OS1310 フェイズドアレイ探傷画像の分解能向上に関する基礎的研究(非破壊評価と構造モニタリング,オーガナイズドセッション)

抄録

Ultrasonic flaw detection and sizing is important issue for insuring structural reliability of industrial plants. While ultrasonic phased array technique is one of the effective tools to visualize the flaws in the structural components, the spatial resolution enhancement of phased array image is still required to conduct more accurate ultrasonic testing. For this purpose, in this study, high spatial resolution phased array probe was designed by acoustic analysis by changing width, length, distance and total length of the phased array probe respectively. After that, the effectiveness of the designed phased array probe was investigated by experiment with using synthetic aperture focusing technique. However, the flaw image could not be visualized clearly because the lateral wave, back wall echo and high amplitude Rayleigh wave disturbed the received signal. Then the new visualization image was reconstructed by removing these waves and the flaw image could be visualized clearly.