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随着Skysat-1卫星的成功发射,高分辨率视频相机是目前竞相开发的卫星有效载荷。为降低成本、适应小卫星平台,亟需设计与研制体积小、重量轻、易实现、能对面视场成像的长焦距光学系统。研究与设计了适于面视场成像的全视场同轴三反望远物镜,解决其固有的二次遮拦和像面引出困难等问题。由近轴几何光学理论,导出消除二次遮拦的条件和系统总长与三镜中继成像倍率的关系,讨论并得到合理的三镜中继成像倍率等参数。利用出瞳附近处的平面镜,无遮拦地引出像平面,同时用平面镜组折叠光路,减小系统总长。给出了确定初始结构参数的方法与结果,优化设计得到了有效焦距、视场角、F数分别为10m、1.1°×1°、14.3的无二次遮拦光学系统,其总长约为有效焦距的1/8,成像质量接近衍射极限。
With the successful launch of the Skysat-1 satellite, high-resolution video cameras are the satellite payloads currently under development. In order to reduce costs and adapt to the small satellite platform, it is urgently necessary to design and develop a long focal length optical system that is small in size, light in weight, easy to implement and capable of imaging the opposite field of view. Research and design of the full field of view for the field of field imaging three telescope objective lens to solve its inherent secondary obstruction and image plane extraction difficulties and other issues. Based on the theory of paraxial geometry optics, the conditions of eliminating secondary occlusion and the relationship between the total length of the system and the imaging power of the three-mirror relay are deduced. The reasonable parameters such as imaging magnification of the three-mirror relay are discussed and discussed. Using the exit mirror near the plane mirror, straight out of the image plane, while the flat mirror group folding optical path, reducing the total length of the system. The method and result of determining the initial structural parameters are given. The optimal focal length, the field of view, and the F-number of non-quadratic optical system with the F numbers of 10m, 1.1 ° × 1 ° and 14.3 respectively are obtained. The total length is approximately the effective focal length 1/8, the image quality close to the diffraction limit.