Abstract
Certain characteristics of linear phased arrays were studied by investigating the influence of element width on the ultrasonic beam steering properties. The beam directivity patterns were analyzed and used as the criteria for determining optimal transducer design parameters. An approximate value of the critical interelement spacing, whilst squelching undesirable grating lobes, was obtained analytically using a Taylor's series expansion. The effect of element size on the pressure in the steering direction was also studied. This work showed that the influence of element size on steering characteristics is marginal and a simple solution for discrete point sources can be used as a very close approximation to that of phased arrays. It was recommended to use the largest possible element width to produce the highest pressure while suppressing the grating lobe amplitude.
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