Fig. 1. Configuration of the SJ-9B satellite

Fig. 2. Configuration of the long-wave infrared imager

Fig. 3. Schematic diagram of heat transfer of the imager

Fig. 4. Schematic diagram of thermal control of the imager

Fig. 5. Schematic diagram of the sunshield

Fig. 6. Position of the insulation pads

Fig. 7. Installation mode of the insulation pads

Fig. 8. Schematic diagram of the cage-like straps

Fig. 9. Configuration of the cage-like straps

Fig. 10. Temperature sensor layout of the optical system

Fig. 11. Photograph of the SJ-9B satellite

Fig. 12. Temperature curve of the body tube and the primary reflector

Fig. 13. Temperature curve of the rear lens

Fig. 14. Temperature curve of the secondary reflector

Fig. 15. Temperature curve of the imager’s bracket