Analysis of correlation algorithms for Shack-Hartmann wavefront sensors

doi:10.1117/12.2507015

CORC > 光电技术研究所 > 中国科学院光电技术研究所 > 自适应光学技术研究室（八室）

	Analysis of correlation algorithms for Shack-Hartmann wavefront sensors
	Xiong, Zhaojun 1,2,3; Chen, Shanqiu 1,3; Dong, Lizhi 1,3; Yang, Ping 1,3; Xu, Bing 1,3; Zhao, Wang 1,2,3; Yu, Xin 1,2,3; Yang, Kangjian 1,2,3; Wang, Xun 1,2,3; He, Xing 1,3
	2019
会议日期	June 26, 2018 - June 29, 2018
会议地点	Chengdu, China
卷号	10837
DOI	10.1117/12.2507015
页码	108370P
英文摘要	Shack-Hartmann wavefront sensors calculate the position of focal spot in each sub-aperture from intensity distributions, the noises of the detector itself would have a certain impact on the detecting accuracy and would lead to inaccurate wavefront detections using conventional centroiding method. It has been demonstrated that the correlation algorithms with template matching is able to improve the accuracy. In this paper, several correlation algorithms such as absolute difference function, absolute difference function-squared, square difference function, cross-correlation function and normalized cross-correlation are compared at different signal-to-noise ratios. To further improve the accuracy, interpolation algorithms including equiangular line fitting, parabola interpolation, gauss interpolation and least square method are brought in, which turns out that least square method could minimize the detecting error. Besides, simulations within single aperture and full aperture both illustrate that cross-correlation function is most robust but needs more calculations, so is least square method. Moreover, although absolute difference function would be inaccurate at low signal-to-noise ratios, it still can obtain high detecting accuracy at high signal-to-noise ratios and it minimizes the calculations. © 2019 SPIE.
会议录	Proceedings of SPIE 10837 - 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
会议录出版者	SPIE
文献子类	会议论文
语种	英语
ISSN号	0277-786X
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/9602]
专题	光电技术研究所_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; 610209, China; 2.University of Chinese Academy of Sciences, Beijing; 100049, China 3.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China;
推荐引用方式 GB/T 7714	Xiong, Zhaojun,Chen, Shanqiu,Dong, Lizhi,et al. Analysis of correlation algorithms for Shack-Hartmann wavefront sensors[C]. 见:. Chengdu, China. June 26, 2018 - June 29, 2018.