Low-frequency FBG accelerometer based on double cantilever beam

In order to realize the precise measurement of acceleration by fiber Bragg grating, a novel double-cantilever beam fiber Bragg grating accelerometer is proposed. Firstly, the configuration and coating of the accelerometer were designed. Secondly, the principle of the fiber Bragg grating accelerometer was analyzed theoretically. The temperature response of FBGs and the acceleration response versus wavelength were analyzed. And the analytical formula of acceleration sensitivity was also deduced. Thirdly, the linear response, temperature response, resonance frequency and anti-jamming of the FBG accelerometer were researched experimentally. Experimental results indicate that the sensitivity is 7.81 pm/m/s², the relative error is 2.62%. The linearity between acceleration and wavelength is 99.8%. The temperature compensation from 67.5°C to 27.5°C is realized triumphantly. The sensor has good flat response range and faculty of anti-jamming.