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Proceedings Paper

Finite element modeling for ultrasonic transducers
Author(s): Najib N. Abboud; Gregory L. Wojcik; David K. Vaughan; John Mould; David J. Powell; Lisa Nikodym
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Paper Abstract

Finite element modeling is being adopted in the design of ultrasonic transducers and imaging arrays. Impetus is accelerated product design cycles and the need to push the technology. Existing designs are being optimized and new concepts are being explored. This recent acceptance follows the convergence of improvements on many fronts: necessary computer resources are more accessible, lean, specialized algorithms replacing general-purpose approaches, and better material characterization The basics of the finite element method (REM) for the coupled piezoelectric-acoustic problem are reviewed. We contrast different FEM formulations and discuss the implications of each: time-domain versus frequency domain, implicit versus explicit algorithms, linear versus nonlinear. Beyond discussions of the theoretical underpinnings of numerical methods, the paper also examines other modeling ingredients such as discretization, material attenuation, boundary conditions, farfield extrapolation, and electric circuits. Particular emphasis is placed on material characterization, and this is discussed through an actual "modelbuild-test" validation sequence, undertaken recently. Some applications are also discussed. Keywords: Arrays, Attenuation, Finite Element Method, Imaging, Piezoelectric, Transducer, Ultrasound

Paper Details

Date Published: 1 May 1998
PDF: 24 pages
Proc. SPIE 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering, (1 May 1998); doi: 10.1117/12.308015
Show Author Affiliations
Najib N. Abboud, Weidlinger Associates, Inc. (United States)
Gregory L. Wojcik, Weidlinger Associates, Inc. (United States)
David K. Vaughan, Weidlinger Associates, Inc. (United States)
John Mould, Weidlinger Associates, Inc. (United States)
David J. Powell, Weidlinger Associates, Inc. (United States)
Lisa Nikodym, Weidlinger Associates, Inc. (United States)

Published in SPIE Proceedings Vol. 3341:
Medical Imaging 1998: Ultrasonic Transducer Engineering
K. Kirk Shung, Editor(s)

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