The ultrasonic field of a Gaussian transducer

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Abstract
A transducer is described which produces a Gaussian distribution of amplitudes along a radial dimension. The ultrasonic beam produced by this transducer is examined both experimentally and mathematically and is shown to have none of the zeros of amplitude in the Fresnel region, and none of the secondary maxima in the Fraunhofer region characteristic of the piston transducer. Applications both to verification of physical theories and to nondestructive evaluation situations are mentioned.

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