A Fiber Bragg Grating acceleration sensor with temperature compensation

A Fiber Bragg Grating(FBG) accelerometer based on a composite beam is proposed. Owing to the opposite movement of the two FBGs, the influence of temperature can be reduced and the sensitivity can be improved by the difference operation of FBGs’ center wavelength shift. Through theoretical analysis and simulation of the proposed sensor, the sensor structure parameters are determined. The theory of the proposed sensor is verified by experiments, and the experimental results show that the temperature impact on the sensor structure is reduced to 0.47 pm/℃ in the range of 25–75 ℃. The accelerometer has a good response flat region at 40–140 Hz and the sensitivity is 234.5 pm/g. The orthogonal crosstalk of the accelerometer is −21.01 dB. The proposed FBG acceleration sensor has a good application prospect in low-frequency oil and gas seismic exploration.