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