A simple method of measuring vibration frequency based on φ-OTDR

Zesen Zhang; Jieqia Chen; Zhenhua Xu; Zujun Qin

doi:10.1117/12.2672638

10 April 2023 A simple method of measuring vibration frequency based on φ-OTDR

Zesen Zhang, Jieqia Chen, Zhenhua Xu, Zujun Qin

Proceedings Volume 12614, 14th International Photonics and Optoelectronics Meetings (POEM 2022); 126140K (2023) https://doi.org/10.1117/12.2672638
Event: 14th International Photonics and Optoelectronics Meeting (POEM 2022), 2022, Wuhan, China

Abstract

Distributed vibration sensors by amplitude-demodulated phase sensitive optical time-domain reflectometers (φ-OTDR) have been widely used in many applications like safety monitoring of large-scale infrastructures and fence security. In order to locate vibrations, every two Rayleigh backscattering traces (RBTs) spaced apart by a certain interval (i.e., differential step k) are traditionally subtracted over a certain measurement time, and then all the subtractions are summed together and used to detect external vibration events. This method is denoted as amplitude-based accumulative differential method (ADM). Yet, the ADM has been demonstrated that the superimposing differential signal shows highly dependent on k which is closely related to vibration frequency (i.e., fs). Inappropriate k values would fail to locate the vibration. It is thus possible to envisage measuring f_s by taking advantage of this strong dependence of the ADM on f_s. In this manuscript, a simple method of estimating f_s is proposed by measuring the relationship between the ADM signal and k. The validity of this method is demonstrated by our experiment, in which a vibration event induced by a sinusoidal-driven PZT is detected.

Citation Download Citation

Zesen Zhang, Jieqia Chen, Zhenhua Xu, and Zujun Qin "A simple method of measuring vibration frequency based on φ-OTDR", Proc. SPIE 12614, 14th International Photonics and Optoelectronics Meetings (POEM 2022), 126140K (10 April 2023); https://doi.org/10.1117/12.2672638

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