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Open AccessArticle

Performance Improvement of Dual-Pulse Heterodyne Distributed Acoustic Sensor for Sound Detection

by Xiangge He 1,2, Min Zhang 2,3, Lijuan Gu 1,2,*, Shangran Xie 4, Fei Liu 2 and Hailong Lu 1,2
1
College of Engineering, Peking University, Beijing 100871, China
2
Beijing International Center for Gas Hydrate, Peking University, Beijing 100871, China
3
Institute of Ocean Research, Peking University, Beijing 100871, China
4
Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(4), 999; https://doi.org/10.3390/s20040999
Received: 28 December 2019 / Revised: 8 February 2020 / Accepted: 9 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue Optical Fibers for Distributed Sensors)
Phase fading is fatal to the performance of distributed acoustic sensors (DASs) influencing its capability of distributed measurement as well as its noise level. Here, we report the experimental observation of a strong negative correlation between the relative power spectrum density (PSD) at the heterodyne frequency and the noise floor of the detected phase for the heterodyne demodulated distributed acoustic sensor (HD-DAS) system. We further propose a weighted-channel stack algorithm (WCSA) to alleviate the phase fading noise via an enhancement of the relative PSD at the heterodyne frequency. Experimental results show that the phase noise of the demodulated signal can be suppressed by 13.7 dB under optimal condition. As a potential application, we exploited the improved HD-DAS system to retrieve a piece of music lasted for 205 s, demonstrating the reliability of detecting wideband sound signal without distortion. View Full-Text
Keywords: distributed acoustic sensor; Rayleigh backscattering; phase fading; sound detection distributed acoustic sensor; Rayleigh backscattering; phase fading; sound detection
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He, X.; Zhang, M.; Gu, L.; Xie, S.; Liu, F.; Lu, H. Performance Improvement of Dual-Pulse Heterodyne Distributed Acoustic Sensor for Sound Detection. Sensors 2020, 20, 999.

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