基于成像清晰度函数的非球面反射镜位置校正实验研究  

Experimental research of alignment error correction by aspheric mirror based on the function of imaging quality

作　　者：周龙峰[1,2,3] 张昂[1,2] 张俊波[1,2] 樊新龙[1,2] 魏凌[1,2] 陈善球[1,2] 鲜浩[1,2] 

机构地区：[1]中国科学院自适应光学重点实验室,成都610209 [2]中国科学院光电技术研究所,成都610209 [3]中国科学院大学,北京100049

出　　处：《物理学报》2016年第13期311-320,共10页Acta Physica Sinica

基　　金：中国科学院空间科学战略性先导科技专项(批准号:XDA04060902)资助的课题~~

摘　　要：在具有双曲面、抛物面或椭圆面反射镜的成像光学系统中,反射镜的位置误差通常具有对成像质量影响灵敏的特点.因此,在该类光学系统装调或工作过程中反射镜位置存在误差时需要对该反射镜进行精确调整.目前,反射镜位置校正的方法多基于对系统波前误差的测量,从而判断其位置误差.然而在系统工作过程中可能无法进行光学系统的波前测量,或者需要复杂的光学系统才能实现波前误差的测量.本文以焦平面图像清晰度作为评价函数,采用随机并行梯度下降算法对反射镜位置进行调整,使系统成像质量达到最佳.针对迭代过程中反射镜位置发生变化时图像偏离探测器靶面而无法探测的问题,本文采用了一种反射镜垂直光轴平移和旋转相结合的调整方法.在保证图像位置不变化的条件下对系统像差进行校正.室内实验验证了该方法具有可行性,校正后的成像质量达到衍射极限.Image definition will be influenced by alignment errors of mirrors in an optical system consisting of hyperbolic,parabolic or ellipse mirrors. The major factors of alignment errors are gravity, wind loads and heat exchange for some optical systems like ground-based telescopes, while vibration and temperature gradient for systems like space telescopes.Larger telescopes are more sensitive to these error sources, which becomes the concerns of researchers. So the alignment errors of mirrors must be corrected in time to keep systems working in best condition. In order to solve the problem,many methods are proposed based on the detection of wave-front errors using wave-front sensors like Hartmann-Shack.However, wave-front sensors may not be used or cause optical systems to be more complicated. For example, multi-fields must be tested when telescope is working. On the one hand, if a wave-front sensor is used, it must be moved around imaging plane, on the other hand, if more wave-front sensors are used, system must be more complicated. So a new method is discussed for alignment error correction by evaluating the quality of spot diagrams based on the using of stochastic parallel gradient descent（SPGD） algorithm. The method considers the performance metric like spot diagram radius as a function of control parameters and then uses the SPGD optimization algorithm to improve the performance metric. The control parameters include positions of mirrors. The iteration process must be used in the right way to control position parameters. If it is not considered, a problem may come up that positions of spot diagrams may be influenced by the iteration. Furthermore, spot diagrams will probably disappear from detectors. Then the radii of spot diagrams are not correct. So a better way is put forward by the combination of de-center and tilt of mirrors. The way ensures that the position error produced by de-center and tilt are compensated for. A formula is provided in this paper to give the relationship between them. Based on the ana

关 键 词：反射镜 位置误差 成像清晰度 迭代 

分 类 号：TH74[机械工程—光学工程]