A hybrid PZT-FBG sensing-based damage detection

In this paper authors investigated elastic guided wave-based damage localization in thin panel made out of isotropic material. Elastic waves excitation is based on piezoelectric transducer. Wave sensing is based on Fiber Bragg Gratings (FBG) strain sensors and piezoelectric sensors. Piezoelectric transducers are very popular in applications related to elastic wave generation and sensing. The FBG strain sensors utilized in the past for quasi static or quasi-static strain sensing are more and more utilized in field of elastic wave sensing. In the case of FBG sensors the edge filtering method is utilized. In this purpose tunable laser source is used. Received optical signal is converted to the voltage signal based on photodetector. Attention in this research was focused on dual sensing using FBGs. For this purpose, pair of FBG sensors located on the top and bottom surface is utilized. Damage localization is based on delay-and-sum algorithm. In this paper experimental results are presented.