A High-sensitivity FBG Accelerometer Based on a Bearing

We present the modelling, design, and characterization of a novel fiber Bragg grating (FBG) accelerometer based on a bearing. A cantilevered mechanical structure with bearings can effectively decrease energy loss during vibration and enhance sensitivity. The principle of the accelerometer is analysed by a simplified model. The influence of the structural parameters of the proposed sensor on its sensitivity and resonance frequency is further analysed for structural optimization. Meanwhile, its dynamic behaviour and frequency response characteristics are analysed by numerical simulations. In addition, dual-FBG not only enables temperature compensation but also enhances sensitivity. Experimental results indicate that the FBG accelerometer provides a linear response over a broad frequency range from 0.5 Hz to 40 Hz, with a high sensitivity of 575.8 pm/g. This FBG accelerometer with low frequency and high sensitivity provides effective support for the design of sensors of the same type.

Automated summary

This study presents a novel fiber Bragg grating (FBG) accelerometer based on a bearing, which utilizes a cantilevered mechanical structure to effectively reduce energy loss and enhance sensitivity during vibrations. The principle and structural optimization of the accelerometer are analyzed, and its dynamic behavior and frequency response characteristics are examined through numerical simulations. The dual-FBG design allows for temperature compensation and further improves sensitivity. Experimental results show that the FBG accelerometer has a linear response and high sensitivity over a broad frequency range. This low-frequency, high-sensitivity FBG accelerometer provides valuable support for the design of similar sensors.