抄録
Ultrasonic flaw detection and sizing are important issues for ensuring structural reliability of industrial plants. However if the flaws are close to each other, the detection performance becomes lower. The Time-of-Flight Diffraction (TOFD) method is known as the most accurate flaw sizing method. However the TOFD method is unsuitable for sizing of such neighboring flaws because there is scarce beam path difference between the arrival times of diffraction echoes from each flaw. On the other hand, authors suggested a new TOFD method using multiple probes in a previous study. In this study, the flaw size and position are measured by suggested method. As a result, the flaw size and position can be identified by the suggested method though there is nonnegligible identification error if the distance of neighboring flaws is small.
