A vibration monitoring system based on Sagnac interferometer with a novel algorithm

Jingjing Guo; Yang Han; Xin Feng; Changsen Sun

doi:10.1117/12.2572123

10 October 2020 A vibration monitoring system based on Sagnac interferometer with a novel algorithm

Jingjing Guo, Yang Han, Xin Feng, Changsen Sun

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115540Y (2020) https://doi.org/10.1117/12.2572123
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

An economical and reliable fiber-optic vibration sensing system is proposed in this paper, which can eventually cooperate with distributed fiber sensing systems for long-span structural inspection. The system is designed to monitor the vibration state of the position to be measured, based on the principle of a Sagnac fiber-optic sensor. A novel algorithm of analyzing the strength ratio between a certain frequency band and the background frequency band of the signal is employed in this sensing system. Two sets of experiments were implemented to validate the reliability of the algorithm. In the first experiment, we tested whether the algorithm can recognize the sensing fiber was trampled. Application of the sensing system on a cast-iron pipeline detection was performed in the second experiment. Experimental results showed that the forced vibration frequency of the pipeline is between 170~230 Hz, and the sensing system is reliable for rapid recognizing the vibration state of the sensing fiber, which indicated that this system has a potential in application of field measuring as a part of traditional distributed optical fiber sensing system.

Conference Presentation

Citation Download Citation

Jingjing Guo, Yang Han, Xin Feng, and Changsen Sun "A vibration monitoring system based on Sagnac interferometer with a novel algorithm", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115540Y (10 October 2020); https://doi.org/10.1117/12.2572123

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