A Nonlinear Ultrasonic Imaging System for Detecting Minute Damage and Defects of nm Gaps in Industrial Materials

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  • ナノメートルオーダーの隙間を持つ微細損傷・不完全結合部検出のための非線形超音波画像化システム
  • ナノメートルオーダー ノ スキマ オ モツ ビサイ ソンショウ フカンゼン ケツゴウブ ケンシュツ ノ タメ ノ ヒセンケイ チョウオンパ ガゾウカ システム

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A nonlinear ultrasonic imaging system is developed for detecting and imaging of minute damage and defects of nm gaps in industrial materials, which are undetectable by conventional ultrasonic testing. A high powered pulser to excite large amplitude incident waves and high pass or band pass filters to extract the 2nd harmonic are combined with the conventional ultrasonic imaging system. The system is applied to visualize fiber/matrix debonding or matrix crackings in CFRP or FRM laminated plates. It also visualizes anomalous substructures in amorphous diffusion bonded interfaces. This system is also useful for detecting semi-closed cracks with an opening of nm order.

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