一种新型微小视频卫星光学系统设计

基于Ritchey-Chretien （R-C）光学系统，采用Zemax软件设计次镜为类曼金反射镜的折反射式光学系统。系统的焦距为3 000 mm，视场角为1，相对孔径为1/8，工作谱段为450 nm~900 nm。结果表明，截止频率为50 lp/mm处的MTF值为0.55，接近衍射极限，畸变小于0.022%。类曼金镜的非球面反射面与主镜构成R-C光学系统，消除了系统的球差和彗差，折射面分担次镜的光焦度，减小了非球面的非球面偏心率。类曼金反射镜的加入，将次镜非球面偏心率的平方由4.356减小到1.940，而且系统总长度由600 mm减小到550 mm。

Design of new type of micro video-capable satellite optical system

Based on the Ritchey-Chretien(R-C) system, a refractive/reflective system with a Margin-like mirror and 3 correcting lenses in front of the focal plane was designed with the help of Zemax software. It has a focal length of 3000mm, F number of 8, waveband of 450nm~900nm, and the field of view reaches 1. It is shown that the value of modulation transfer function(MTF) is higher than 0.55 at 50 lp/mm, the image quality reaches the diffraction limit,and the distortion is less than 0.022%. An R-C optical system is made up of the aspheric mirror of the Margin-like mirror and the primary mirror of the system without the spherical aberration and the coma aberration. The refractive surface of the Margin-like mirror shares the optical power of the secondary mirror, reducing the asphericity of the aspheric mirror. Results show that the Margin-like mirror can lessen the square asphericity of the secondary mirror from 4.356 to 1.940, and reduce the length of the system from 600 mm to 550 mm.