Chinese Optics Letters, 2019, 17 (1): 010601, Published Online: Jan. 17, 2019  

High-sensitivity FBG microphone with static pressure equalization and optimized response Download: 744次

Author Affiliations
1 Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
2 School of Electrical Engineering and Telecommunications, The University of New South Wales, NSW 2052, Australia
3 College 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
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.

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

引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!