Abstract
The design, fabrication, and acoustic calibration results for a new class of constant beamwidth transducers (CBTs) is presented. This experimental study extends previously reported work by Van Buren et al. [J. Acoust. Soc. Am. 73 (1983)] in which a CBT was constructed using hundreds of individual end-capped PZT ceramic cylinders. Each ceramic element assembly was wrapped in corprene to provide mechanical isolation from the massive metal housing and to provide a pressure release boundary condition. This presentation describes a new design approach which employs injection molded piezocomposite which is curved to form a spherical cap. Design equations will be presented which allow one to dimension the active spherical section for a given application. Of key importance to a successful CBT design is the proper implementation of velocity amplitude shading. The current approach uses an area shading technique that is achieved through selective electroplating of copper. The design, construction, and measured results for three different geometries, including a 0.76-m (30″) diameter unit will be discussed.
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