Infrared and Laser Engineering, Volume. 49, Issue S2, 20200340(2020)
Research on a fiber grating low frequency vibration sensor with large range and high sensitivity
A fiber grating (FBG) vibration sensor based on a flexible hinge suitable for low-frequency vibration measurement was proposed, which realized high-precision measurement of low-frequency signals within a certain range in response to the needs of low-frequency vibration detection. According to the ideal structure model of the sensor, combined with the torque balance equation and the Lagrangian equation, the calculation method of the sensitivity and natural frequency of the sensor was given, and the structure of the sensor was analyzed by finite element using ANSYS software, and the first-order resonance frequency was obtained as 92.457 Hz. Through the performance test, the sensor has good flatness in the frequency range of 0.5 to 55 Hz, and the natural frequency is 91 Hz, which is consistent with the finite element analysis result. The sensitivity is 1.94 nm/g and the linearity is 99.99%. The longitudinal sensitivity is much better than the lateral sensitivity, and it has strong lateral anti-interference ability.
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Su Li1, Zhang Xiaotong2, Lv Peitong2, Sun Mingyang2, Wang Chenghu3, Chen Chen2, Zhang Tianyu2*. Research on a fiber grating low frequency vibration sensor with large range and high sensitivity[J]. Infrared and Laser Engineering, 2020, 49(S2): 20200340
Category: 光通信与光传感
Received: Sep. 13, 2020
Accepted: Oct. 15, 2020
Published Online: Feb. 5, 2021
The Author Email: Tianyu2* Zhang (zty@jlu.edu.cn)