Efficient defect detections of elbow pipes using propagation characteristics of guided waves

This paper proposes an efficient method of defect detection at elbow part of piping. The comparison between the simulation and experimental results shown in the paper implies regions with high sensitivity correspond to high-amplitude regions. The simulation results show that the locations of high-amplitude regions can be controlled by the center frequency of the input signal. Therefore, efficient defect detection at elbow part can be realized by using a suitable frequency for the target area.