JPS607217B2 - heat flow sensor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heat flow sensor that measures heat flow density by detecting the temperature difference between the front and back surfaces of a thermal resistor using a differential thermocouple, which is simple and extremely inexpensive. It is an object of the present invention to provide a heat flow sensor that can be manufactured and that can perform high-density measurements.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, reference numerals 11, 112 are thermal resistors made of materials with approximately the same thickness and different thermal conductivities, and these thermal resistors 11, 112 are joined so that they are lined up on the same plane. Thus, one thermal resistor 17 is formed. In addition, 12 is a planar differential thermocouple group (hereinafter referred to as a planar thermopile), and this planar thermopile 12 is prepared by preparing positive side and negative side materials in the form of plates, and by photo-etching, press processing, etc. By forming a wire row 13 and a negative wire row 14, and welding these two types of wire wire rows 13 and 14 together on the same plane, the hot junction point group r and the line contact group T2 are formed. It is something that forms. The planar thermopile 12 is arranged on one side of the thermal resistance plate 17 so that its longitudinal center line coincides with the joining line of the two thermal resistance elements 11, 112, as shown in FIG. Ru. Also, 1
5., 152 is a covering material that covers the heat resistance plate 17 from both sides,
The coating material 15 that is bonded to the surface directly in contact with the heat resistance plate 17, that is, the coating material 15 that is bonded to the surface where the planar thermopile 12 is not arranged, is a thin plate made of a material with extremely good heat uniformity, such as an aluminum plate. It will be done. On the other hand, the covering material 152 that is adhered to the surface on which the planar thermopiles 12 are disposed is a thin plate made of a heat insulating material such as polymer film or paper. ．． , 152 from both sides using an adhesive or the like to create a heat flow sensor. Furthermore, since the sensitivity of the heat flow sensor has temperature dependence, a thermocouple 16 for determining the temperature of the heat flow sensor is provided inside the heat flow sensor alongside the planar thermopile 12. This heat flow sensor is attached to the surface of a measured object (not shown), and measures the heat flow rate (heat flow density?) per unit area passing through the measured object.
is measured from the temperature difference between the same surfaces of the thermal resistors 11, 112. Note that when measuring by attaching this heat flow sensor to the object to be measured, the covering material 152 made of a heat insulating material is used.
The side may be attached to the surface of the object to be measured, or
The covering material 16 made of a heat-uniforming material may be attached to the surface of the object to be measured.

Measurement examples using the heat flow sensor configured as described above are shown in FIGS. 3a and 3b.

The heat flow sensor used here consists of two thermal resistors 11, .
112 is a magnetic rubber sheet with a thickness of about 1 side and an artificial cork sheet with a thickness of about 1 side, a covering material 15 is an aluminum plate with a thickness of 0.6 cm, and a covering material 152 is a single-sided adhesive with a thickness of about 100 mm. Chromel and constantan are used for the polymer tape and thermocouple wires 13 and 14, and a CA thermocouple is used for the thermocouple 16 incorporated to know the temperature dependence, and the planar thermopile 12 has 15 pairs of photos. A cooling thermopile is used. In addition, Fig. 3a shows the characteristics when the covering material 15 made of a heat insulating material is attached to the surface of the object to be measured, and Fig. 3b shows the properties of the covering material 15 made of a soaking material
The horizontal axis shows the CA thermocouple output (mV), and the vertical axis shows the reciprocal of the sensitivity (
It is expressed in kcal/h・mV). Since the heat flow sensor according to the present invention has a structure in which only one side of the planar thermopile is required, the manufacturing process is extremely simplified and the price can be reduced, but on the other hand, the stability of the output is somewhat deteriorated.

However, measurement is possible and has sufficient practicality. In addition, 50oo (CA thermocouple output 2mV)
The reciprocal of the sensitivity at is approximately 270k in Figure 3b.
cal/h·mV, but in the case of FIG. 3a, the sensitivity is approximately 440 kcal/h·mV under the same conditions, which is about 60% worse than in the case of FIG. 3b. Therefore, when the heat flow sensor according to the present invention is attached to the surface to be measured, it is shown that better results can be obtained in practice by attaching the covering material 15 made of a combustible material to the surface to be measured. In other words, in the case of FIG.
When measuring by attaching 2 to the surface to be measured, the material of the surface to be measured will affect the sensitivity of the heat flow sensor, so it is better to attach it as shown in Figure 3b for better results. is obtained. However, it should be noted that measurement is still possible even in the case of FIG. 3a. As described above, according to this invention,
Since a planar thermopile is used as the thermopile and the structure is such that the planar thermopile is arranged only on one side of the thermal resistor, it is possible to provide a heat flow sensor that is extremely simple to manufacture and can be manufactured at a low cost.

[Brief explanation of drawings]

Fig. 1 is a side view showing the configuration of an embodiment of the present invention in Minato style, Fig. 2 is an exploded perspective view showing the structure of the same embodiment, and Figs. It is a figure which shows the measurement example used. 11,,112...Thermal resistor, 12...
・Planar thermopile, 15,...uniform thermal coating material,
152...Insulating covering material. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A heat resistance plate formed by joining two members with different thermal resistances in a plane, and disposed on either the front or back surface of this heat resistance plate, and dissimilar metal wires centered around the joint. A group of planar differential thermocouples formed by alternately connecting wires in a zigzag pattern on the same plane, a heat insulating covering material covering the side on which the group of planar differential thermocouples is arranged, and the other surface. 1. A heat flow sensor comprising: a heat-uniforming covering material that covers a heat flux sensor;