A novel fiber Bragg grating acceleration sensor for measurement of vibration

A novel fiber Bragg grating (FBG) acceleration sensor for measurement of vibration is proposed. The sensor is fabricated by embedding a FBG into an aluminum cylinder, in which the optical wave propagated is coupled with the strain wave when the vibration is applied on the aluminum cylinder. The wavelength shifts of the FBG are proportional to the vibration acceleration. Employing FBG interrogation system, the wavelength shifts are converted into the change of optical power to achieve vibration measurement. Experiments indicate that the FBG acceleration sensor provides a flat frequency response from 800 Hz to 5000 Hz and sensitivity of 5.3 mV/g at 3000 Hz. The linear characteristic is good and the coefficient of determination is better than 0.996. In addition, the accuracy of the sensing system and the effect of temperature are investigated.