Abstract
In this paper, we propose a distributed optical fiber vibration sensing system based on Φ-OTDR and Michelson interferometer. It can detect multiple vibrations simultaneously along a sensing fiber, and the vibration waveform, frequency, position and amplitude could be demodulated correctly using our proposed PGC demodulation algorithm. The experimental results show, a SNR of 34.86 dB is achieved with the background noise level of − 37 dB at the 1000 m, and the SNR is 28.09 dB with the background noise level of − 32 dB at the 6000 m.
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Acknowledgements
This research was funded by Projects of Wuhan Science and Technology Program under Grant 2017010201010130, partly by Projects of National Natural Science Foundation of China (NSFC) under Grants 61205089 and 61604135.
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Yu, Z., Dahir, A.K.A., Dai, H. et al. Distributed optical fiber vibration sensors based on unbalanced Michelson interferometer and PGC demodulation. J Opt 50, 1–6 (2021). https://doi.org/10.1007/s12596-020-00622-6
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DOI: https://doi.org/10.1007/s12596-020-00622-6