Flextensional fiber Bragg grating-based accelerometer for low frequency vibration measurement

The intelligent structural health monitoring method,which uses a fiber Bragg grating(FBG) sensor,is a new approach in the field of civil engineering. However,it lacks a reliable FBG-based accelerometer for taking structural low frequency vibration measurements. In this letter,a flextensional FBG-based accelerometer is proposed and demonstrated. The experimental results indicate that the natural frequency of the developed accelerometer is 16.7 Hz,with a high sensitivity of 410.7 pm/g. In addition,it has a br...