Document Type

Article

Publication Date

1-1991

Publication Title

Journal of Applied Physics

Abstract

A novel multistage numerical modeling approach to simulate acoustic-wave generation and propagation of an electromagnetic acoustic transducer (EMAT) is presented. the model assumes a uniform static magnetic field in a conducting half-space. A meander coil winding situated above the half-space is driven by a transient high-frequency current pulse. the numerically computed eddy currents in the conducting specimen are combined with the static magnetic field to yield spatially and temporally diffusive Lorentz forces which in turn are coupled into the elastic-wave equation. This hyperbolic elastodynamic system is solved for the displacement field vector which gives rise to propagating elastic waves. Numerical transduction results are discussed for a generic two-wire transient EMAT configuration and for an isotropic half-space with electric and acoustic material parameters equivalent to those of aluminum.

Volume

69

Issue

1

First Page Number

89

Last Page Number

98

DOI

10.1063/1.347662

Publisher Statement

© 1991, The American Institute of Physics. Available on publisher's site at http://jap.aip.org/.

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