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High-sensitivity FBG microphone with static pressure equalization and optimized response
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.
所属栏目：Fiber optics and optical communications
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：2019-01-15
作者单位 点击查看
Chang Wang：Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Xiaolei Zhang：Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Shaodong Jiang：Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Jiasheng Ni：Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, ChinaCollege of Precision Instrument and Opto-Electronics Engineering and Key Laboratory of Opto-Electronics Information and Technical Science, Ministry of Education, Tianjin University, Tianjin 300072, China
Gangding Peng：Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, ChinaSchool of Electrical Engineering and Telecommunications, The University of New South Wales, NSW 2052, Australia
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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)
