A novel fiber Bragg grating acceleration sensor based on the double-hinge structure

A novel fiber Bragg grating (FBG) acceleration sensor with the double-hinge structure is designed and analyzed. The influence of the structural parameters on the sensor characteristics is determined theoretically and the structural parameters are optimized by the finite element method. By adopting the optimal structural parameters, the double hinge structure is prepared with 304 stainless steel and the FBG which is pasted on the surface of the two hinges is used to measure the acceleration sensing characteristics. Experimental results reveal flat response in the vibration frequency range of 50 ~ 600 Hz and sensitivity of 300 mV/g at 600 Hz. At the same time, the operational frequency range and sensitivity can be adjusted to accomplish a wide dynamic range and high sensitivity by optimizing the hinge parameters.