Optimization of a fiber optic flexible disk microphone

Gang Zhang; Benli Yu; Hui Wang; Fei Liu; Xuqiang Wu

doi:10.1117/12.904823

22 November 2011 Optimization of a fiber optic flexible disk microphone

Gang Zhang, Benli Yu, Hui Wang, Fei Liu, Xuqiang Wu

Proceedings Volume 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 81990J (2011) https://doi.org/10.1117/12.904823
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

An optimized design of a fiber optic flexible disk microphone is presented and verified experimentally. The phase sensitivity of optical fiber microphone (both the ideal model with a simply supported disk (SSD) and the model with a clamped disk (CLD)) is analyzed by utilizing theory of plates and shells. The results show that the microphones have an optimum length of the sensing arm when inner radius of the fiber coils, radius and Poisson's radio of the flexible disk have been determined. Under a typical condition depicted in this paper, an optimum phase sensitivity for SSD model of 27.72 rad/Pa (-91.14 dB re 1 rad/μPa) and an optimum phase sensitivity for CLD model of 3.18 rad/Pa (-109.95 dB re 1 rad/μPa), can be achieved in theory. Several sample microphones are fabricated and tested. The experimental results are basically consistent with the theoretical analysis.

Citation Download Citation

Gang Zhang, Benli Yu, Hui Wang, Fei Liu, and Xuqiang Wu "Optimization of a fiber optic flexible disk microphone", Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 81990J (22 November 2011); https://doi.org/10.1117/12.904823

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