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Proceedings Paper

Spatially-phased transducer to form steered beams
Author(s): W. Jack Hughes; Charles W. Allen
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Paper Abstract

A spatially phased `doily' transducer (patent pending) forms a steered beam along one axis of the transducer without the need for electronically applying phase shifts to an array of elements. In its simplest form, the transducer consists of two channels from spatially shaped cosine and sine apertures, where the sine channel is shifted 90 degree(s) and then combined with the cosine channel. The transducer produces a beam steered to a desired angle at a specific design frequency in either receive or transmit operation. Several `doily' transducers have been fabricated and tested using low-lateral mode transducer materials such as Polyvinylidene Fluoride and 1 - 3 composite, with electroplated electrodes to form the cosine and sine apertures. The apertures were also geometrically shaped to suppress sidelobes along the steering axis. These `doily' transducers formed beams that were steered as far as 54 degree(s) with typical sidelobe levels of -20 dB.

Paper Details

Date Published: 21 June 1999
PDF: 9 pages
Proc. SPIE 3664, Medical Imaging 1999: Ultrasonic Transducer Engineering, (21 June 1999); doi: 10.1117/12.350668
Show Author Affiliations
W. Jack Hughes, The Pennsylvania State Univ. (United States)
Charles W. Allen, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 3664:
Medical Imaging 1999: Ultrasonic Transducer Engineering
K. Kirk Shung, Editor(s)

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