JPS6047545B2 - Radiant heat measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiant heat measuring device that measures radiant heat emitted from the surface of an object.

When measuring radiant heat emitted from the surface of an object, it is effective in terms of sensitivity to first converge the heat energy with a concentrator and then sense it with a temperature sensor such as a thermocouple.

As a sensor used at this time, a thermopile having a plurality of thermocouples connected in series is generally used to increase superpower.

Figure 1 shows the principle diagram of the radiant heat measuring device, where A is the thermopile, B is the hot junction, C is the cold junction, D is the compensating conductor, E is the radiant energy, and F is the converging lens. The radiant energy E emitted from the object to be measured is focused on the thermal junction B by the lens F, and the superpower generated in the thermopile A is extracted from the compensating conductor D.

However, in such a conventional example, as shown in FIG. 1, the cold junction (reference temperature junction) C is exposed to the atmosphere, so the temperature of the junction constantly changes, and therefore the electromotive force of the thermopile A also increases. It will change accordingly.

Therefore, it is necessary to constantly measure the temperature of the cold junction C and correct the superpower from the thermopile A, which is a very troublesome task. Of course, it is also possible to keep the cold junction C at a constant temperature by storing it in a thermostat containing ice, etc., but the cold junction C
If the number of thermostats is large, the number of thermostats must be increased accordingly, which increases the amount of work required to maintain the temperature of the thermostats themselves, which increases complexity and lacks maneuverability. A difficulty had arisen.

SUMMARY OF THE INVENTION An object of the present invention is to provide a radiant heat measuring device that can eliminate the above-mentioned difficulties.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 3, reference numeral 1 denotes a metal container to be filled with distilled water 24, and the material is made of a material with a thermal conductivity so that the cold junction of the thermoelectric pile (described later) is maintained at almost the same temperature as the inside of the container 1. Only good quality is used.

Reference numeral 2 denotes a bellows attached to the metal container 1, and the bellows and the container 1 are in communication with each other through a communication hole 3 formed in the container 1.

Reference numeral 4 denotes a microswitch, which is provided in the direction of expansion and contraction of the bellows 2, and the distance between the bellows and the switch 4 is set so that it can come into contact with the switch 4 when the bellows 2 is expanded, as will be described later. .

6 is a thermoelectric element, 7a and 7b are insulating materials, and 8 is a radiation fin.The thermoelectric element 6 is for forced cooling of the metal container 1 as described later, and is attached to the container 1 via an insulating material 7a. radiating fins 8 via the insulating material 7b.
is provided on the outer periphery of the thermoelectric element 6.

9 is a thermoelectric stack, and as shown in Fig. 2, a plurality of thermocouples 9
a, 9b, 9c... are thermal contacts 9a'', 9b''
, 9C''... are arranged radially around the center and connected in series, and the cold junctions 10 and 1'' at both ends are connected to the compensating conductors 10a and 10b, respectively.
Electromotive force is extracted from 0b.

The thermopile stack 9 configured in this way is attached to the metal container 1, and the cold contacts 9a'', 9b'',
9C''... is fixed by a set screw 13 through an insulating material 12 around a recess 11 formed in the outer wall of the container 1.Thermal junction is the central part of the thermoelectric stack 9. 9a″,
9b'', 9C''... are the free ends of the recess 11
It is located within the recess and is spaced apart from the bottom surface 14 of the recess.

5 is a converging lens, and the radiant heat (radiant energy) radiated from the surface of the object to be measured (not shown) is converged by the converging lens and converged onto the center of the thermoelectric pile 9.

In addition to lenses, concave mirrors, conical mirrors, etc. are used as means for converging the radiant energy.

The bottom surface 14 of the recess 11 is coated with a reflective paint that reflects radiant heat, such as silver plating, thereby reducing the temperature rise in the metal container 1 due to the radiant heat.

15 is a case for storing the metal container 1;
17 is a cooling fan, 17 is a circulation port for air taken in from the fan, and 18 is a discharge port for discharging the air inside the case 15.

