地球静止轨道红外相机热控设计及验证

随着相机分辨率的提升，相机光机主体温度水平及温度稳定性要求随之提高，且红外相机需要将探测器制冷到较低温度。工作于地球静止轨道的红外相机所处空间热环境复杂，相机光学系统会长时间受到太阳照射，且无长期背阴面，为相机的热控设计带来了很大的挑战。结合地球静止轨道空间热环境特点以及相机成像需求，采用遮光罩&热门的方式有效屏蔽外部热流的影响，将主光学系统温度控制在（20±3） ℃以内，为相机每天成像时间不少于20 h提供了温度保障；采用高效隔热技术以及高效热量排散技术将探测器控制在80 K以下，满足成像模式探测器温度需求。地面试验以及在轨飞行数据表明，相机的热控设计合理可行，为后续高轨红外相机的高精度控温提供了有力支撑。

Thermal design and validation of a geosynchronous orbit infrared camera

With the improvement of the camera resolution, it is necessary to improve the temperature level and temperature stability of the main body of the camera and to cool the detector to a lower temperature for infrared camera. However, the thermal environment of the geostationary orbit space is complex, the optical system of the camera is exposed to light for a long time and there has no long-term shadow side, which brings great challenges to the thermal control design of the camera. Combined with the characteristics of the geostationary orbit thermal environment and the imaging requirements of the camera, the shield & thermal cover were adopted to effectively shield the influence of the external heat flow, so as to control the temperature of the main optical system within (20±3) ℃, which provided temperature guarantee for the camera imaging time not less than 20 h/d. The high-efficiency heat insulation technology and high-efficiency heat dissipation technology were also adopted to control the detector below 80 K, which met the temperature requirements of the detector at imaging mode. The ground test and on-orbit data show that the thermal control design of the camera is reasonable and feasible, which provides a strong support for the subsequent high-precision temperature control of the high orbit infrared camera.