Temperature control device for microwave multi-reflector cascade vacuum calibration test

Abstract

The invention discloses a temperature control device for a microwave multi-reflecting-surface cascade vacuum calibration test. The device comprises a cascade reflecting surface, a reflecting surface bracket, a single machine mounting plate, a radio frequency single machine system, an information processing single machine, a power distribution unit single machine, a pre-embedded heat pipe 1, a rotating mechanism, a calibration source system, an externally-pasted heat pipe, a radiation heat dissipation plate, a pre-embedded heat pipe 2, a heating sheet, a thermistor, a thermocouple and a multi-layer heat insulation assembly. According to the device, a low-expansion material and a reasonable structural design are adopted, an active temperature control design is combined to reduce the in-plane temperature gradient of a cascade reflecting surface in a vacuum environment, the influence of thermal deformation on the surface precision of the reflecting surface, a single machine is subjected to regional heat dissipation according to heat consumption, an active and passive combined method is adopted, the temperature stability requirement of the low-heat-consumption radio frequency single machine is met, and the service life of the single machine is prolonged. The device has the capability of dissipating the heat of a high-power-consumption single machine, ensures the temperature uniformity of the feed source, the bracket and the single machine mounting plate, reduces the superimposed influence of the introduction of additional thermal deformation on test indexes, and improves the precision of the test indexes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spacecraft thermal control, in particular to a microwave multi-reflector cascade vacuum calibration test temperature control device. BACKGROUND

[0002] The spaceborne microwave radiometer has important application prospects in meteorological detection, mainly receiving atmospheric microwave remote sensing detection data to obtain relevant information such as earth atmospheric cloud and surface temperature. The microwave antenna reflector, as an important component of the spaceborne microwave detection load, obtains high-accuracy reflector calibration data, which is the basis for accurately obtaining atmospheric brightness temperature remote sensing data. In order to meet the on-orbit detection requirements of the geostationary microwave radiometer, vacuum calibration tests need to be carried out during the ground development stage to obtain high-precision reflector emissivity indicators to provide basic parameters for on-orbit calibration.

[0003] In order to obtain the emissivity values of the cascade reflector under different working temperature conditions, the temperature stability of the low heat consumption radio frequency unit needs to be ensured, and the heat of the high-power unit needs to be dissipated. At the same time, in order to reduce the thermal deformation caused by the temperature non-uniformity of the reflector, it is also necessary to avoid introducing additional thermal deformation to affect the calibration accuracy of the reflector. Some existing temperature control devices cannot meet the high-precision calibration requirements of the geostationary microwave radiometer.

[0004] Therefore, the present application provides a microwave multi-reflector cascade vacuum calibration test temperature control device. SUMMARY

[0005] The present application aims to provide a microwave multi-reflector cascade vacuum calibration test temperature control device. The device adopts a combination of active and passive thermal control design, which can meet the temperature uniformity of the reflector, the temperature stability of the radio frequency unit, and the heat dissipation of the high-power unit. At the same time, the use of low-expansion materials and reasonable structural design reduces the amount of thermal deformation, which can ensure the acquisition of high-precision reflector test values in a vacuum environment.

[0006] To achieve the above-mentioned purpose, the present application provides a microwave multi-reflector cascade vacuum calibration test temperature control device, which comprises a cascade reflector, a reflector support, a unit mounting plate, a radio frequency unit system, an information processing unit, a power distribution unit, a pre-embedded heat pipe, a rotating mechanism, a calibration source system, an externally attached heat pipe, a radiation heat sink, a heating sheet, a thermistor, a thermocouple, and a multi-layer thermal insulation component.

[0007] Further, the cascade reflector comprises a first reflector and a second reflector, both of which are made of low-expansion material silicon carbide and have a low-solar-absorption and low-infrared-emissivity thermal control coating on the surface, with a profile accuracy of 10 microns.

[0008] Further preferably, the first reflecting surface and the second reflecting surface are arranged at a certain angle according to the reflecting surface modeling simulation result, with a relative position accuracy of 50 um and a relative angle installation accuracy of 0.02°.

