Abstract
The formula of vertical energy attenuation of Rayleigh waves in a semi-infinite substrate with a fluid layer has been derived. It was tested and verefied by ultrasonic experiments on thick aluminum plates with long man-made slots. A quantitative agreement was obtained between experiment and theory. Moreover, tomographic experiments were performed. The tomographic image can provide information concerning not only the two-dimension location and nature of defects, but also the position of defects in the vertical direction.
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