Abstract This paper is devoted to the study of an acoustic sensor system based on linear fiber optic Sagnac interferometer. An improved threshold denoising algorithm combined with the wavelet theory is proposed. Furthermore, a hybrid scheme based on the improved algorithm with bandpass filter is explored, and experimental verification of theoretical investigation is accomplished as well. Taking the measured speech signals as examples, the Allan variance of the signals can be reduced, while the class spacing criterion can be increased. It is of great significance for promoting the application of the fiber optic acoustic sensor system.

中文翻译：

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基于线性光纤Sagnac干涉仪的声传感器改进去噪算法

摘要 本文致力于研究一种基于线性光纤萨格纳克干涉仪的声学传感器系统。提出了一种结合小波理论的改进阈值去噪算法。此外，探索了一种基于带通滤波器改进算法的混合方案，并完成了理论研究的实验验证。以实测语音信号为例，可以减小信号的Allan方差，同时增加类间距准则。对推动光纤声学传感系统的应用具有重要意义。