Distributed optical fiber acoustic sensing method based on dual-chirped pulses and cross-correlation analysis

Guanhua Liang; Junfeng Jiang; Kun Liu; Shuang Wang; Wenjie Chen; Zhe Ma; Zhenyang Ding; Xuezhi Zhang; Yongning Zhang; Xiaoying Liu; Gaofei Gu; Tiegen Liu

doi:10.1117/12.2543533

12 March 2020 Distributed optical fiber acoustic sensing method based on dual-chirped pulses and cross-correlation analysis

Guanhua Liang, Junfeng Jiang, Kun Liu, Shuang Wang, Wenjie Chen, Zhe Ma, Zhenyang Ding, Xuezhi Zhang, Yongning Zhang, Xiaoying Liu, Gaofei Gu, Tiegen Liu

Author Affiliations +

Proceedings Volume 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 114360D (2020) https://doi.org/10.1117/12.2543533
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

A fiber-optic distributed acoustic sensing method based on phase-sensitive optical time domain reflectometry combined with dual-chirped pulse and micro-reflective fiber Bragg grating (FBG) is proposed. The sensing fiber consists of a micro-reflective FBG with uniform spatial interval. The micro-reflective FBG help to gain a high signalto-noise ratio light signal, comparing with the Rayleigh backscattering (RBS) light of optical fiber itself. The dualchirped pulses are generated by a time delay, whose corresponding spatial interval approximately equal to twice the spatial interval of adjacent micro-reflective FBG. A beating signal is generated due to the interference of the two identical chirped pulses reflected by the micro-reflective FBG array. Acoustic disturbance between the microreflective fiber gratings will change the phase of the beating signal and the interference waveform will shift. Quantitative measurement can be achieved by directly demodulating the beating signal through using a crosscorrelation algorithm. By using such a method to perform the sensing for the micro-reflective FBG array, distributed quantitative measurement can be realized with only direct detection scheme and simple demodulation algorithm. Experiment are carried out with 2km fiber and PZT vibration simulation and the results verified the effectiveness of our method.

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Guanhua Liang, Junfeng Jiang, Kun Liu, Shuang Wang, Wenjie Chen, Zhe Ma, Zhenyang Ding, Xuezhi Zhang, Yongning Zhang, Xiaoying Liu, Gaofei Gu, and Tiegen Liu "Distributed optical fiber acoustic sensing method based on dual-chirped pulses and cross-correlation analysis", Proc. SPIE 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 114360D (12 March 2020); https://doi.org/10.1117/12.2543533

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KEYWORDS

Fiber Bragg gratings

Demodulation

Acoustics

Optical fibers

Sensing systems

Spatial resolution

Optical sensing

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