Abstract
The far field and near field of an ultrasonic circular transducer with a Bessel distribution of vibrational amplitude on its surface are calculated. The vibrational characteristics of ultrasonic transducers consisting of a ceramic ring filled with a plastic disk are considered. Assuming that the amplitude on the surface of the plastic disk inside the ring is described by the Bessel function of zero order, the directivity patterns (in air) were calculated. The directivity characteristics of those transducers measured experimentally are presented. >
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