[0009] Further preferably, the first reflecting surface and the second reflecting surface are arranged at a certain angle according to the reflecting surface modeling simulation result, with a relative position accuracy of 50 um and a relative angle installation accuracy of 0.02°.

[0010] Further, the reflecting surface support is made of invar material, and the support structure is lightweight designed, and the reflecting surface support is installed in thermal isolation with the vacuum tank large bottom plate.

[0011] Further, the single machine installation plate is composed of a low heat consumption installation plate and a high heat consumption installation plate, the low heat consumption installation plate is made of aluminum alloy 2A12, the high heat consumption installation plate is composed of an aluminum honeycomb core and an aluminum alloy skin, and the embedded heat pipe is embedded in the high heat consumption installation plate.

[0012] Further, the low heat consumption installation plate and the high heat consumption installation plate are connected through an aluminum alloy support and installed in thermal isolation on the rotating mechanism.

[0013] Further, the radio frequency single machine system includes a radio frequency front-end single machine, a radio frequency intermediate frequency single machine, a single machine support, a feed source and a feed source support, the feed source is connected with the front-end single machine, the feed source is supported and installed on the single machine low heat consumption installation plate through the feed source support, and the radio frequency single machine front-end is supported and installed in heat conduction with the single machine low heat consumption installation plate through the single machine support.

[0014] Further, the radio frequency intermediate frequency single machine, the information processing single machine and the power distribution unit are installed in heat conduction with the single machine high heat consumption installation plate.

[0015] Further, the rotating mechanism is a two-dimensional turntable, which can control the single machine system feed source aperture signal incident angle and sequentially receive cold, hot and variable temperature source radiation signals.

[0016] Further, the calibration source system is composed of a high temperature source, a low temperature source and a variable temperature source, and the three sources are installed in thermal isolation with the vacuum tank large bottom plate.

[0017] Further, the radiation signal generated by the calibration source enters the feed source through the cascade reflecting surface, and is amplified by the radio frequency front-end single machine, then filtered and detected by the intermediate frequency single machine, and then processed and packaged by the information processor single machine, and then transmitted to the tank outside test equipment through the adapter cable.

[0018] Further, one end of the external heat pipe is installed in heat conduction with the high heat consumption installation plate, and the other end is installed in heat conduction with the radiation heat sink.

[0019] Further, the radiation heat dissipation plate is composed of an aluminum honeycomb core and an aluminum alloy skin, a heat pipe is embedded in the radiation heat dissipation plate, the radiation heat dissipation plate is fixed in the high heat dissipation mounting plate through heat insulation.

[0020] Further, the heating sheet is attached to the surface of the single-machine mounting plate, the surface of the feed source and the surface of the feed source support, and the back of the design area of the cascade reflecting surface for heating and temperature control.

[0021] Further, the thermistor is attached to the surface of the feed source, the outer surface of the radio frequency front-end single-machine shell, the outer surface of the radio frequency intermediate frequency single-machine shell, the outer surface of the information processing single-machine shell and the outer surface of the power distribution unit single-machine shell for temperature measurement.

[0022] Further, the thermocouple is attached to the surface of the single-machine mounting plate and the non-radiation surface of the heat dissipation plate for monitoring temperature change.

[0023] Further, the multi-layer heat insulation assembly is wrapped around the non-working surface area of the cascade reflecting surface, the reflecting surface support, the outer surface of the single-machine mounting plate, the outer surface of the rotating mechanism, the non-radiation surface of the radiation heat dissipation plate and the outer surface of the calibration source.

