Real distributed vibration sensing with high frequency response based on pulse pair

Qian He; Tao Zhu; Xianghui Xiao; Dongmei Diao; Wei Huang; Xiaoyi Bao

doi:10.1117/12.2059252

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2 June 2014 Real distributed vibration sensing with high frequency response based on pulse pair

Qian He, Tao Zhu, Xianghui Xiao, Dongmei Diao, Wei Huang, Xiaoyi Bao

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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 915761 (2014) https://doi.org/10.1117/12.2059252
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

In conventional phase-sensitive optical time domain reflectometry (φ-OTDR), the length of sensing fiber mainly determines the repetition rate of probe light pulses, which limits the extent of detectable frequency range. Moreover, averaging method, which is adopted to enhance the location signal-to-noise-ratio (SNR), further decreases the maximum detectable frequency. This paper demonstrates a distributed vibration sensor with satisfied location SNR and extended frequency response range by using a probe pulse pair with a frequency difference. Experimental results show that this method is able to break the trade-off between the given sensing fiber length and the traditional maximum detectable frequency response of φ-OTDR system.

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Qian He, Tao Zhu, Xianghui Xiao, Dongmei Diao, Wei Huang, and Xiaoyi Bao "Real distributed vibration sensing with high frequency response based on pulse pair", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915761 (2 June 2014); https://doi.org/10.1117/12.2059252

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