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为了让空间相机在适合的温度条件下工作,提出一种基于温度水平的主动热控系统。首先,分析相机达到温度平衡的条件,确定主动热控策略;其次,介绍热控系统的构成及工作原理;然后,将相机图像质量无本质影响作为条件,确定主动热控策略中的各项控温指标;最后,确定温度控制算法。相机在轨工作的实验结果表明:依据主动热控策略,系统能够控制相机温度达到平衡,主镜组件与基准温度的温差不大于1℃,主镜组件的周向温差不大于1℃,主镜与次镜组件的温差不大于2℃,主镜与三镜组件的温差不大于5℃,温度控制结果满足主动热控策略中的各项控温指标要求,满足相机工作时对温度的要求。
In order to make the space camera work under suitable temperature conditions, an active thermal control system based on temperature level is proposed. Firstly, the condition that the camera reaches the temperature balance is analyzed to determine the active thermal control strategy. Secondly, the structure and working principle of the thermal control system are introduced. Then, the intrinsic quality of the camera image is taken as the condition to determine the control of the active thermal control strategy Temperature index; Finally, determine the temperature control algorithm. Experimental results show that the system can control the temperature of the camera to reach a balance, the temperature difference between the main mirror assembly and the reference temperature is not more than 1 ℃, the circumferential temperature difference of the main mirror assembly is not more than 1 ℃, and the main mirror The temperature difference between the primary mirror and the secondary mirror component is not more than 2 ° C. The temperature difference between the primary mirror and the triple mirror component is not more than 5 ° C. The temperature control result meets the requirements of various temperature control indexes in the active thermal control strategy to meet the temperature requirement during the camera work.