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.
作者
吕博
冯睿
寇伟
刘伟奇
LU BO;FENG Rui;KOU Wei;LIU Wei-qi(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)
出处
《中国光学》
EI
CAS
CSCD
北大核心
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)。
关键词
光学设计
折反射
杂散光抑制
点源透过率(PST)
optical design
catadioptric
stray light suppression
Point Source Transmittance(PST)
