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15 October 2013 Distributed vibration sensing based on time-difference pulses
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Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 89241M (2013)
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China
An optical fiber distributed sensing system merged Mach-Zehnder interferometer (MZI) and phase-sensitive optical time domain reflectometer (φ-OTDR) for vibration measurement with wide frequency response and spatial resolution is proposed and demonstrated. Two acoustic optical modulators (AOM) are adopted to generate narrow pulses and wide pulses respectively on both ends of sensing fiber with a time difference. Narrow pulses are used to generate Rayleigh backscattering light, which locates the vibration point, while wide pulses interfere with reference light as a MZI to obtain frequency response. To simulate the high frequency responses of crack in civil structures, the sudden break of pencils adjacent to fiber loop has been measured. The experimental results show 5 m spatial resolution and up to 6.3 MHz frequency response with 50 ns pulse width are achieved in 1150 m sensing distance.
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Qian He, Tao Zhu, Xianghui Xiao, and Xiaoyi Bao "Distributed vibration sensing based on time-difference pulses", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89241M (15 October 2013);

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