Volume 17 Issue 6
Nov.  2024
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LIU Qiang, LI Wen-jing, MA Chao, WEI Shu-hui, FU Tian-shu, YU Bo, LIU Chao. Design of two-dimensional low-frequency fiber Bragg grating vibration sensor[J]. Chinese Optics, 2024, 17(6): 1450-1457. doi: 10.37188/CO.2024-0069
Citation: LIU Qiang, LI Wen-jing, MA Chao, WEI Shu-hui, FU Tian-shu, YU Bo, LIU Chao. Design of two-dimensional low-frequency fiber Bragg grating vibration sensor[J]. Chinese Optics, 2024, 17(6): 1450-1457. doi: 10.37188/CO.2024-0069

Design of two-dimensional low-frequency fiber Bragg grating vibration sensor

cstr: 32171.14.CO.2024-0069
Funds:  Supported by The Basic Research Support Project for the Excellent Youth Scholars of Heilongjiang Province (No. YQJH2023077)
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  • Corresponding author: msm-liu@126.com
  • Received Date: 12 Apr 2024
  • Rev Recd Date: 30 Apr 2024
  • Accepted Date: 25 Jun 2024
  • Available Online: 21 Aug 2024
  • In order to acquire and monitor the low-frequency vibration signal, a two-dimensional vibration sensor with a symmetrical circular flexure hinge is designed, which can work in the x and z axes. The mechanical characteristics of the sensing structure are analyzed theoretically. The model is established in Comsol for simulation analysis, and the structure is optimized by finite element method. The hinge resonant frequency is designed to be 420 Hz. The fiber Bragg grating is pasted on the surface of the hinge structure as a strain detection device, and the dynamic demodulation of FBG is realized by the edge filter method. The performance of the sensor is tested with a standard shaking table. The experimental results show that the natural frequencies of the sensor in the x and z axes both are 420 Hz, the operating frequency range is 20−300 Hz, the average sensitivity in the flat region is 1847.32 mV/g, and the acceleration resolution is 5.41×10−4 g. The sensor demonstrates a less than 5% lateral interference level in all two-dimensional orientations. The sensor designed in this paper is a two-dimensional vibration sensor, which is suitable for highly sensitive detection of low-frequency vibration signals.

     

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