Dr. Chongxin Shan Profile

Dr. Chongxin Shan

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Proceedings Article | 27 November 2023 Poster + Paper

Highly sensitive fiber-optic acoustic sensor utilizing a hollow cantilever

Shen Tian, Yingying Qiao, Mu Liang, Mingyang Feng, Yang Gao, Lei Li, Chongxin Shan

Proceedings Volume 12771, 1277118 (2023) https://doi.org/10.1117/12.2686475

KEYWORDS: Acoustics, Fiber optics sensors, Sensors, Fabry–Perot interferometry

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Sensitivity optimization in acoustic sensors necessitates the development of acoustic-sensitive elements. Among various designs, the cantilever structure has emerged as a highly sensitive choice. In this study, we introduce a novel Fabry-Perot (F-P) interferometric fiber-optic acoustic sensor (FOAS) that integrates a hollow cantilever structure. The proposed structure enhances vibration flexibility by reducing both the effective mass and spring constant of the cantilever. Experimental results demonstrate that the proposed structure outperforms the original design in terms of sensitivity. Notably, at 1.7 kHz, the sensitivity and minimum detectable acoustic pressure level (MDP) reach 91.4 mV/Pa and 6.2 µPa/√ Hz, respectively. The proposed hollow cantilever establishes an optimization framework for highly sensitive acoustic sensors.

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