Sensitivity of defect detections in elbow pipes using guided waves was evaluated. The artificial defects introduced at several locations of the elbows were evaluated using the T(0,1) mode at three frequencies (30, 40 and 50 kHz). It was confirmed that, at 30 kHz, the sensitivities of the defects inside the elbow were higher than those outside the elbow while sensitivities of the defects inside the elbow were lower than those outside the elbow at 50 kHz. The experimental results were discussed with the propagation phenomena obtained by the FEM simulations.
