Fiber grating acceleration vibration sensor with double uniform strength cantilever beams

Abstract

A fiber Bragg grating(FBG) acceleration vibration sensor based on the double uniform strength cantilever beams is developedFirst,the simulation is conducted by ANSYS softwareWe can obtain the sensor amplitude-frequency and phase-frequency characteristics in each damping ratioThrough 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 sensitivitySecond,the sensor is fabricated based on the optimal structure parametersFinally,the sensor is studied by the shaking table testThe experimental results show that the resonant frequency of the developed vibration sensor is 8074 Hz,and the acclelration sensitivity is about 2085 pm/m·s-2Amplitude-frequency characteristics of the sensor in the 5-50 Hz frequency range show a flat horizontal lineThe proposed sensor is suitable for the low-frequency(5-50 Hz) vibration signal detection