A Novel Hinge Structure of Fiber Bragg Grating Acceleration Sensor

In view of the fact that existing Fiber Bragg Grating (FBG) accelerometers cannot achieve high-precision signal and high vibration frequency measurement at the same time, this paper proposes a novel type of FBG accelerometer based on the hinge structure. A novel mechanical structure of the sensor is designed, the elastic system is composed of a mass block and a flexible hinge, and the strain of the hinge amplified by the mass block is reflected by the fiber grating. Based on the analysis of the working principle of the new sensor, the influence factors of the resonant frequency and sensitivity of the sensor are studied. The mathematical model of the elliptical flexible hinge is used to optimize the design parameters of the sensor structure. The finite element analysis results show that the new structure sensor achieves the desired effect and it has a high resonance frequency (356 Hz) and sensitivity (284 pm/g).