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Distributed optical fiber vibration sensing using phase-generated carrier demodulation algorithm

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Abstract

A novel optical fiber-distributed vibration-sensing system is proposed, which is based on self-interference of Rayleigh backscattering with phase-generated carrier (PGC) demodulation algorithm. Pulsed lights are sent into the sensing fiber and the Rayleigh backscattering light from a certain position along the sensing fiber would interfere through an unbalanced Michelson interferometry to generate the interference light. An improved PGC demodulation algorithm is carried out to recover the phase information of the interference signal, which carries the sensing information. Three vibration events were applied simultaneously to different positions over 2000 m sensing fiber and demodulated correctly. The spatial resolution is 10 m, and the noise level of the Φ-OTDR system we proposed is about 10−3 rad/\(\surd {\text{Hz}}\), and the signal-to-noise ratio is about 30.34 dB.

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Acknowledgements

The authors would like to acknowledge the support of National Natural Science Foundation of China (NSFC) under Grant 61205089 and 61604135, Projects of Wuhan Science and Technology Program under Grant 2017010201010130.

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Authors and Affiliations

  1. School of Automation, China University of Geosciences, Wuhan, Hubei, China

    Zhihua Yu, Qi Zhang, Mingyu Zhang, Haolong Dai, Jingjing Zhang, Li Liu, Lijun Zhang, Xing Jin, Gaifang Wang & Guang Qi

  2. Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex Systems, Wuhan, Hubei, China

    Zhihua Yu, Qi Zhang, Mingyu Zhang, Haolong Dai, Jingjing Zhang, Li Liu, Lijun Zhang, Xing Jin, Gaifang Wang & Guang Qi

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  1. Zhihua Yu
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  2. Qi Zhang
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  3. Mingyu Zhang
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  4. Haolong Dai
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  5. Jingjing Zhang
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  6. Li Liu
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  7. Lijun Zhang
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  8. Xing Jin
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  9. Gaifang Wang
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  10. Guang Qi
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Correspondence to Zhihua Yu.

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Yu, Z., Zhang, Q., Zhang, M. et al. Distributed optical fiber vibration sensing using phase-generated carrier demodulation algorithm. Appl. Phys. B 124, 84 (2018). https://doi.org/10.1007/s00340-018-6956-3

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  • DOI: https://doi.org/10.1007/s00340-018-6956-3

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