measured without a stopper, so the range of the object to be measured can be expanded. There is an advantage.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the temperature detection end of a conventional surface contact thermometer, and Fig. 2 A, B, and C show the contact state of the contact part of the temperature detection end with the object to be measured. 3 is a sectional view of the temperature measuring section when the temperature detection end of the present invention is brought into contact with the object to be measured, FIG. 4 is a view taken in the direction of arrow A in FIG. 3, and FIG. The figure is a cross-sectional view taken along line B-B in Figure 4, Figure 6 is an enlarged side cross-sectional view of the thermal junction in Figure 4, Figures 7 A and B and Figure 8 A and B are temperature sensing terminals of the present invention. FIG. 2 is a side view of a contact portion, an obtained data diagram, a cross-sectional view of the contact portion, and an obtained data diagram showing a state in which the surface temperature of a measured object is measured by the method. 4... Temperature measurement section, 5... Electrical insulation layer, 6, 7...
Thermocouple material, 8, a, b, c...thermal junction.

Claims (1)

[Claims] 1 A plurality of detection elements are provided at the temperature detection end of a surface contact thermometer, and the attitude of the temperature detection end is corrected so that the output values from each detection element all approach the same value, and the surface of the object to be measured is adjusted. A surface temperature measurement method that measures temperature.