A computer technique for near-field analysis of ultrasonic transducer.
Griggs, Carlton Albert.
Powers, John P.
Powers, V. Michael
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A computer technique for obtaining near-field crosssection views of an ultrasonic field is presented. The technique is applied to ultrasonic transducer radiation patterns with sample contour drawings of several crosssections. A spatial frequency spectrum formulation of diffraction theory is chosen for the computations which are performed with the aid of a fast Fourier transform routine. By experimentation an actual ultrasonic field was generated using a quartz transducer and the field was measured in a cross-sectional plane. A computer generated drawing of the measured data is compared to the drawing of a computer generated prediction of the field at the same plane. The computer model is applied to an array of transducers to investigate the resulting ultrasonic field, as a preliminary use of the technique for array design.
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