Abstract
The detection of multiple acoustic disturbances by optical fiber is a hot research topic in the field of optical fiber sensing. This paper considers adopting an optical distributed acoustic sensing (DAS) system to detect multiple acoustic disturbances, proposes a new approach to processing the DAS signal based on time-space average in frequency domain, and overcomes the randomness of DAS time domain signal. Finally, it obtains a functional model of single-frequency (50–1 000 Hz) sound pressure level and DAS signal intensity, and also the cut-off frequency of acoustic disturbance is detected by DAS system.
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Foundation item: the Graduate Program Foundation of Shanghai Polytechnic University (No. EGD18YJ0045)
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Zhang, Y., Xu, H., Zhu, X. et al. Detection and Quantization Technique of Optical Distributed Acoustic Coupling Based on φ-OTDR. J. Shanghai Jiaotong Univ. (Sci.) 25, 208–213 (2020). https://doi.org/10.1007/s12204-020-2161-8
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DOI: https://doi.org/10.1007/s12204-020-2161-8