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Analysis of correlation algorithms for Shack-Hartmann wavefront sensors
Xiong, Zhaojun1,2,3; Chen, Shanqiu1,2; Dong, Lizhi1,2; Yang, Ping1,2; Xu, Bing1,2; Zhao, Wang1,2,3; Yu, Xin1,2,3; Yang, Kangjian1,2,3; Wang, Xun1,2,3; He, Xing1,2
Source PublicationProceedings of SPIE 10837 - 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Volume10837
Pages108370P
2019
Language英语
ISSN0277-786X
DOI10.1117/12.2507015
Indexed ByEi
EI Accession Number20190506432465
Subtype会议论文
AbstractShack-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.
EI KeywordsChemical detection - Functions - Interpolation - Manufacture - Mirrors - Optical testing - Signal to noise ratio - Telescopes - Template matching - Wavefronts
Conference Name9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, AOMATT 2018
Conference DateJune 26, 2018 - June 29, 2018
Conference PlaceChengdu, China
EI Classification Number537.1 Heat Treatment Processes - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 741.3 Optical Devices and Systems - 801 Chemistry - 921 Mathematics - 921.6 Numerical Methods
PublisherSPIE
Citation statistics
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/9138
Collection自适应光学技术研究室(八室)
Affiliation1.Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu; 610209, China;
2.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China;
3.University of Chinese Academy of Sciences, Beijing; 100049, China
Recommended Citation
GB/T 7714
Xiong, Zhaojun,Chen, Shanqiu,Dong, Lizhi,et al. Analysis of correlation algorithms for Shack-Hartmann wavefront sensors[C]:SPIE,2019:108370P.
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