Infrared and Laser Engineering, Volume. 50, Issue 9, 20210056(2021)
Thermal design and validation of a geosynchronous orbit infrared camera
Figures & Tables(13)
Fig. 7. Temperature comparison of main optical system with different schemes
Table 1. Internal heat source distribution of the camera
View tableView in ArticleTable 1. Internal heat source distribution of the camera
Components Heat load/W Working time Optical path switching and focusing motor, etc 15 Short time (1-2 min/d) Focal plane circuit box 2 Long time (>20 h/d) Video processor 18 Long time (>20 h/d) Power box 15 Long time (>20 h/d) Refrigerator 50 Long time (>20 h/d) Shimmer focusing and circuit box 10 Short time （<5 min/d）
Table 2. Temperature demand of the camera components
View tableView in ArticleTable 2. Temperature demand of the camera components
Components Temperature requirement Survival case/℃ Imaging case/℃ Baffle ≤100 ≤100 Main bearing structure >0 20±3 Main optical system >12 20±3 Rear optical system >12 20±5 Hot end and compressor of the refrigerator −20-23 −20-23 Video processor and power box −20-55 −20-55 Shimmer circuit box 0-50 0-50 Thermal cover mechanism 0-70 0-70
Table 3. Ground test cases
View tableView in ArticleTable 3. Ground test cases
Cases Space heat flow Boundary Working mode Survival case 0 Low temperature Survival mode，all the heat sources are off Low temperature case Initial stage of vernal equinox Low temperature Standby mode, only the refrigerator is on High temperature case Final stage of summer solstice High temperature Imaging mode, all the heat sources are on
Table 4. Temperature date of ground test and on- orbit
View tableView in ArticleTable 4. Temperature date of ground test and on- orbit
Components Transfer orbit (Survival mode) Geosynchronous orbit Ground test temperature/℃ On-orbit temperature/℃ Ground test temperature/℃ On-orbit temperature/℃ Main mirror 13.59-13.62 13.5-13.9 17.75-19.91 17.7-20.6 Secondary mirror 14.2-14.22 14.3-14.6 18.68-20.08 18.5-21.5 Main bearing structure 15.02-15.33 15.1-15.3 20.01-21.99 20.0-20.7 Rear optical system 13.8-14.2 14.3-14.4 18.6-20.6 19.2-20.0 Compressor −2.37- −2.35 −2.8- −2.5 5.44-8.44 3.5-6.5 Hot end −3.58- −3.56 −4.16- −3.9 8.33-13.05 4.9-6.8 Video processor −3.17- −3.15 −3.2- −2.8 1.95-14.52 1.5-13.5 Power box −4.1- −4.0 −4.0- −3.9 1.12-6.73 0.6-5.4 Shimmer circuit box 14.7-14.9 14.5-14.7 19.79-27.67 19.4-27.5 Thermal cover mechanism 4-14 6.7-12.7 10.2-24.1 8.0-22.1
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Nana Xu, Feng Yu, Zhenhua Zhou. Thermal design and validation of a geosynchronous orbit infrared camera[J]. Infrared and Laser Engineering, 2021, 50(9): 20210056
Paper Information
Category: Infrared technology and application
Received: Jan. 24, 2021
Accepted: --
Published Online: Oct. 28, 2021
The Author Email: Yu Feng (njlgyufeng@163.com)
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