Ultrasonic testing technology is an economic and efficient NDT method.

超声检测是一种经济有效的无损检测手段。

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This paper introduces an impact elastic-wave based NDT method suitable for detection of such deep cracks.

本文提出了一种基于冲击弹性波的无损检测技术（简称表面波法）。

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Conventional ultrasonic NDT method is quite incompetence for the surface fatigue crack testing of in service rotary shaft.

采用常规超声检测方法对在役转轴表面疲劳裂纹检测的效果很差。

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