Medium and low frequency fiber Bragg grating acceleration sensor based on single-sided single-arc hinge

A medium and low frequency fiber Bragg grating (FBG) based acceleration sensor based on single-axis single-arc hinge-shaped sensitization structure is designed and experimentally demonstrated. The theoretical formula of the sensor's resonance frequency and sensitivity was given, the stress distribution, characteristic frequency and amplitude frequency characteristics of the sensor were simulated and the structural parameters of the sensor were optimized. The experimental results show that the resonance frequency of the sensor is 630 Hz, the flat frequency range is 30–300 Hz, and the acceleration sensitivity is 57.77 pm/g. The sensor has the advantages of high sensitivity, wide flat frequency range and strong transverse anti-interference ability, which can meet the requirements of acceleration detection in petroleum exploration field.