激光与光电子学进展, 2020, 57 (7): 072202, 网络出版: 2020-03-31
同轴超紧凑型主三镜一体化光学系统的设计 下载: 1137次
Design of Coaxial Ultra-Compact Primary and Tertiary Mirror Integrated Optical System
光学系统设计 同轴四反光学系统 像差理论 一体化设计 optical system design coaxial four-mirror optical system aberration theory integrated design
摘要
为解决高空间分辨率和微小卫星空间紧张之间的矛盾,基于像差理论和同轴四反光学系统,设计了一种同轴超紧凑型主三镜一体化光学系统。在焦距为1750 mm、F数为7、全视场角为1.4°的条件下对光学系统进行验证,并分析了其公差和信噪比。结果表明:光学系统的整体长度小于200 mm,仅为焦距的1/8.75,实现了光学系统的超紧凑化和小遮拦比设计。增加遮拦后,在奈奎斯特频率为78 lp/mm处,全视场传递函数优于0.26,全视场波像差优于λ/50;在太阳高度角为30°、地表反射率为0.05时,信噪比优于24.9。系统结构简单、紧凑,且成像质量良好,对微小卫星高分辨光学系统的设计有一定的借鉴作用。
Abstract
In order to resolve the contradiction between high spatial resolution and the tight space of microsatellites, a coaxial ultra-compact primary and tertiary mirror integrated optical system was designed based on the aberration theory and the coaxial four-mirror optical system. The optical system was verified under the condition of a focal length of 1750 mm, an F-number of 7, and a full field of view of 1.4°, and its tolerance and signal-to-noise ratio (SNR) were analyzed. The results show that the overall length of the optical system is less than 200 mm, which is only 1/8.75 of the focal length, suggesting an ultra-compact and small blocking ratio design of the optical system. With increased blocking, the full field transfer function is better than 0.26 and the full field wave aberration is better than λ/50 at a Nyquist frequency of 78 lp/mm. The SNR is better than 24.9 when the altitude of the sun is 30° and the surface reflectivity is 0.05. The system structure is simple and compact, and the imaging quality is good, which has certain reference for the design of high-resolution optical systems for microsatellite.
杜康, 刘春雨, 刘帅, 宋伟阳, 徐婷婷. 同轴超紧凑型主三镜一体化光学系统的设计[J]. 激光与光电子学进展, 2020, 57(7): 072202. Kang Du, Chunyu Liu, Shuai Liu, Weiyang Song, Tingting Xu. Design of Coaxial Ultra-Compact Primary and Tertiary Mirror Integrated Optical System[J]. Laser & Optoelectronics Progress, 2020, 57(7): 072202.