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  • Received: Jun. 24, 2019

    Accepted: Aug. 6, 2019

    Posted: Dec. 5, 2019

    Published Online: Nov. 26, 2019

    The Author Email: Hao Xian (xianhao@ioe.ac.cn)

    DOI: 10.3788/COL201917.121101

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    Yongfeng Zhang, Hao Xian. Piston sensing via a dispersed fringe sensor with a merit-function-based active scanning algorithm at low light levels[J]. Chinese Optics Letters, 2019, 17(12): 121101

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Chinese Optics Letters, Vol. 17, Issue 12, 121101 (2019)

Piston sensing via a dispersed fringe sensor with a merit-function-based active scanning algorithm at low light levels

Yongfeng Zhang1,2,3, and Hao Xian1,2,*

Author Affiliations

  • 1Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
  • 2Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

Dispersed fringe sensors are a promising approach for sensing the large-scale physical step between adjacent segments with acceptable accuracy. However, the nature of dispersion in a dispersed fringe sensor leads to the ideal dispersed fringe pattern becoming vulnerable to noise, particularly at low light levels. A reliable merit-function-based algorithm with an active actuation is introduced here. The feasibility of our algorithm is numerically demonstrated, and Monte Carlo experiments for different signal-to-noise ratios are conducted to assess its robustness. The results show that the method is valid even when the signal-to-noise ratio is as low as 1.