摘要
随着空间光学技术的发展,对于空间相机地元分辨率的要求越来越高,而且必须具有多光谱成像能力,因此空间相机光学系统的设计要满足视场大和畸变小的要求.本文以共轴三反射光学系统为基础,研究了一种新型的三反射光学系统.该系统不仅中心遮拦小、光学畸变低,而且实现了全色和多光谱CCD的合理排布.设计结果表明:当光学系统的焦距为f=12 000mm、F数为12、成像谱段位于450～900nm时,视场角可以达到1.6°,光学系统的线中心遮拦比低于1/3,光学畸变量小于0.5%,在50lp/mm处调制传递函数优于0.47,成像质量达到衍射极限,可以满足多光谱高分辨率空间相机对地遥感的使用需求.
With the development of space optical technology,space camera is required to be characterized by both high resolution of ground sample distance and ability of multi-spectral imaging.Thus the optical system design must be satisfied with the demand of large field of view and small distortion.Based on the on-axis three-mirror-anastigmat system,a new type of optical system was designed,which is characterized by small central obscuration,low optical distortion and reasonable arrangement of panchromatic and multi-spectral CCD.The results indicate that the field angel reaches 1.6°,the system line central obscure coefficient is lower 1/3,the optical system distortion is less than 0.5%,MTF is superior to 0.47 at 50 lp/mm,the image quality reaches the limit of optical diffraction,when the focal length is 12 000 mm,focal ratio is 12,and the spectrum band is from 450 to 900 nm.So the proposed optical system can meet the demand of high resolution multi-spectral space cameras.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2012年第1期31-35,共5页
Acta Photonica Sinica
基金
国家重点基础研究发展计划(No.2009CB724006)
西部之光(No.0929391213)资助
关键词
光学设计
空间相机
共轴三反射
全色
多光谱
Optical design
Space camera
On-axis three-mirror-anastigmat
Panchromatic
Multi-spectral
