JPH0560708A - Calorimeter for testing thermal vacuum - Google Patents

Abstract

PURPOSE:To achieve a highly reliable measurement by creating an accurate calibration curve with a self-calibration function. CONSTITUTION:Heaters 13 and 18 are provided in one piece on a light-reception plate 12 and a disk 15. Both of the light-reception plate 12 and the disk 15 are heated and controlled by these heaters 13 and 18 for constituting so that a calibration curve indicating a relationship with an amount of radiated heat which is suited for an environment of use, thus achieving an initial purpose.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In general, when performing a thermal vacuum test on an artificial satellite, the most basic test condition is 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 heat radiated to the satellite is installed in the satellite body, and the amount of heat radiated is measured for setting test conditions, monitoring and control.

FIG. 2 shows a conventional calorimeter for a thermal vacuum test for measuring the amount of irradiation heat, in which a disk 2 is arranged to face a light receiving plate 1 with a heat shield system 3 and a multilayer heat insulating material 4 interposed therebetween. Then, the columns 5 are connected to each other. Then, when the light receiving plate 1 is irradiated with heat, the temperature of the irradiation heat amount is measured by the thermocouple 6 provided on the light receiving plate 1. At the same time, the heat leak of the amount of irradiation heat is conducted to the disk 2 through the heat shield system 3 and the column 5, so that the heat leak amount is based on the measured temperatures of the thermocouple of the light receiving plate and the thermocouple 7 provided on the disk 2. Is detected. Then, the irradiation heat amount is controlled based on the heat leak amount detected as described above by using the heater 8 integrally provided in the light receiving plate 1 in advance, and the thermocouple 6 and the thermocouple in each heating temperature state are controlled. It is detected from the calibration curve created based on the measured temperature of 7.

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

[0005]

As described above, the conventional calorimeters for the thermal vacuum test are not satisfactory in the reliability of the measurement accuracy.

The present invention has been made in view of the above circumstances, and has a simple structure and is capable of realizing an accurate calibration curve, thereby realizing a highly reliable measurement. An object is to provide a calorimeter for vacuum test.

[0007]

According to the present invention, there is provided a light receiving plate having a solar light absorbing surface formed on one surface thereof and a heater and a thermocouple integrally formed on the other surface thereof, and the other surface of the light receiving plate. A disk provided with a heater and a thermocouple integrally formed, which are opposed to each other through a radiation heat insulation layer, a support for connecting the disk to the light receiving plate, and a support for fixedly supporting the support. A calorimeter for a thermal vacuum test is configured by including a light receiving plate, a radiation heat insulating layer, and a case in which a disk is housed.

[0008]

According to the above construction, the calibration curve showing the relationship with the amount of heat radiated in the environment of use is such that the light receiving plate is heated by the heater and the disk is heated 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. This makes it possible to create a calibration curve that suits various test conditions, and enables an accurate thermal vacuum test.

[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, 10 is a substantially cylindrical case plated with gold having a low emissivity, for example. A plurality of holding portions 10a are formed inside the case with a predetermined interval, and a support 11 is fitted to the holding portions 10a. The support 11 is made of a material having a small heat leak, and a light receiving plate 12 is fitted to one end of the support 11. The light receiving plate 12 is coated with a material having a high solar absorptivity on one surface of the front surface side, and the other surface on the back surface side thereof is coated with a heating resistor, for example, and then baked at a high temperature to be integrally formed. The heater 13 is formed. Further, on the other surface of the light receiving plate 12, a thermocouple 14 for temperature measurement is attached at a substantially central portion thereof.

On the other surface of the light receiving plate 12, a disk 15 is arranged as a heat dissipation and heat insulating layer so as to face each other with a heat shield system 16 and a multilayer heat insulating material 17 interposed 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 to a substantially central portion thereof. The disk 15 is the light receiving plate 12
And a support 11 for connection. 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 (thermal expansion, etc.) such as thermal deformation, and the fitting accuracy thereof is set. To be done.

In the above structure, when measuring the amount of irradiation heat, first of all, it is attached to a satellite body or the like (not shown) corresponding to the use environment, and a predetermined amount of current is applied to the heater 13 to heat the light receiving plate 12. .. Then, the heat supports 11.
It 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 disc 1
The temperature of No. 5 is measured by the thermocouples 14 and 19, and the heat leak amount is calculated from the measured temperature. This heat leak amount is detected at each heating temperature by variably controlling the current of the heater 13, and a calibration curve showing the relationship with the irradiation heat amount in the use environment is created. When creating this calibration curve, the disk 15 is parametrically variably controlled in temperature by applying an electric current to the heater 18 thereof in accordance with the usage environment.

Next, when performing a thermal vacuum test on the satellite body (not shown), the temperature of the light receiving plate 12 is measured by the thermocouple 14 in the environment where the satellite body (not shown) is used. The temperature of the disk 15 is measured by the thermocouple 19, and the irradiation heat amount 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
Heaters 13 and 18 are integrally provided on the light receiving plate 12 and the disk 15, and the light receiving plate 1 is provided by the heaters 13 and 18.
It is configured to have a so-called self-calibration function of heating and controlling both the disk 2 and the disk 15 to create a calibration curve showing a relationship with the amount of irradiation heat adapted to the use environment. According to this, it becomes possible to create a calibration curve that is substantially equivalent to the actual test conditions, and the accurate measurement of the irradiation heat quantity is realized, which contributes to the realization of a highly reliable thermal vacuum test.

In the above embodiment, the case where the irradiation heat quantity of the satellite is measured has been described as a representative, but 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 embodiments, and various modifications can be made without departing from the scope of the present invention.

[0016]

As described above in detail, according to the present invention, the thermal structure is simplified and the accurate calibration curve can be created, and the reliable measurement can be realized. A calorimeter for vacuum test can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a thermal vacuum test calorimeter according to an 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 plate, 13, 18 ... Heater, 14, 19 ... Thermocouple,
15 ... Disc, 16 ... Heat shield system, 17 ... Multi-layer heat insulating material.

Claims (1)

[Claims] 1. A light-receiving plate having a solar light absorption surface formed on one surface and a heater and a thermocouple integrally formed on the other surface, and a light-receiving plate opposed to the other surface of the light-receiving plate via a radiation heat insulating layer. A disc provided with a heater and a thermocouple, which are integrally formed, a support for connecting the disc to the light receiving plate, and a support fixedly supporting the light receiving plate, the radiation heat insulating layer, and the disc. A calorimeter for a thermal vacuum test, comprising: