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Co-phasing of the segmented mirror based on the generalized phase diversity wavefront sensor
Changwei Li; Sijiong Zhang
2012-09-13
Source PublicationModern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Volume8450
Issue8450
PagesVol.8450 0B-1-6
Conference Date2012-7-1
Conference PlaceAmsterdam, Netherlands
Funding OrganizationThe International Society for Optical Engineering
PublisherSPIE
Abstract
The stochastic parallel gradient descent algorithm based on the generalized phase diversity wavefront sensor is presented for co-phasing of segmented mirrors. Cost functions of the optimization algorithm were built up in different circular zones for intensity images of the sensor. In order to achieve high accuracy for co-phasing, four phase diversity functions with increasing amplitudes were applied to the sensor for improving the strength of output signal from the wavefront sensor during the aberrations of the segmented mirror decreasing with the co-phasing process. A simulated segmented mirror was used to test the feasibility of this method. The numerical experiments show that the co-phasing accuracy is very high for the aberrations of the segmented mirrors less than 1.5 wavelengths. And the algorithm is very robust and noise tolerant.
KeywordCo-phasing Segmented Mirror Wavefront Sensing Optimization Algorithm
Subject Area自适应光学
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/648
Collection中国科学院南京天文光学技术研究所_会议论文
中科院天文光学技术重点实验室_会议论文
Recommended Citation
GB/T 7714
Changwei Li,Sijiong Zhang. Co-phasing of the segmented mirror based on the generalized phase diversity wavefront sensor[C]:SPIE,2012:Vol.8450 0B-1-6.
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