Vibration monitoring with high frequency response based on coherent phase-sensitive OTDR method

Yuelan Lu; Tao Zhu; Xiaoyi Bao; Liang Chen

doi:10.1117/12.885121

17 May 2011 Vibration monitoring with high frequency response based on coherent phase-sensitive OTDR method

Yuelan Lu, Tao Zhu, Xiaoyi Bao, Liang Chen

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77533K (2011) https://doi.org/10.1117/12.885121
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

A coherent phase-sensitive OTDR system to detect distributed weak vibration is reported via heterodyne detection combined with moving averaging and moving differential signal processing. The location and high frequency response of weak vibration signal, such as pencil-break vibration which would match the characteristics of crack as a source of an acoustic emission signals, are easily monitored. Our experimental results show that spatial resolution of vibration is about 5m with 50 ns pump pulses, and the signal to noise ratio could be up to 6.5 dB. Also the frequency response could be up to 1 KHz. Both consecutive multiple events at the same location and multiple simultaneous events at different location with frequency components are identified which means our vibration testing system could be used for distributed multiple vibration events detection.

Citation Download Citation

Yuelan Lu, Tao Zhu, Xiaoyi Bao, and Liang Chen "Vibration monitoring with high frequency response based on coherent phase-sensitive OTDR method", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77533K (17 May 2011); https://doi.org/10.1117/12.885121

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