A method of frequency drift fitting correction for distributed optical fiber acoustic sensing technology

Zijian Peng; Yanmin Zhang; Zhengying Li

doi:10.1117/12.2689116

31 July 2023 A method of frequency drift fitting correction for distributed optical fiber acoustic sensing technology

Zijian Peng, Yanmin Zhang, Zhengying Li

Proceedings Volume 12747, Third International Conference on Optics and Image Processing (ICOIP 2023); 127470L (2023) https://doi.org/10.1117/12.2689116
Event: Third International Conference on Optics and Image Processing (ICOIP 2023), 2023, Hangzhou, China

Abstract

Distributed Acoustic Sensing (DAS), which utilizes phase change sensing, has higher signal-to-noise ratio and sensitivity compared to other optical fiber sensing technologies, and is often used in the field of marine acoustic detection and seismic wave measurement. However, the frequency fluctuation of the output light of the narrow linewidth laser used in the DAS system and the parasitic interference phenomenon in the sensing fiber can generate low-frequency noise, which ultimately leads to very low frequency drift noise in the demodulated signal. Aiming at the problem of frequency drift in long-distance transmission with parasitic interference as the main source, time-varying filtering empirical mode decomposition is used to extract frequency drift for fiber length segmentation, and combined with improved de trend fluctuation analysis to evaluate the intrinsic mode function, correct and fit to solve the frequency drift in long-distance transmission.

Citation Download Citation

Zijian Peng, Yanmin Zhang, and Zhengying Li "A method of frequency drift fitting correction for distributed optical fiber acoustic sensing technology", Proc. SPIE 12747, Third International Conference on Optics and Image Processing (ICOIP 2023), 127470L (31 July 2023); https://doi.org/10.1117/12.2689116

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