Fiber-laser-based cantilever-type vector sensor for acoustic motion measurement

Xin Zhou; Zhou Meng; Jianfei Wang; Yan Liang; Mingyang Wang; Mo Chen

doi:10.1117/12.2575138

10 October 2020 Fiber-laser-based cantilever-type vector sensor for acoustic motion measurement

Xin Zhou, Zhou Meng, Jianfei Wang, Yan Liang, Mingyang Wang, Mo Chen

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115541K (2020) https://doi.org/10.1117/12.2575138
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

A kind of fiber optic particle velocity sensor based on planar cantilever beam is studied. The fiber laser is attached to the surface of a cantilever. The cantilever beam is deformed by the acoustic field in the vertical direction of the surface, and the frequency of the output of the fiber laser is modulated, so as to realize the acoustic vector sensor. In particular, in viscous fluids, the cantilever is driven by an additional force proportional to the velocity of fluid particle. By selecting the appropriate liquid, the fluid viscous force will become the main driving force of the cantilever beam, making the sensor respond directly to the velocity of water particle, thus having a flat sound pressure sensitivity response curve. According to the cantilever beam equation in fluid, the theoretical simulation of the frequency response of the sensor shows that the acoustic pressure sensitivity is 10⁴Hz/Pa and the acceleration sensitivity is 10⁸Hz/g from 10Hz to 60Hz. The acoustic pressure sensitivity and acceleration sensitivity of the sensor in air and water are studied by experiment, and the results are consistent with the theoretical simulation. Compared with the traditional fiber optic accelerometer, the sensor of this structure has the advantages of small size, simple structure and high sensitivity, which is of great significance for application of vector hydrophone in low frequencies and is beneficial to constitute large scale hydrophone array.

Conference Presentation

Citation Download Citation

Xin Zhou, Zhou Meng, Jianfei Wang, Yan Liang, Mingyang Wang, and Mo Chen "Fiber-laser-based cantilever-type vector sensor for acoustic motion measurement", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115541K (10 October 2020); https://doi.org/10.1117/12.2575138

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