消畸变、长焦距相机光学系统设计  

Optical System Design of Space Camera with Long Focal Length and Correction of Image Distortion

作　　者：李旭阳[1,2] 李英才[1] 马臻[1,2] 易红伟[1] 贺天兵[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710119 [2]中国科学院研究生院,北京100049

出　　处：《光学学报》2010年第9期2657-2661,共5页Acta Optica Sinica

基　　金：国家973计划(2009CB724006)资助课题

摘　　要：随着空间光学技术的不断发展,时间延时积分电荷耦合器件(TDI-CCD)相机得到了广泛的应用,TDI-CCD图像传感器的应用不仅提高了相机系统的信噪比而且使相机的光机结构更加紧凑,但光学系统的畸变在推扫过程中会造成像移,并最终导致图像模糊,因此对光学系统的设计提出了新的要求。分析了光学系统畸变对TDI-CCD推扫成像时的影响,研究了空间相机光学系统设计中消除畸变的方法,并进行了光学系统设计。设计了谱段位于450～900nm,焦距f=6000mm,F数为10的三反射消畸变光学系统。设计结果表明,当光学系统视场角为1.6°时,光学系统的畸变量小于0.01%,当面中心遮拦为0.06时,Nyquist频率(50lp/mm)处调制传递函数优于0.50,成像质量达到衍射极限,可以满足高分辨率TDI-CCD空间相机的使用要求。该光学系也适用于多光谱、立体成像和立体测绘等对光学系统畸变有严格要求的相机系统。With the development of space optical technology,time delay and integration charge coupled device （TDI-CCD） space camera has been widely applied. TDI-CCD image sensor not only improves signal-noise-ratio（SNR） of the optical system but also makes the opto-mechanical structure of the camera more compact,but the optical system distortion will affecte image quality,so the optical system design must satisfy the new demand. The optical system distortion which affects TDI-CCD integral is analyzed. The method of image distortion elimination of space camera optical system is researched. An optical system is designed with distortion correction lens which is characterized by the spectral band of 450~900 nm,focal length of 6000 mm;%98%94,and F number of 10. The result indicates that the view field angle reaches 1.6°,optical system distortion is less than 0.01%. modulation transfer function reaches 0.50 at 50 lp/mm Nyquist frequency with 0.06 central obscure,and the quality of image reaches the diffraction limit. The designzd optical system can meet the demand for the use of high resolution space cameras,and is suitable for multi-spectrum,stereo imaging,and stereo mapping camera system which has little distortion.

关 键 词：光学设计 空间相机 三反消像差光学系统 长焦距 消畸变 

分 类 号：TH703[机械工程—仪器科学与技术]