Optoelectronics Letters, Volume. 19, Issue 3, 170(2023)

Research on determining the position of zero optical path difference with the wavelet transform

Yusheng QIN1,2, Xin HAN1、*, Xiangxian LI1, Jingjing TONG1, Yan LI1, and Minguang and GAO1
Author Affiliations
  • 1Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
  • 2University of Science and Technology of China, Hefei 230026, China
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    Due to the error of digital sampling, there is a deviation between the zero optical path difference (ZOPD) detection position of the interference signal in the infrared gas analyzer and the actual position. To solve this problem, a high-precision detection method of the ZOPD position based on wavelet transform is proposed. Firstly, the wavelet envelope curve of the interference signal is obtained by the wavelet transform, which can obtain the phase information and amplitude information of the maximum modulation position, and then the optimal ZOPD position is calculated by using the amplitude and phase information. The experimental results show that the error of the wavelet transform method is 19.617 nm, and the relative error is reduced by 93.11% compared with the peak method.


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    QIN Yusheng, HAN Xin, LI Xiangxian, TONG Jingjing, LI Yan, and GAO Minguang. Research on determining the position of zero optical path difference with the wavelet transform[J]. Optoelectronics Letters, 2023, 19(3): 170

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    Paper Information

    Received: Sep. 1, 2022

    Accepted: Oct. 31, 2022

    Published Online: Mar. 18, 2023

    The Author Email: Xin HAN (xhan@aiofm.ac.cn)