Abstract
Analytical expressions are obtained for the reflection coefficient of a bonded ultrasonic beam from a periodic stress-free solid surface. The frequency dependence of the reflection coefficient shows a sharp minimum at a frequency which corresponds to an apparent “displaced” beam coupled along the interface and “leaks” back to the solid. These leaky waves are produced by the periodically rough surface at the solid-air boundary. These leaky waves are observed by an experimental setup using broadband ultrasonic pulses. The effects of finite beam on the reflected amplitude in the time and frequency domain will be discussed. Experimental results are in good agreement with theoretical prediction. [This work is supported by the National Science Foundation.]
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