Design and experimental Validation of an FBG accelerometer using Cantilever-Hinge structures

The FBG accelerometer, due to its advantages such as high sensitivity, wide frequency response, immunity to electromagnetic interference, strong corrosion resistance, and miniaturization, has wide applications in engineering fields. Under the premise of ensuring the sensor's quality factor (Q), this paper introduces an FBG accelerometer featuring a cantilever-hinge structure, which effectively reduces the design and manufacturing complexity of the accelerometer. The accelerometer model is established using vibration theory, with structural optimization and simulation conducted in MATLAB and ANSYS. The accelerometer's performance was evaluated through experimental testing. The study indicates that the accelerometer's resonance frequency is 510 Hz, with a smooth frequency response between 0.1 Hz and 150 Hz. Its sensitivity is 54.12 pm/g, while the cross-sensitivity is under 9.7 %. This study offers a new approach to optimizing FBG accelerometer design, facilitating its broader engineering applications.