K-1 レーザ漏洩波探傷法を用いた微小き裂可視化技術の開発(測定技術・映像法・非破壊検査)

概要

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A new method for visualizing surface small cracks on underwater components has been developed. An intense laser pulse is irradiated onto a surface of underwater component, surface acoustic wave (SAW) is generated through ablation process. A leaky wave is generated into water due to an interaction between the SAW and the crack. The other detection laser beam, which propagates in the water and is reflected by a properly designed reflector, coupled with optical interferometer can sensitively detect this leaky wave. By scanning these laser beams 2-dimensionally, crack image can be obtained with as high spatial resolution like the liquid penetrant testing. A typical experimental result of visualizing a crack having less than lOum crack opening on weld metal is introduced.
超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会の論文
2006-11-15