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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
会议录名称Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
卷号8450
期号8450
页码Vol.8450 0B-1-6
会议日期2012-7-1
会议地点Amsterdam, Netherlands
会议主办者The International Society for Optical Engineering
出版者SPIE
摘要
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.
关键词Co-phasing Segmented Mirror Wavefront Sensing Optimization Algorithm
学科领域自适应光学
文献类型会议论文
条目标识符http://ir.niaot.ac.cn/handle/114a32/648
专题会议论文
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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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