352 複数モード型ラム波用電磁超音波探触子の検討(OS2-1 欠陥検出)(OS2 超音波と材料評価)  [in Japanese] 352 Study of electromagnetic acoustic transducer for multiple mode-Lamb wave  [in Japanese]

The electromagnetic acoustic transducer(EMAT) for Lamb wave, which consists of a meander coil with a distance of 2.5mm between two channels and has a symmetrical structure in the vertical direction for both surface sides of a thin steel sheet, has been researched as a flaw detector of thin steel sheets. This EMAT can generate some Lamb waves with variable wavelengths and multiple modes, and can separately generate symmetrical or anti-symmetrical mode Lamb waves.