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探月工程有效载荷之一的极紫外相机,可以对地球的整个离子层进行成像观测。该相机光学系统视场角14°,空间角分辨率小于0.1°。其中,超光滑反射镜是成像系统的关键部件,因此重点对反射镜及其支撑结构给出了较为详细的设计,主要考虑要满足探月工程特殊的温度、力学环境条件要求。有限元分析和环境试验结果表明,反射镜组件在-30℃～+50℃温度范围内面形精度(RMS)小于16nm,且具有足够的刚度与强度,满足力学振动条件要求。实验表明,成像分辨率满足任务要求。
The EUV camera, one of the lunar payloads, enables imaging observations of the entire Earth’s ionosphere. The camera optical system has a field of view of 14 ° and an angular resolution of less than 0.1 °. Among them, the ultra-smooth mirror is a key component of the imaging system. Therefore, a more detailed design of the mirror and its supporting structure is given. The main consideration is to meet the special temperature and mechanical environmental conditions of the lunar exploration project. Finite element analysis and environmental test results show that the surface profile accuracy (RMS) of the mirror assembly is less than 16nm in the temperature range of -30 ℃ ~ + 50 ℃, and has sufficient rigidity and strength to meet the requirements of mechanical vibration conditions. Experiments show that the imaging resolution to meet the mission requirements.