Spatially-phased transducer to form steered beams

W. Jack Hughes; Charles W. Allen

doi:10.1117/12.350668

21 June 1999 Spatially-phased transducer to form steered beams

W. Jack Hughes, Charles W. Allen

Proceedings Volume 3664, Medical Imaging 1999: Ultrasonic Transducer Engineering; (1999) https://doi.org/10.1117/12.350668
Event: Medical Imaging '99, 1999, San Diego, CA, United States

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.

Citation Download Citation

W. Jack Hughes and Charles W. Allen "Spatially-phased transducer to form steered beams", Proc. SPIE 3664, Medical Imaging 1999: Ultrasonic Transducer Engineering, (21 June 1999); https://doi.org/10.1117/12.350668

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