多光谱遥感相机光学系统设计

Optical System Design of Multispectral Space Camera

设计了谱段位于450～900nm,焦距f=6 000mm,F数为10的大F数、矩形视场、长焦距的折轴三反光学系统.光学系统视场角为1.6°,光学系统的畸变优于0.5%,中心面遮拦为6%时,Nyquist频率（25lp/mm）处各谱段调制传递函数优于0.65,整个光学系统成像质量达到衍射极限.同时根据所采用的多光谱时间延迟积分CCD分析了相机各谱段的静态调制传递函数,可以满足多光谱遥感相机的设计使用要求.

The reflective optical system which is characterized by the spectrum hand 450 ~ 900 nm, focal length of 5 000 mm and F number of 10 was designed. The result indicates that the field angle reaches 1. 6°,optical system distortion is less than 0. 5%. Modulation Transfer Function （MTF） reaches 0. 65 at Nyquist frequency（25 lp/mm） with 6% central obscure, the quality of image reaches the diffraction limited. At the same time,the paper studies the static MTF of all spectrums based on using time delayed integration CCD. So this kind of optical system can meet the demand for the use of multispectral space cameras.