Abstract
A Fourier integral solution to the problem of compressional waves radiated into a semi-infinite fluid half space from an interdigital transducer at the piezoelectric solid-fluid interface is sketched out. The Fourier integral is evaluated asymptotically by the method of steepest descents. This leads to a clear understanding of the ultrasonic beam scanning by changing the frequency. Numerical results are obtained for a PZT ferroceramic material and compared with experimental ones.
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