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

QIN Yusheng; HAN Xin; LI Xiangxian; TONG Jingjing; LI Yan; and GAO Minguang

doi:doi:10.1007/s11801-023-2149-3

光电子快报（英文版）, 2023, 19 (3): 170, Published Online: Mar. 18, 2023

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

论文大纲

QIN Yusheng ^1,2HAN Xin ^1,*LI Xiangxian ¹TONG Jingjing ¹LI Yan ¹and GAO Minguang ¹

Author Affiliations

¹ Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

² University of Science and Technology of China, Hefei 230026, China

Abstract

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]. 光电子快报（英文版）, 2023, 19(3): 170.

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