[0024] Compared with the prior art, the technical scheme has the following beneficial effects: the microwave multi-reflecting surface cascade vacuum calibration test temperature control device has a compact structure and a reasonable and effective thermal control design. By selecting a reflecting surface material with a small thermal expansion coefficient and a reasonable support structure design, and by means of active temperature control, the thermal deformation caused by the temperature non-uniformity of the reflecting surface is reduced. By combining active and passive methods, and by dissipating heat from the single machines according to the heat dissipation areas, the temperature stability problem of the radio frequency single machines and the problem of dissipating heat from the high-power consumption single machines are solved. In addition, the temperature fluctuation of the feed source and the support structure in the receiving single machine system is reduced, and the influence of the rigid displacement in the microwave signal receiving link on the reflecting surface calibration accuracy is reduced. The device can ensure that the emissivity value of the high-precision cascade reflecting surface under different working temperature conditions is obtained in the ground vacuum calibration test. BRIEF DESCRIPTION OF DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 Fig. 1 is a schematic view of a microwave multi-reflecting surface cascade vacuum calibration test temperature control device; Figure 2 Fig. 2 is a view of a low heat dissipation mounting plate according to an embodiment of the present application; Figure 3 Fig. 3 is a view of a high heat dissipation mounting plate according to an embodiment of the present application; Figure 4 Fig. 4 is a view of a heat pipe embedded in the high heat dissipation mounting plate according to an embodiment of the present application; Figure 5 A schematic diagram of a radiation heat sink in an embodiment of the present application; Figure 6 A schematic diagram of one of the cascaded reflecting surfaces in an embodiment of the present application; Figure 7 A schematic diagram of another of the cascaded reflecting surfaces in an embodiment of the present application; In the figure: 1: cascaded reflecting surface; 2: reflecting surface support; 3: low heat dissipation mounting plate; 4: high heat dissipation mounting plate; 5: information processing unit; 6: rotating mechanism; 7: cold calibration source; 8: hot calibration source; 9: variable temperature source; 10: externally attached heat pipe; 11: radiation heat sink; 12: radio frequency front-end unit; 13: radio frequency intermediate frequency unit; 14: unit support; 15: feed source and feed source support; 16: power distribution unit; 17: pre-buried heat pipe 1; 18: heating sheet; 19: thermistor; 20: thermocouple; 21: multi-layer thermal insulation assembly. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described and discussed below in conjunction with the drawings of the present application. Obviously, only some of the embodiments of the present application are described here, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on the embodiments of the present application shall fall within the protection scope of the present application.

[0027] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be an intervening component. When a component is referred to as being "disposed" on another component, it can be directly on the other component or there can be an intervening component. The terms "vertical", "horizontal", "left", "right", and similar terms as used herein are for purposes of illustration only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] Reference is made to Figures 1 to 7This embodiment provides a microwave multi-reflecting surface cascade vacuum calibration test temperature control device, including: a cascade reflecting surface, a reflecting surface bracket, a stand-alone mounting plate, a radio frequency stand-alone system, an information processing stand-alone, a power distribution unit stand-alone, a pre-buried heat pipe 1, a rotating mechanism, a calibration source system, an external heat pipe, a radiant heat dissipation plate, a pre-buried heat pipe 2, a heating plate, a thermistor, a thermocouple, and a multi-layer thermal insulation component.

[0030] Specifically, the cascade reflector consists of reflectors 1 and 2, which are arranged at a certain angle and thermally insulated on a reflector bracket with a relative position accuracy of 50 μm and a relative angle installation accuracy of 0.02°. The reflector bracket is thermally insulated and mounted on the large base plate of the vacuum tank.

[0031] Specifically, the single-machine mounting plate consists of a low heat consumption mounting plate and a high heat consumption mounting plate. The low heat consumption mounting plate adopts aluminum alloy 2A12, and the high heat consumption mounting plate is composed of an aluminum honeycomb core and an aluminum alloy skin. The embedded heat pipe 1 is embedded in the high heat consumption mounting plate. Specifically, the low heat consumption mounting plate and the high heat consumption mounting plate are connected by an aluminum alloy bracket and are heat-insulated and mounted on the rotating mechanism; Specifically, the RF standalone system consists of an RF front-end standalone, an RF intermediate frequency standalone, a standalone bracket, a feed source, and a feed source bracket. The RF front-end standalone consumes a total of 10W of heat, while the RF intermediate frequency standalone consumes a total of 30W. The feed source is connected to the front-end standalone and is thermally mounted on a high-thermal-conductivity mounting plate via the feed source bracket. The RF front-end standalone is thermally mounted on a low-thermal-conductivity mounting plate via the standalone bracket. The information processing standalone consumes 50W of heat, while the power distribution unit consumes 60W of heat. The RF intermediate frequency standalone, information processing standalone, and power distribution unit standalone are thermally mounted on a high-thermal-conductivity mounting plate.

