Distributed feedback fiber laser rosette for acoustic emission detection

摘要

This study aims at providing a practical method in large structure health monitoring.A novel fiber optic rosette based on distributed feedback (DFB) fiber laser for acoustic emission (AE)detection and location is presented.The ultra-narrow line width of the DFB fiber laser will result in high resolution in AE wave detection using a fiber optic interferometric demodulation method.The directivity of the fiber optic rosette is investigated.A rosette with three DFB fiber lasers is tested in the experiment to determine the direction of propagation of AE waves.