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Sensors 2016, 16(4), 547;

A Fiber Bragg Grating Sensing-Based Micro-Vibration Sensor and Its Application

School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430000, Hubei, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 14 February 2016 / Revised: 6 April 2016 / Accepted: 12 April 2016 / Published: 15 April 2016
(This article belongs to the Section Physical Sensors)
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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

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Li, T.; Tan, Y.; Zhou, Z. A Fiber Bragg Grating Sensing-Based Micro-Vibration Sensor and Its Application. Sensors 2016, 16, 547.

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