2-D Medium–High Frequency Fiber Bragg Gratings Accelerometer

A 2-D fiber Bragg grating (FBGs) accelerometer is proposed and experimentally demonstrated in this paper. The accelerometer is composed of a universal flexure hinge and two FBGs in which the FBGs are vertically attached on the surface of the hinge. The sensing characteristics of the accelerometer are analyzed theoretically. The theoretical analysis results show that the proposed device has a linear response to applied acceleration and it was confirmed by the experiments. The experimental results show that the resonant frequencies of the accelerometer are 1050/1060 Hz in the x/y direction, respectively. The accelerometer has a wide frequency response from 50 to 900 Hz and a large sensitivity ~13.1/12.0 pm/G in the x/y direction, respectively. The maximum measurable acceleration reaches 200 G and the dynamic range is 80 dB. These unique characteristics make the accelerometer as an excellent candidate in various vibration signals monitoring field.