Chinese Journal of Lasers, Volume. 47, Issue 5, 0506001(2020)
High-Frequency Vibration Detection of Phase-Sensitive Optical Time-Domain Reflectometer
The phase-sensitive optical time-domain reflectometer (φ-OTDR) can effectively detect the vibration information of fiber; however, the detectable vibration frequency range is generally between several hundred hertz and several kilohertz, limited by the length of the sensing fiber. To improve the vibration detection range, a φ-OTDR system that uses heterodyne coherent detection is built in this study. The phase information of the scattered optical signal of the sensing fiber is obtained using the I/Q demodulation method. Differential phase demodulation in the space and time domains is consecutively performed to achieve a distributed detection of high frequency vibration signals in the fiber. Furthermore, the feasibility of the proposed high-frequency vibration detection scheme is theoretically analyzed, and the vibration signal with a frequency of 500 kHz is effectively demodulated in the experiment, obtaining a sensing distance of 23 km.
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Muping Song, Shouwang Zhuang, Yixuan Wang. High-Frequency Vibration Detection of Phase-Sensitive Optical Time-Domain Reflectometer[J]. Chinese Journal of Lasers, 2020, 47(5): 0506001
Category: fiber optics and optical communications
Received: Oct. 22, 2019
Accepted: Jan. 10, 2020
Published Online: May. 12, 2020
The Author Email: Song Muping (songmp@zju.edu.cn), Zhuang Shouwang (z_shouwang@zju.edu.cn)