高光学效率可见红外共口径/视场离轴系统设计  

Design of a High Optical Efficiency Off-axial Optical System for VIS/IR with Common Aperture and FOV

作　　者：贾永丹[1,2] 孙建 聂云松[1,2] JIA Yongdan;SUN Jian;NIE Yunsong(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Beijing Key Laboratory of Advanced Optical Remote Sensing Technology,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]先进光学遥感技术北京市重点实验室,北京100094

出　　处：《航天返回与遥感》2023年第1期126-134,共9页Spacecraft Recovery & Remote Sensing

基　　金：科工局民用航天项目(D040101)。

摘　　要：针对高光学效率可见红外共口径光学系统的应用需求,基于光学效率的定义分析了影响光学系统效率的主要因素,确定了采用离轴反射式共视场光学系统实现高光学效率的技术路线。比对了可见红外共口径/视场离轴光学系统的主流构型,提出了一种共用主次镜的紧凑型全反射式离轴系统构型。给出了光学系统设计实例,其技术指标为:可见光通道焦距6 000mm,F数12.4,视场角2°×0.1°,光谱范围400~700nm,全谱段全视场调制传递函数(MTF)数值在奈奎斯特频率处(71.4线对/mm)大于0.31,相对畸变小于0.29%;红外通道焦距1700mm,F数3.5,视场角2°×0.1°,光谱范围3~5μm,冷光阑效率100%,全视场全谱段MTF数值在奈奎斯特频率处(33线对/mm)大于0.31,相对畸变小于0.73%。分析结果表明,同等技术指标条件下,文章所述共口径光学系统红外通道光学效率较复杂折反射式共口径光学系统效率至少提升40%,可解决传统离轴系统畸变较大的问题。As to the needs of the high optical efficiency optical system for VIS/IR with common aperture,based on the definition of optical efficiency, the factors affecting the optical system efficiency are analyzed, and the technical route of using off-axial reflective optical system to achieve high optical efficiency is determined.The typical configurations of the VIS/IR common-aperture/common-FOV off-axial optical system are compared, and a compact total-reflection off-axial system configuration with common primary and secondary mirrors is proposed. A design example was given. The technical indicators are as followed. For the VIS channel,the focal length, F number, field of view and the operating wave band are 6 000mm, 12.4, 2°×0.1° and 400~700nm respectively. The modulation transfer function in the pan-spectral band is above 0.31 all over the field of view at the Nyquist frequency of 71.4lp/mm, and the relative distortion is less than 0.29%. For the IR channel, the optical system focal length is 1700mm, F number is 3.5, field of view is 2°×0.1°, and the operating wave band is 3~5μm with 100% cold shied efficiency. The modulation transfer function of the system is above 0.31 all over the field of view at the Nyquist frequency of 33lp/mm, and the relative distortion is less than 0.73%. The analysis results indicate that under the same technical conditions, the optical efficiency of the infrared channel for common-aperture optical system described in this paper is at least 40% higher than the complex catadioptric optical system.

关 键 词：低畸变 共口径/视场 光学效率 离轴系统 光学设计 光学遥感 

分 类 号：TH743[机械工程—光学工程]