Acta Photonica Sinica, Volume. 47, Issue 2, 212003(2018)
Cophasing Experiment of Active Optics for Segmented Mirror
In order to solve the prolem of cophasing detection for the segmented mirror of telescope, the piston errors measurement of segmented mirror by the broadband and narrowband ShackHartmann algorithm are theoretical analyzed and simulated, and an active optics and cophasing 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 ShackHartmann is used to detect the errors of cofocus ,and the active optics is used to control piezoelectric actuators to realize the fine cofocus of segmented mirror. Then the broadband phasing algorithm is used to realize the measurement of corse cophasing of segmented mirror. Finally, the narrowband phasing algorithm is used to realize the measurement of fine cophasing of segmented mirror, and the active optics is used to control piezoelectric actuators to realize of the segmented mirror cophasing adjustment. The experimental results show that the range is dozens of micros and the measurement accuracy is better than 15 nm of broadband and narrowband phasing algorithm, which demonstrates that the methods are suitable for the segmented mirror cophasing measurement and adjustment.
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LI Bin, WU Jian, LIU Yande, XIE Fengyun, CHEN Mo, XIAN Hao. Cophasing Experiment of Active Optics for Segmented Mirror[J]. Acta Photonica Sinica, 2018, 47(2): 212003
Received: Sep. 11, 2017
Accepted: --
Published Online: Jan. 30, 2018
The Author Email: Bin LI (libingioe@126.com)