Acoustic emission inspection based on wireless FBG sensing system

A new optical wireless sensing system to detect the acoustic emission (AE) signals generated from the monitoring structure was presented in this paper. In the sensing system, an relocatable AE sensor head based on fiber Bragg grating (FBG) was developed. Also a wireless module was connected with the designed FBG AE sensor head in a compact package. The results of the pencil lead breaking experiment indicated that the wireless FBG AE sensing system has excellent output response correspond very well to the traditional PZT AE sensor. The frequency responses of the designed system were also investigated. It has demonstrated that the system has shown a good performance in discriminating AE waves with different resonant frequencies.