The metal container 1 has a support frame 19 formed inside the case 15.
is held through a heat insulating material 20.

Note that 21 is a DC power supply for supplying DC current to the thermoelectric element 6, and the thermoelectric element 6 and the power supply constitute a DC circuit 2, and the microswitch 4 connects the circuit to 0N-
It is connected to turn off. A recorder 22 is connected to the cold junctions 10, 1' of the thermopile 9, and records the electric power generated in the thermopile 9.

23 is an AC power source for the cooling fan.

The operation will be explained below based on the above configuration.

When used, the inside of the metal container 1 is in a state of distilled water 24,
In this state, the bellows 2 is separated from the microswitch 4, the DC circuit 2 consisting of the thermoelectric element 6 and the DC power supply 21 is at 0N, and the container 1 is powered by the thermoelectric element 6. The air is cooled, and the cooling fan 16 also operates, and the air taken in through the flow opening 17 removes heat from the radiation fins 8 and flows out through the discharge opening 18.

In this way, the temperature of the distilled water 24 inside the metal container 1 decreases, and gradually begins to freeze 25 on the inner wall of the metal container 1. The water pressure inside the bellows 2 increases due to volumetric expansion due to freezing, and the bellows extends in the direction of the microswitch 4, and when the inside of the container 1 reaches an equilibrium coexistence state of ice and water, it comes into contact with the microswitch 4, and the above-mentioned The series circuit 2' becomes 0FF, and at the same time, the operation of the fan 16 also stops.

This state is maintained for a while, and after a certain period of time, the ice in the container 1 begins to melt, the bellows 2 separates from the microswitch 4, and the series circuit 2 becomes 0N.
As cooling by the thermoelectric element 6 begins, the cooling fan 16
also works.

Such an operation is constantly repeated during use, and the inside of the container 1 is always maintained at 0°C.

Since the container 1 is made of metal, it has good thermal conductivity,
Therefore, the cold junctions 9a'', 9b'''', 9C'' of the thermoelectric pile 9...
. . . are always held at zero.

As described above, the present invention includes a metal container filled with distilled water, a means for cooling the container and maintaining the container in an equilibrium coexistence state of water and ice, and a cold junction of a thermoelectric pile. is attached to the metal container via an insulating material, the cold junction is always held at zero without being affected by atmospheric temperature, and therefore the superpower from the thermopile is not compensated for in any way. It becomes possible to read it as a measurement value. In addition, there is no need to change the number of thermostatic chambers depending on the number of cold junctions.
``Mobility and discretion become greater.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a longitudinal cross-sectional side view showing the principle of a conventional measuring device, FIG. 2 is a plan view of a thermopile used in the device according to the present invention,
FIG. 3 is a longitudinal sectional view of the device according to the invention. 1... Metal container, 5... Converging lens,
9...Thermoelectric stack, 9a'', 9b'', 9C''...
...Cold junction, 20...Insulating material.

Claims (1)

[Scope of Claims] 1. A device comprising a concentrator that converges radiant heat emitted from the surface of an object to be measured, and a thermopile composed of a plurality of thermocouples connected in series, and a thermal junction of the thermopile condenses the radiant heat. A radiant heat measurement device placed at a convergence point includes a metal container filled with distilled water and a cooling means for cooling the container to maintain an equilibrium coexistence state of water and ice inside the container. A radiant heat measuring device characterized in that a cold junction is attached to the metal container via an insulating material. 2. A recess is formed in the outer wall of the metal container, and the cold junction of the thermopile is attached to the outer wall surrounding the recess, and the hot contact is located within the recess and spaced from the bottom surface of the recess. A radiant heat measuring device according to claim 1. 3. Radiant heat measurement according to claim 2, characterized in that the thermal junction of the thermopile is located between the concentrator and the bottom of the recess, and the bottom is coated with a reflective paint that reflects radiant heat. Device.