Design of Active Thermal Control System for Large Space Camera in Geosynchronous Orbit

Huage Hei; Xiaoyan Li; Lufang Li; Ping Cai; Rongjian Xie; Fansheng Chen

doi:10.3788/CJL230489

Chinese Journal of Lasers, Volume. 50, Issue 22, 2210002(2023)

Design of Active Thermal Control System for Large Space Camera in Geosynchronous Orbit

Huage Hei^1,2, Xiaoyan Li^3、*, Lufang Li^1,2, Ping Cai¹, Rongjian Xie¹, and Fansheng Chen^1,3

¹Key Laboratory of Intelligent Infrared Perception, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, Zhejiang, China

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Figures & Tables(14)

Fig. 1. Schematic diagram of space camera active thermal control system

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Fig. 2. Signal flow diagram of active thermal control system of space camera

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Fig. 3. Resistance-temperature curves of thermistors. (a) B6; (b) MF501

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Fig. 4. Flow chart of thermal control power off-peak function

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Fig. 5. Temperature measurement accuracy before and after calibration

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Fig. 6. In-orbit annual temperature field and temperature gradient curves of camera optical components. (a) Primary mirror; (b) secondary mirror; (c) tertiary mirror; (d) temperature gradient between mirrors

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Fig. 7. In-orbit temperature control curves of camera. (a) Optical components; (b) motion mechanism. Time step is 32 s

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Fig. 8. In-orbit thermal control power of camera. Time step is 4 s

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Table 1. Operating temperature indices of main parts of camera

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Table 1. Operating temperature indices of main parts of camera

Part of camera	Temperature range /℃	Temperature gradient /K
Primary mirror	10‒20	Single mirror：≤2； between mirrors：≤10
Secondary mirror	10‒20
Tertiary mirror	10‒20
Motion mechanism	10‒30	≤6
Compressor	-30‒20	‒
Pulse tube	-40‒20	‒
Radiator	-70‒60	‒
Baffle	<100	‒

Table 2. Temperature control strategies corresponding to different satellite power supply and orbit state information

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Table 2. Temperature control strategies corresponding to different satellite power supply and orbit state information

Orbit and power status	Temperature control strategy
Transfer orbit	Transfer orbit range
Geostationary orbit	Geostationary orbit range
Inner power（no light，battery power supply）	Safety range
Combined power（insufficient light，battery involved in power supply）	Low temperature range
External power（battery does not supply power when light is sufficient）	Normal working range

Table 3. Closed-loop temperature setpoints for camera thermal control strategy

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Table 3. Closed-loop temperature setpoints for camera thermal control strategy

Part of camera	Transfer orbit	Geostationary orbit	Heating decontamination	Safety mode	Low temperature mode
Primary mirror	0‒1	10‒12	14‒16	0‒1	0‒1
Secondary mirror	0‒1	10‒12	14‒16	0‒1	0‒1
Tertiary mirror	0‒1	10‒12	14‒16	0‒1	0‒1
Motion mechanism	-16‒-14	4‒6	11‒12	Heating off	-16‒-14
Compressor	-39‒-37	-29‒-27	-26‒-24	Heating off	-39‒-37
Radiator	-55‒-53	-50‒-48	-42‒-37	Heating off	Heating off

Table 4. Comparison of E_RMS of resistance fitted by different methods
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Table 4. Comparison of E_RMS of resistance fitted by different methods
Fitting method E_RMS
Linear polynomial 5.425
Quadratic polynomial 1.841
Cubic polynomial 1.547

Table 5. Annual temperature field of main parts of camera in orbit

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Table 5. Annual temperature field of main parts of camera in orbit

Part of camera	Temperature range index /℃	Temperature gradient index /K	In-orbit temperature /℃	In-orbit temperature gradient /K	Index satisfaction
Primary mirror	10‒20	Single mirror：≤2； between mirrors：≤10	10.7‒13.8	Primary：≤0.8； secondary：≤1.6； tertiary：≤0.7； between：≤2.8	Satisfaction
Secondary mirror	10‒20		10.4‒15.5		Satisfaction
Tertiary mirror	10‒20		11.4‒13.5		Satisfaction
Motion mechanism	5‒30	≤6	5.2‒23.7	≤5.6	Satisfaction
Compressor	-30‒20	‒	-27.9‒-4.8	‒	Satisfaction
Pulse tube	-40‒20	‒	-34.0‒-16.7	‒	Satisfaction
Radiator	-70‒60	‒	-49.7‒-26.8	‒	Satisfaction
Baffle	<100	‒	-183.5‒77.8	‒	Satisfaction

Table 6. In-orbit temperature control accuracy of main parts of camera

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Table 6. In-orbit temperature control accuracy of main parts of camera

Part of camera	Temperature control setpoint /℃	Temperature control accuracy index /K	Temperature control threshold /℃	Temperature change range /℃	Temperature control accuracy /K	Standard deviation	Index satisfaction
Primary mirror	14‒16	±1	13‒17	14.9‒15.6	Within ±1	0.2	Satisfaction
Secondary mirror	14‒16	±1	13‒17	14.8‒15.5	Within ±1	0.3	Satisfaction
Tertiary mirror	14‒16	±1	13‒17	14.5‒15.2	Within ±1	0.3	Satisfaction
Motion mechanism	11‒12	±1	10‒13	11.5‒12.1	Within ±1	0.4	Satisfaction
Compressor	-26‒-24	±1	-27‒-23	-25.3‒-24.4	Within ±1	0.4	Satisfaction

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Huage Hei, Xiaoyan Li, Lufang Li, Ping Cai, Rongjian Xie, Fansheng Chen. Design of Active Thermal Control System for Large Space Camera in Geosynchronous Orbit[J]. Chinese Journal of Lasers, 2023, 50(22): 2210002

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