A flexible hinge FBG accelerometer based on PSO algorithm

Abstract

We propose a Fiber Bragg Grating (FBG) accelerometer based on a compound hinge structure, which takes into account the motion accuracy and the rotational range, combining the advantages of elliptical and circular hinges. According to the theoretical formulas for the resonant frequency and sensitivity of the sensor, we establish an optimization model for the sensor and optimize the key structural parameters using the particle swarm optimization (PSO) algorithm. We set up a vibration experimental platform to test the performance of the sensor. The results show that the resonant frequency is approximately 512 Hz, the sensitivity is 116 pm/g, the linearity is above 0.999, and the cross sensitivity is only 4.1 %. Additionally, the figure of merit is up to 59392 pm·Hz/g, which indicates that this sensor has good comprehensive characteristics after optimization by the PSO algorithm.