[0032] Specifically, the calibration cold source, calibration heat source and calibration variable temperature source are insulated and installed on the large bottom plate of the vacuum tank, and are distributed on the outside of the rotating mechanism at a certain angle. The rotating mechanism can control the feed port of the single-machine system to align with different calibration sources, receive the radiation signal of the calibration source, and the radiation signal generated by the calibration source enters the feed source through the cascade reflection surface and is transmitted to the RF front-end single machine for amplification, and then passes through the intermediate frequency single machine filtering and detection, and then is processed and packaged by the information processor single machine, and then transmitted to the test equipment outside the tank through the adapter cable.

[0033] Specifically, the radiant heat dissipation panel is composed of an aluminum honeycomb core and an aluminum alloy skin. A heat pipe 2 is embedded inside the radiant heat dissipation panel. The heat dissipation surface area of ​​the radiant heat dissipation panel is sprayed with thermal control white paint with high emissivity. The radiant heat dissipation panel is fixed on a high heat consumption mounting plate through polytetrafluoroethylene insulation.

[0034] Specifically, one end of the external heat pipe is heat-conductingly mounted on the high heat consumption mounting plate, and the other end is heat-conductingly mounted on the radiation heat dissipation plate.

[0035] Specifically, the multi-layer thermal insulation assembly is wrapped around the non-working surface area of the cascaded reflector, the reflector support, the outer surface of the single machine installation plate, the outer surface of the rotating mechanism, the non-radiation surface of the radiation heat sink, and the outer surface of the calibration source.

[0036] In this embodiment, the reflector material is selected as silicon carbide, the reflector back structure is designed to be lightweight, and heating sheets are pasted on the back of the reflector for temperature compensation to maintain the temperature of the reflector. Temperature data is collected by pasting thermistors, and a multi-layer thermal insulation assembly is wrapped around the back to reduce temperature fluctuations caused by the surrounding environment. The edge area of the working surface of the reflector (which does not affect the working surface) is pasted with a thermocouple for temperature measurement, and the reflector is installed on the reflector support through polytetrafluoroethylene insulation.

[0037] In this embodiment, the reflector support is made of invar material, and the support structure is designed to be lightweight. Temperature measuring thermocouples are pasted on the surface of the support, and a multi-layer thermal insulation assembly is wrapped around the surface of the support to isolate the temperature fluctuations of the support caused by the temperature changes in the vacuum tank. The reflector support is installed on the large bottom plate of the vacuum tank through polytetrafluoroethylene insulation.

[0038] In this embodiment, the feed source and feed source support, radio frequency front end, and intermediate frequency single machine and single machine support are made of 2A12 aluminum alloy material. The outer surface of the support and the outer surface of the single machine shell are black anodized, and the inner and outer surfaces of the feed source are gold plated. The feed source support and the single machine support are installed on the high thermal conductivity installation plate through the application of thermal conductive silicone grease. The outer surface of the feed source and the single machine is pasted with heating sheets for temperature compensation, and thermistors are pasted to collect temperature data.

[0039] In this embodiment, the information processor single machine and the power distribution unit single machine have high heat consumption. They are installed on the high heat consumption installation plate through the application of thermal conductive silicone grease, and the heat is transferred to the radiation heat sink through the external heat pipe for external radiation heat dissipation. Heating sheets are pasted on the outer surface of the information processing single machine and the power distribution unit single machine for temperature compensation, and thermistors are pasted to collect temperature data.

[0040] In this embodiment, the radiation heat sink area is calculated according to the single machine temperature control index and the single machine heat consumption, and the corresponding area of the radiation surface is pasted with thermocouples to monitor the temperature.

[0041] In this embodiment, a multi-layer thermal insulation assembly is wrapped around all installation plates and the outer surfaces of all single machines installed on their surfaces to reduce single machine temperature fluctuations and ensure the temperature uniformity of structural components, reducing the thermal deformation of the feed source and its support.

[0042] In this embodiment, the outer surface of the rotating mechanism, the non-radiation surface of the radiation heat sink, and the outer surface of the three calibration sources are wrapped with a multi-layer thermal insulation assembly to reduce temperature fluctuations.

