Using the complex source point method the mechanism was explored by which an incident well collimated beam excites the spectrum of guided modes that can be supported in a layered structure. A single elastic plate embedded in vacuum was chosen. Results for the P and SV potentials in successive cross sections were computed by the beam tracking algorithm and by normal mode expression. Results for these cross sections, where the field initially resembles a beam and after successive reflections has become blurred to the point that any resemblance to a beam has disappeared and the wave pattern becomes oscillatory, suggests the use of a hybrid ray-mode algorithm which can be structured to encompass automatically the transition from one good observable parametrization to the other.
|Original language||English (US)|
|Title of host publication||Review of Progress in Quantitative Nondestructive Evaluation|
|Number of pages||6|
|State||Published - 1988|
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