Xian University of Petlum

Fengcheng, China

Xian University of Petlum

Fengcheng, China

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Wang H.-L.,Xian University of Petlum | Chen J.-M.,Xian University of Petlum | Fan W.,Xian University of Petlum | Zhao X.,Xian University of Petlum | And 2 more authors.
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2012

A drum-type skeleton base structure of fiber Bragg grating (FBG) vibration sensor is designed, where the FBG is mounted on double cylindrical rings, and the structure consists of a number of flexible sheets. The FBG vibration sensor demodulation system uses phase modulation for demodulating. The experimental results shows that the resonant frequency of the developed FBG vibration sensor is 440 Hz, and the acceleration sensitivity is about 76.4 pm/g. The sensor adopts the double cylinder elastic rings for transverse vibration restraint and then its amplitude-frequency characteristics in the 20-300 Hz frequency range show a flat horizontal line, and the phase-frequency characteristics also show a flat horizontal line at phase angle of φ=0. The proposed sensor is suitable for the low-frequency (20-300 Hz) vibration signal detection.


Wang H.-L.,Xian University of Petlum | Zhou H.-Q.,Xian University of Petlum | Gao H.,Xian University of Petlum | Feng D.-Q.,Xian University of Petlum | Fan W.,Xian University of Petlum
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2013

A fiber Bragg grating (FBG) acceleration vibration sensor based on the double uniform strength cantilever beams is developed. First, the simulation is conducted by ANSYS software. We can obtain the sensor amplitude-frequency and phase-frequency characteristics in each damping ratio. Through changing the parameters of the sensor structure, we can get sensor optimal structure parameters that can make the sensor with the best resonance frequency and acceleration sensitivity. Second, the sensor is fabricated based on the optimal structure parameters. Finally, the sensor is studied by the shaking table test. The experimental results show that the resonant frequency of the developed vibration sensor is 80.74 Hz, and the acclelration sensitivity is about 20.85 pm/m·s-2. Amplitude-frequency characteristics of the sensor in the 5-50 Hz frequency range show a flat horizontal line. The proposed sensor is suitable for the low-frequency (5-50 Hz) vibration signal detection.

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