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School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430000, Hubei, China


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Academic Editor: Vittorio M. N. Passaro

Abstract This paper proposes a fiber Bragg grating sensing-based micro-vibration sensor. The optical fiber has been directly treated as an elastomer to design the micro-vibration sensor, which possesses two FBGs. The mass is fixed on the middle of the fiber, and the vertical vibration of the mass has been converted into the axial tension-compression of the fiber. The principle of the sensor has been introduced, and the experiment conclusions show that the sensor sensitivity is 2362 pm-g within the range of 200–1200 mm-s2, which is consistent with theoretical analysis sensitivity of 2532.6 pm-g, and it shows an excellent linearity of 1.376%, while the resonant frequency of the sensor is 34 Hz, and the flat frequency range resides in the 0–22 Hz range. When used to measure micro-vibrations, its measured frequency relative error is less than 1.69% compared with the values acquired with a MEMS accelerometer, and the amplitude values of its measured vibration signal are consistent with the MEMS accelerometer under different excitation conditions too, so it can effectively realize the micro-vibration measurements. View Full-Text

Keywords: micro-vibration; fiber Bragg grating; vibration sensor micro-vibration; fiber Bragg grating; vibration sensor

Autor: Tianliang Li * , Yuegang Tan and Zude Zhou

Fuente: http://mdpi.com/


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