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设计了一个无运动部件、结构紧凑并实现两档焦距的折反射混合式空间光学系统。长、短焦前组共用一个Ritchey-Chrétien(R-C)反射系统,使用分光棱镜对光路分光,由两路后组透射系统对前组进行缩放实现两档焦距。长焦焦距为4700 mm,F数为13.4,短焦焦距为2350 mm,F数为6.7。在光机设计上,还考虑了对温度变化敏感的间隔使用热膨胀系数小的材料;为了减小反射镜面形变化,采用了热性能好的材料作为反射镜基底,并对相机在空间环境下温度变化在(19±3)℃范围内进行了像质分析,设计结果能满足使用要求。
A fold-reflective hybrid spatial optical system with no moving parts, compact structure and two-stage focal length is designed. In the long and short focal lengths, a Ritchey-Chrétien (R-C) reflection system is used in common. The beam splitter is used to split the optical path, and the two groups of rear transmission systems zoom the front group to achieve two-stage focal length. The telephoto focal length is 4700 mm, the F number is 13.4, the short focal length is 2350 mm and the F number is 6.7. In the design of the light machine, the material with small thermal expansion coefficient is also considered in the interval of temperature change. In order to reduce the change of the mirror surface shape, a material with good thermal performance is used as the mirror base, and the temperature of the camera in the space environment Changes in the (19 ± 3) ℃ range of image quality analysis, design results to meet the requirements.