Fig. 1. A space environment simulation container

Fig. 2. Schematic diagram of satellite thermal test layout

Fig. 3. IR image detected through the IR window

Fig. 4. Long-wave thermal imager and cloud head

Fig. 5. Effect drawing of distribution point of thermocouple

Fig. 6. Infrared temperature measurement screen under vacuum low temperature environment

Fig. 7. Temperature contrast difference between thermal imager and thermocouple

Fig. 8. The layout diagram of the traveling-wave tube （TWT） on the cabin board

Fig. 9. The picture of the target

Fig. 10. Photo of test layout in chamber

Fig. 11. Measured infrared characteristic data. (a) Operating condition 1; (b) Operating condition 2