[0043] The rectangular double-hole aluminum ammonia heat pipe is used in the external heat pipe in the embodiment, the heat transfer capacity of a single heat pipe can reach 300 W·m, one end of the heat pipe is installed with indium foil for heat conduction on the high heat dissipation mounting plate, and the other end is installed with indium foil for heat conduction on the non-radiation surface of the radiation heat dissipation plate.

[0044] The I-shaped double-hole aluminum ammonia heat pipe is used in the pre-embedded heat pipes 1 and 2 in the embodiment, the heat transfer capacity of a single heat pipe can reach 200 W·m.

[0045] Preferably, the heating sheet is a polyimide film electric heater.

[0046] Preferably, the temperature measuring element is a MF501 type thermistor, the temperature measuring range is -40℃~70℃, and all the cables after the thermistor wiring are connected to the collection equipment outside the vacuum tank through the tank wall plug-in connector.

[0047] Preferably, the thermocouple is a copper-constantan thermocouple (T type), the temperature measuring range is -200℃~200℃, the public freezing point method is used, all the copper wires of the thermocouple are connected to the collection board outside the vacuum tank through the tank wall plug-in connector, the constantan wire is bound in the tank and connected to a constantan wire, is connected to the outside of the tank through the tank wall hole, and the constantan wire is spot welded with the copper wire outside the tank to form a unified public point and is put into an ice bottle.

[0048] Preferably, the outermost layer of the multi-layer heat insulation assembly is a 50 μm aluminized polyimide film secondary surface mirror; the middle layer has 15 layers, including a plurality of layers of units composed of a layer of T20-A polyester mesh and a layer of 6 μm double-sided aluminum polyester film; and the innermost layer is a 25 μm polyimide film.

[0049] In summary, the device is used to carry out single machine heat dissipation and temperature control suitable for microwave multi-reflective surface cascade vacuum calibration test, the temperature uniformity of the reflective surface is maintained by means of active temperature control, the thermal deformation of the reflective surface is reduced by selecting a silicon carbide material with a small thermal expansion coefficient and a reasonable support structure design; in order to isolate the influence of the high heat dissipation single machine on the temperature stability of the low heat dissipation single machine, the active and passive heat design is used, according to the characteristics that the heat dissipation of the low heat dissipation single machine and the high heat dissipation single machine is quite different, the low heat dissipation mounting plate is designed to control the temperature stability of the radio frequency single machine to be within the range of 5℃±1℃, the high heat dissipation mounting plate is designed to transfer the heat of the information processing single machine and other high heat dissipation single machines to a certain area of the radiation heat dissipation plate through the external heat pipe, the heat is dissipated through radiation heat dissipation, and the temperature is controlled to be within the range of 15~20℃. In addition, the temperature fluctuation of the feed source and the support structure in the receiving single machine system is reduced, and the influence of the structural thermal deformation on the calibration accuracy is reduced.

[0050] The device can ensure that the emissivity value of the high-precision cascade reflective surface under different working temperature conditions is obtained in the ground vacuum calibration test.

[0051] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and one or more of the above embodiments can be combined to form an embodiment, and those skilled in the art can make various changes or modifications or combinations within the scope of the claims, which does not affect the essence of the present application. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A microwave multi-reflecting surface cascade vacuum calibration test temperature control device, characterized in that: include Cascade reflector, reflector bracket, stand-alone mounting plate, radio frequency stand-alone system, information processing stand-alone unit, power distribution unit stand-alone unit, several pre-buried heat pipes, rotating mechanism, calibration source system, external heat pipe, radiant heat dissipation plate, heating plate, thermistor, thermocouple, multi-layer thermal insulation assembly; The cascaded reflecting surface is arranged on the reflecting surface bracket, and the reflecting surface bracket is fixedly mounted on the large bottom plate of the vacuum tank; the single-machine mounting plate cooperates with the rotating mechanism, the radio frequency single-machine system and the information processing single-machine are arranged on the single-machine mounting plate, and the rotating mechanism is mounted on the large bottom plate of the vacuum tank; the calibration source system includes a cold source, a heat source and a variable temperature source, and the calibration source system is mounted around the outside of the rotating mechanism, and the multiple thermal insulation components are mounted on the large bottom plate of the vacuum tank; one end of the external heat pipe is mounted on the single-machine mounting plate, and the other end is arranged on the heat sink; the heat sink is fixed on the surface of the single-machine mounting plate.

