Quantitative detection of multi-frequency disturbance signal by ϕ-OTDR system

Wang, Ya-Jun, Liu, Bin, Liu, Juan, Yuan, Jinhui, Fu, Yanjun, He, Xing-Dao and Wu, Qiang (2023) Quantitative detection of multi-frequency disturbance signal by ϕ-OTDR system. Measurement Science and Technology, 34 (3). 034002. ISSN 0957-0233

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Official URL: https://doi.org/10.1088/1361-6501/aca691


Recently, the combination of pattern recognition technology and distributed fiber sensing systems has become increasingly common, so whether the disturbance signal can be well recovered has become increasingly important. To verify the recovery and linear response of a distributed fiber optic sensing system to multi-frequency disturbance signals, a heterodyne coherent detection system for phase-sensitive optical time-domain reflectometry is developed. The output beat signal is extracted using the digital in-phase/quadrature demodulation algorithm. The signal can be precisely located on a 7 km length range, and the disturbance signal can be restored well through the phase information. Not only the superposition signal composed of the same signal but also that composed of different kinds of signals can be successfully restored. A fast Fourier transform algorithm is used to obtain the frequency information of the superimposed signal. Combined with the use of a finite impulse response filter, the superposed signal is decomposed according to its frequency components, which perfectly restores the two signals before they are superimposed. In addition, their amplitude is highly linear with the driving voltage of the piezoelectric transducer. The system can fully retain the details of each frequency component in the recovery of multi-frequency disturbance signals. More importantly, in field experiments, the disturbance behavior is well recovered, which has broad prospects in the application of perimeter security.

Item Type: Article
Additional Information: Funding information: This work was supported by the National Natural Science Foundation of China (NSFC) (11864025, 62175097, 62065013 and 62163029), the Natural Science Foundation of Jiangxi Province (20212BAB202024 and 20192ACB20031) and Royal Society International Exchanges 2021 Round 2 (IES\R2\212135).
Uncontrolled Keywords: φ-OTDR, multifrequency disturbance, quantitative detection, I/Q demodulation
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 12 Dec 2022 15:29
Last Modified: 12 Dec 2022 15:30
URI: https://nrl.northumbria.ac.uk/id/eprint/50864

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