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An optimization method for improving the accuracy of centroid computation based on Shack-Hartmann wavefront sensor
Xiaoyu Zhang [1,2,3], Caixia Wang[1,2]
2017
会议名称Proceedings of SPIE: AOPC 2017: Optical Sensing and Imaging Technology and Applications
会议录名称0277-786X
卷号10462
页码1046234
摘要The Shack-Hartmann wavefront sensor is widely used because of high light energy utilization and the simultaneous measurement of the optical wavefront phase distribution and intensity distribution. The accuracy of the centroid computation has a great influence on the detection accuracy of the Shack-Hartmann wavefront sensor. In this paper, a new method is proposed to improve the accuracy of centroid computation. This method include three steps. First of all, we use a new sliding template method to locate the spot automatically and obtain the approximate center of the spot. Next, we take an adaptive threshold method. After the processing of subtracting the threshold , we use the center of gravity(CoG) method to calculate the spot centroid. A series of simulations are conducted to verify the effectiveness and accuracy of this new method. Compared with the widely-used optimum threshold algorithm and the CoG method, the new algorithm not only enhances the accuracy of centroid computation but also has strong stability.
关键词adaptive optics(AO),Shack-Hartmann wavefront sensor, centroid computation, threshold, CoG
语种英语
EI分类号2017-2151
文献类型会议论文
条目标识符http://ir.ioe.ac.cn/handle/181551/9019
专题自适应光学技术研究室(八室)
作者单位1.Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu , Sichuan, China, 610209
2.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan, China, 610209
3.University of Chinese Academy of Sciences, Beijing, China , 100049
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GB/T 7714
Xiaoyu Zhang [1,2,3], Caixia Wang[1,2]. An optimization method for improving the accuracy of centroid computation based on Shack-Hartmann wavefront sensor[C],2017:1046234.
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