抄録
Recently, ultrasonic flaw detection among the non-destructive testing is used extensively. Generation laser scanning method is known as one of the ultrasonic flaw techniques, and it has an advantage that defects are easily visualized as a time-resolved damaged region image. In this study, we propose improvement methods of detection accuracy as follows; (i)extraction of A_0 signal from A-mode wave which is one of the Lamb waves, (ii)compensation of the attenuated intensity during wave propagation. In addition, the optimization of sensor position was carried out. For CFRP laminates and aluminum plates with surface/internal detects, the improvement of image quality was achieved by the combination of these methods.
