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针对广角极光成像仪对其光学系统温度的特殊需求,对成像仪使用的高温滤光片进行了热设计及相关试验。介绍了广角极光成像仪的光机结构,尤其是滤光片组件的结构。通过建立传导和辐射热阻的计算方程组,分析了由滤光片到镜筒整个换热路径中存在的热阻及其影响因素。然后,以影响热阻的因素作为设计变量,分析了影响镜筒温度的敏感变量。最后,提出了高温滤光片的热设计方案。真空验证试验表明:在高温和低温两种极端工况下,滤光片温度水平分别稳定在105.8℃和138.2℃,其控温准确度优于±2.5℃,控温稳定度优于0.75℃/min;反射镜组和探测器窗口温度水平和温差都满足热控指标。得到的结果显示,基于热阻和温度灵敏度分析的设计方法,能够快速明确影响热阻的敏感设计变量,减少设计过程的盲目性。空间高温滤光片的热设计满足了光学系统的要求,保证了广角极光成像仪滤光片组件与反射镜之间的温差。
Aiming at the special needs of the wide-angle aurora imaging system for its optical system temperature, the thermal design and related experiments of the high-temperature filter used by the imager are carried out. The structure of the light machine of the wide-angle aurora imager is introduced, especially the structure of the filter assembly. The thermal resistance and its influencing factors existing in the entire heat transfer path from the filter to the lens barrel were analyzed by establishing the equations of calculation for the thermal conductivity and radiation resistance. Then, taking the factors affecting the thermal resistance as the design variables, the sensitive variables that affect the temperature of the lens barrel were analyzed. Finally, the thermal design of high temperature filter is proposed. The results of vacuum verification show that the filter temperature is stable at 105.8 ℃ and 138.2 ℃ under the high temperature and low temperature conditions, the temperature control accuracy is better than ± 2.5 ℃ and the temperature stability is better than 0.75 ℃ / min; Mirror group and detector window temperature level and temperature are to meet the thermal control indicators. The results obtained show that design methods based on thermal resistance and temperature sensitivity analysis can quickly identify sensitive design variables that affect thermal resistance and reduce the design process’s blindness. The thermal design of the spatial high-temperature filter meets the requirements of the optical system and ensures the temperature difference between the wide-angle aurora imager filter assembly and the mirror.