折反射式空间相机光学系统设计与杂散光抑制  

Optical system design and stray light suppression of catadioptric space camera

作　　者：吕博[1] 冯睿[1] 寇伟 刘伟奇[1] LU BO;FENG Rui;KOU Wei;LIU Wei-qi(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《中国光学》2020年第4期822-831,共10页Chinese Optics

基　　金：高分专项装备预研项目(No.GFZX0403260206)。

摘　　要：针对同轴两反射镜光学成像视场角受限、大视场角下成像对比度较低的问题,采用透镜组作为像差校正组,合理分配光学系统的光焦度及间距,来扩大两反射结构的成像视场角,提升相机全视场内的成像质量。以某一工程应用需要为例,设计并研制了焦距为750 mm、视场角2ω=3.45°、全视场平均传递函数在108 lp/mm处优于0.2的相机光学系统,且在未使用主镜筒外遮光罩的前提下,优化设计了次镜遮光罩以实现杂散光抑制。采用TracePro软件进行相机杂散光环境建模仿真,结果表明:在非成像视场角内的杂散光点源透过率(PST)的量值范围为10^−3~10^−6。系统满足传统地面目标探测成像要求,验证了紧凑型大视场折反射光学杂散光抑制结构的可行性,并为商用同轴折反射光学系统设计及优化提供了一定的参考。A lens group is used as an aberration correction group to solve the limited field of view angle and low imaging contrast at a large field of view in the coaxial two-mirror optical system.The lens group adopts reasonable optical power and pitch,it expands the field of view of two-reflection mirrors and improves imaging quality in the camera's full field of view.Taking an engineering application as an example,we design and develop an optical system with a 750 mm focal length,a field of view of 2ω=3.45°,an average transfer function better than 0.2 at 108 lp/mm,and an optimized design for its secondary mirror hood that suppresses stray light without a main mirror barrel hood.Simulation stray light was optimized by using TracePro software.The results show that the stray light Point Source Transmittance(PST)in the non-imaging field of view ranges from 10^−3 to 10^−6.The system meets the requirements for traditional ground target detection and imaging,the feasibility of a compact large-field refracting optical stray light suppression structure is verified,and a certain reference for the design and optimization of commercial coaxial refracting optical systems is provided.

关 键 词：光学设计 折反射 杂散光抑制 点源透过率(PST) 

分 类 号：O436[机械工程—光学工程]