Beamforming with Acoustic Lenses and Filter Plates
A survey is presented of a variety of known acoustic beamforming methods and techniques using acoustic lenses and filter plates as receivers, the former leading to receiving beams with frequency dependent or variable beamwidths and the latter to beam formation with frequency independent or constant beamwidths. In addition, a potentially useful method of forming approximately frequency independent receiving beams using twisted wavefront acoustic lenses based on a concept going back to Morris and Tucker is outlined. As transmitters it is noted that acoustic lenses are generally of little use because of power radiation limitations imposed by cavitation, but as receivers they have much in their favor.
KeywordsMicrowave Rubber Radar Retina Polystyrene
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