Abstract

We present a high-sensitivity fiber Bragg grating (FBG)-based microphone with a flat response and static pressure equalization. A very high dynamic sensitivity of the microphone is achieved by a pressure sensing structure based on a carbon fiber diaphragm. Static pressure equalization is realized by a balance structure with a capillary glass tube. The resonances of the sensor are suppressed by air damping structures, and a broadened flat response is achieved. An acoustic-solid interaction model was used to analyze the response characteristics of the microphone. An experimental prototype was produced and tested, and the results are well consistent with the design. The tested sensitivity was ?10 dB re 1 pm/Pa from 10 Hz to 2.5 kHz with a fluctuation of less than ±1.5 dB. Combined with the phase-generated-carrier-based coherent detection scheme, the microphone can achieve a sound resolution of the milli-pascal level. The static pressure sensitivity is measured to be ?0.27 pm/atm, which is 100 dB lower than the dynamic sensitivity.

补充资料

DOI：10.3788/col201917.010601

所属栏目：Fiber optics and optical communication

基金项目：This work was supported by the National Natural Science Foundation of China (No. 61605102), the Shandong Youth Taishan Scholar Program, and the Key Research and Development Program of Shandong Province (Nos. 2018GGX101042 and 2018GSF120008).

收稿日期：2018-08-15

录用日期：2018-11-12

网络出版日期：2018-12-25

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联系人作者：Chang Wang(wang960100@163.com)

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引用该论文

Faxiang Zhang, Chang Wang, Xiaolei Zhang, Shaodong Jiang, Jiasheng Ni, Gangding Peng, "High-sensitivity FBG microphone with static pressure equalization and optimized response," Chinese Optics Letters 17(1), 010601 (2019)