2. A microwave multi-reflecting surface cascade vacuum calibration test temperature control device according to claim 1, characterized in that: The cascaded reflective surface includes a first reflective surface and a second reflective surface. Both the first reflective surface and the second reflective surface are made of low-expansion material silicon carbide and are coated on the surface. The surface accuracy is 10 μm.

3. A microwave multi-reflecting surface cascade vacuum calibration test temperature control device as claimed in claim 2, characterized in that: The non-working surfaces of the first reflecting surface and the second reflecting surface are pasted with heating plates and temperature measuring thermistors, the edge areas of the working surfaces of the reflecting surfaces are pasted with thermocouples, and the cascade reflecting surface is thermally insulated from the reflecting surface bracket.

4. A microwave multi-reflecting surface cascade vacuum calibration test temperature control device as claimed in claim 1, characterized in that: The single-machine mounting plate includes a low heat consumption mounting plate and a high heat consumption mounting plate. The low heat consumption mounting plate is made of aluminum alloy 2A12, and the high heat consumption mounting plate is composed of an aluminum honeycomb core and an aluminum alloy skin. The embedded heat pipe is embedded inside the high heat consumption mounting plate; the low heat consumption mounting plate and the high heat consumption mounting plate are connected by an aluminum alloy bracket and are thermally insulated and installed on the rotating mechanism.

5. The microwave multi-reflecting surface cascade vacuum calibration test temperature control device according to claim 1, characterized in that: The RF stand-alone system includes an RF front-end stand-alone, an RF intermediate frequency stand-alone, a stand-alone bracket, a feed source and a feed source bracket. The feed source is connected to the front-end stand-alone, and the feed source is supported and mounted on the stand-alone low heat consumption mounting plate through the feed source bracket. The RF stand-alone front end is supported and thermally mounted on the stand-alone low heat consumption mounting plate through the stand-alone bracket.

6. The microwave multi-reflecting surface cascade vacuum calibration test temperature control device according to claim 1, characterized in that: The radio frequency and intermediate frequency single machine, the information processing single machine and the power distribution unit are heat-conductingly mounted on the single machine high heat consumption mounting plate.

7. A microwave multi-reflecting surface cascade vacuum calibration test temperature control device as claimed in claim 1, characterized in that: One end of the external heat pipe is heat-conductingly mounted on the high heat consumption mounting plate, and the other end is heat-conductingly mounted on the radiation heat dissipation plate.

8. The microwave multi-reflecting surface cascade vacuum calibration test temperature control device according to claim 1, characterized in that: The radiant heat dissipation panel is composed of an aluminum honeycomb core and an aluminum alloy skin. The embedded heat pipe is embedded inside the heat dissipation panel. The heat dissipation surface area of ​​the heat dissipation panel is sprayed with thermal control white paint with high emissivity. The radiant heat dissipation panel is insulated and fixed on a high heat consumption mounting plate.

9. The microwave multi-reflecting surface cascade vacuum calibration test temperature control device according to claim 1, characterized in that: The heating plate is pasted on the surface of the single-machine mounting plate, the surface of the feed source and the feed source bracket, and the designed area on the back of the cascade reflector for heating and temperature control; the thermistor is pasted on the surface of the feed source, the outer surface of the RF front-end single-machine shell, the outer surface of the RF intermediate frequency single-machine shell, the outer surface of the information processing single-machine and the distribution unit single-machine shell for temperature measurement.

10. The microwave multi-reflecting surface cascade vacuum calibration test temperature control device according to claim 1, characterized in that: The thermocouple is pasted on the surface of the single-machine mounting plate and the designed heat dissipation surface area of ​​the radiation heat dissipation plate; the multi-layer thermal insulation component is coated on the non-working surface area of ​​the cascade reflective surface, the reflective surface bracket, the outer surface of the single-machine mounting plate, the surface of the rotating mechanism, the non-heat dissipation surface of the radiation heat dissipation plate, and the outer surface of the calibration source.

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