JP3090728B2 - Calorimeter for thermal vacuum test - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calorimeter for a thermal vacuum test used for measuring the amount of heat applied to a satellite body in a thermal vacuum test of an artificial satellite, for example.

[0002]

2. Description of the Related Art In general, when conducting a thermal vacuum test on an artificial satellite, the most basic test conditions are to accurately measure and control the amount of heat applied to the satellite. Therefore, in such a thermal vacuum test, a calorimeter for measuring the amount of irradiation heat to the satellite is installed in the satellite body, and the amount of irradiation heat is measured for setting, monitoring, and controlling test conditions.

FIG. 2 shows a conventional calorimeter for a thermal vacuum test for measuring such an amount of irradiation heat. A disk 2 is opposed to a light receiving plate 1 via a heat shield system 3 and a multilayer heat insulating material 4. Then, they are connected via a support 5. Then, when the light receiving plate 1 is subjected to heat irradiation, the temperature of the emitted heat is measured by a thermocouple 6 provided on the light receiving plate 1. At the same time, the heat leak of the irradiation heat is transmitted to the disk 2 through the heat shield system 3 and the support 5, and the heat leak is based on the measured temperature of the thermocouple of the light receiving plate and the thermocouple 7 provided on the disk 2. Is detected. The amount of irradiation heat is determined based on the amount of heat leak detected as described above, and the thermocouple 6 and the thermocouple in each heating temperature state controlled by using the heater 8 provided integrally with the light receiving plate 1 in advance. 7 is detected from the calibration curve created based on the measured temperature of 7.

However, in the calorimeter for the thermal vacuum test,
The calibration curve may not correspond to the actual test conditions,
There is a problem that accurate measurement is difficult. This is because it is difficult to produce an accurate calibration curve corresponding to the use environment because the temperature of the disk 2 does not correspond to actual test conditions.

[0005]

As described above, the reliability of the measurement accuracy has not been satisfactory in the conventional calorimeter for the thermal vacuum test.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simple configuration, a thermometer capable of realizing an accurate calibration curve, and realizing a highly reliable measurement. It is an object to provide a calorimeter for a vacuum test.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a light receiving plate having a sunlight absorbing surface formed on one surface and a heater and a thermocouple integrally formed on the other surface, and a light receiving plate provided on the other surface of the light receiving plate. A disk provided with a heater and a thermocouple integrally formed, a support connecting the disk to the light receiving plate, and a support fixedly supported by the support; A calorimeter for a thermal vacuum test comprises a light receiving plate, a radiation insulating layer, and a case in which a disk is accommodated.

[0008]

According to the above construction, the calibration curve indicating the relationship with the amount of heat applied in the use environment is obtained by controlling the heating of the light receiving plate by the heater and the heating of the disk by the heater.
Each heat leak amount is detected and created based on the measured temperature of each thermocouple of the light receiving plate and the disk in each heating temperature state. As a result, a calibration curve suitable for various test conditions can be created, and an accurate thermal vacuum test can be performed.

[0009]

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

FIG. 1 shows a calorimeter for a thermal vacuum test according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a substantially cylindrical case plated with, for example, gold having a low emissivity. A plurality of holding portions 10a are formed inside the case at predetermined intervals, and a support 11 is fitted into the holding portions 10a. The support 11 is formed of a material having little heat leak, and a light receiving plate 12 is fitted at one end thereof. The light-receiving plate 12 is coated with a material having a high absorptivity for sunlight on one surface on the front side, and is coated with, for example, a heating resistor on the other surface on the rear side, and then subjected to high-temperature baking to be integrally formed. A heater 13 is formed. A thermocouple 14 for temperature measurement is attached to the other surface of the light receiving plate 12 at a substantially central portion thereof.

A disk 15 is disposed on the other surface of the light receiving plate 12 as a heat radiation and heat insulating layer with a heat shield system 16 and a multilayer heat insulating material 17 therebetween. A heater 18 is integrally formed on one surface of the disk 15 facing the light receiving plate 12, and a thermocouple 19 for temperature measurement is attached at a substantially central portion thereof. The disk 15 is mounted on the light receiving plate 12.
And the support 11. Here, the support 11 has a predetermined allowable amount with respect to the light receiving plate 12 and the disk 15 corresponding to a shape change due to a physical property value such as thermal deformation (thermal expansion or the like), and the fitting accuracy is set. Is done.

In the above configuration, when measuring the amount of irradiation heat, first, the light receiving plate 12 is heated by applying a predetermined amount of current to the heater 13 by attaching it to a satellite body (not shown) corresponding to the use environment. . Then, the heat is support 11,
The light is transmitted to the disk 15 via the heat shield system 16 and the multilayer heat insulating material 17. Here, the light receiving plate 12 and the disk 1
For 5, the temperature is measured by the thermocouples 14 and 19, and the amount of heat leak is calculated from the measured temperature. The amount of heat leakage is detected at each heating temperature by variably controlling the current of the heater 13, and a calibration curve showing the relationship with the amount of irradiation heat in the use environment is created. When the calibration curve is created, the temperature of the disk 15 is parametrically controlled by applying a current to the heater 18 corresponding to the use environment.

Next, when performing a thermal vacuum test of the satellite body (not shown), the temperature of the light receiving plate 12 is measured by a thermocouple 14 in an environment in which the satellite body (not shown) is used. The temperature of the disk 15 is measured by the thermocouple 19, and the amount of irradiation heat is detected from the calibration curve created as described above based on these measured temperatures.

As described above, the calorimeter for the thermal vacuum test is
The heaters 13 and 18 are integrally provided on the light receiving plate 12 and the disk 15, and the light receiving plate 1 is
The disk 2 and the disk 15 are controlled so as to have a so-called self-calibration function of creating a calibration curve indicating the relationship with the irradiation heat amount suitable for the use environment by controlling the heating. According to this, it is possible to create a calibration curve substantially equivalent to the actual test conditions, and it is possible to accurately measure the amount of irradiated heat, thereby contributing to the realization of a highly reliable thermal vacuum test.

In the above embodiment, the case where the irradiation calorific value of the satellite is measured has been described as a representative example. However, the present invention is not limited to this, and can be applied to various structures used in a thermal vacuum environment. Therefore, it is needless to say that the present invention is not limited to the above-described embodiment, and that various modifications can be made without departing from the scope of the present invention.

[0016]

As described in detail above, according to the present invention, a simplified configuration, realization of an accurate calibration curve and realization of a highly reliable measurement can be realized. A calorimeter for vacuum testing can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a calorimeter for a thermal vacuum test according to one embodiment of the present invention.

FIG. 2 is a diagram showing a conventional calorimeter for a thermal vacuum test.

[Explanation of symbols]

10: Case, 10a: Holding part, 11: Support, 12
... light receiving plates, 13, 18 ... heaters, 14, 19 ... thermocouples,
15: disk, 16: heat shield system, 17: multilayer heat insulating material.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 25/20 B64G 7/00 G01K 17/00

Claims (1)

(57) [Claims] 1. A light-receiving plate having a sunlight absorbing surface formed on one surface and a heater and a thermocouple integrally formed on the other surface, and opposed to the other surface of the light-receiving plate via a radiation insulating layer. A disk provided with an integrally formed heater and thermocouple; a support for connecting the disk to the light receiving plate; and a support fixedly supported by the light receiving plate, the radiation insulating layer, and the disk. And a case for accommodating the thermal vacuum test calorimeter.