摘要
针对拼接型天文望远镜主镜的共相检测问题,对宽窄带夏克哈特曼检测法在拼接主镜各子镜间平移误差的测量进行了理论与仿真分析,并搭建了一套室内拼接镜的主动共相检测实验光路系统,其中拼接镜是由4块对边长为100mm、曲率半径为2 000mm的正六边形球面反射镜组成.首先,利用夏克波前探测器进行了拼接镜的精共焦误差的检测,通过主动光学技术控制压电陶瓷促动器,实现了拼接镜的精共焦的调节;然后通过宽带共相检测实现了粗共相的检测;最后,通过窄带共相检测实现了精共相的检测,并通过主动光学技术控制压电陶瓷促动器,实现了共相的调节.实验表明:宽窄带夏克哈特曼检测法对拼接子镜平移误差测量量程达到几十微米,共相检测精度达到15nm,满足拼接镜对平移误差的测量要求.
In order to solve the prolem of co-phasing detection for the segmented mirror of telescope, the piston errors measurement of segmented mirror by the broadband and narrow-band Shack-Hartmann algorithm are theoretical analyzed and simulated, and an active optics and co-phasing experiment system is built. The segmented mirror is consisted of four hexagonal segments with the flat to flat lengths of 100 mm and the curvature of radius is 2 000 mm. Firstly, the Shack-Hartmann is used to detect the errors of co-focus ,and the active optics is used to control piezoelectric actuators to realize the fine co focus of segmented mirror. Then the broadband phasing algorithm is used to realize the measurement of corse co- phasing of segmented mirror, Finally, the narrow-band phasing algorithm is used to realize the measurement of fine co-phasing of segmented mirror, and the active optics is used to control piezoelectric actuators to realize of the segmented mirror co-phasing adjustment. The experimental results show that the range is dozens of micros and the measurement accuracy is better than 15 nm of broadband and narrow-band phasing algorithm, which demonstrates that the methods are suitable for the segmented mirror co-phasing measurement and adjustment.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2018年第2期130-140,共11页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.51565015
51705153)资助~~
关键词
天文光学
望远镜
子孔衍射
拼接镜
共相
主动光学
Astronomical optics
Telescope
Sub-aperture diffraction
Segmented mirror
Co-phasing
Active or adaptive optics
