应用波前编码技术的离轴三反系统的设计及其分析  

Application of wavefront coding technology on TMA system

作　　者：闫锋[1,2] 张学军[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所光学技术研究中心,吉林长春130033 [2]中国科学院研究生院,北京100084

出　　处：《红外与激光工程》2008年第6期1048-1052,共5页Infrared and Laser Engineering

基　　金：国家杰出青年基金资助项目(69925512)

摘　　要：波前编码技术是一种新兴的"光学-数字"一体化成像技术,可以在保持光学系统相对孔径不变的情况下扩展其焦深,并控制与离焦有关的像差。这一特性使得该技术在空间相机上的应用有着广阔的前景。讨论了波前编码技术在空间用离轴三反光学系统上的应用,通过建立以次镜为波前编码元件的过渡模型给出了光学设计的结果,并以调制传递函数(MTF)为评价尺度对传统系统和应用波前编码技术的新系统的成像特性进行了对比;同时讨论了焦深扩展因子对系统焦深扩展程度以及成像质量的影响。分析结果证明了波前编码技术在空间光学系统上的巨大应用价值。The wavefront coding technology （WFC） is an innovative technology that joints the optical design and digital image processing together. The optical system with the WFC technology becomes very insensitive to the defocus aberration and other aberrations related defocus while the relative aperture keeps the same. The depth of focus can be extended by means of WFC technology. The characteristic of this technology is extremely attractive on space camera. As known, it is difficult to maintain focal plane position of space-borne camera within its depth of focus because of the severe working condition. Plenty of technique is employed to control defocus and defocus-related aberrations due to launch shock and thermal loading in orbit. That the application of WFC on TMA system for space-borne camera was presented. A new feasible way to solve these problems was provided. A transition model was established to redesign the optical system, in which the secondary mirror was selected to be the wavefront coded element. It is shown that the defocus is truly extended by the MTF comparison between the traditional system and the innovative system adopting WFC. A DOF extending factor was defined and its effect on wavefront coded system was also discussed. It can be concluded that WFC technology provides with great potential on improving the robust of space optical system.

关 键 词：波前编码 次镜 焦深 光瞳函数 MTF 

分 类 号：O439[机械工程—光学工程]