Ultrasonic field patterns and broadband imaging-simulations in transversely isotropic media

dc.contributor.author Spies, M.
dc.contributor.author Fellinger, P.
dc.contributor.author Schleichert, U.
dc.contributor.author Langenberg, K.
dc.date 2018-02-14T02:50:56.000
dc.date.accessioned 2020-06-30T06:40:19Z
dc.date.available 2020-06-30T06:40:19Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1993
dc.date.issued 1993
dc.description.abstract <p>Thorough application of NDE — and imaging techniques in anisotropic media has to overcome those inherent problems like beam splitting, beam distortion and deviation between wave propagation direction and energy flow, known as beam skewing. A theory of elastic wave propagation in transversely isotropic media which properly accounts for these effects has been presented previously [1], an overview has been presented at last year’s conference [2]. Analytic expressions have been derived characterizing the propagation of Gaussian Wave Packets (GWPs) in these media thus making possible the simulation of real pulse propagation. In order to provide information from a practical point of view the theory has been evaluated to yield field patterns of GWPs in unidirectional graphite-epoxy as well as centrifugally cast stainless steel. The plane wave spectral decomposition of Green’s dyadic and triadic functions, also presented last year, has been used to derive the algorithm of forward-backward-propagation of elastic wavefields yielding a simple solution to the inverse problem, the so-called elastodynamic holography. With this basic imaging technique, field distributions of GWPs are propagated forth and back; for comparison, the conventional isotropic algorithm [3] is also applied, resulting in field distributions which differ both in intensity and position. Finally the simulations, being evaluated in frequency domain, are performed at multiple frequencies thus in principle making up a mode-matched FT-SAFT [4], neglecting the vector scattering amplitudes.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/qnde/1993/allcontent/15/
dc.identifier.articleid 1252
dc.identifier.contextkey 5774025
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/1993/allcontent/15
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/60102
dc.language.iso en
dc.relation.ispartofseries Review of Progress in Quantitative Nondestructive Evaluation
dc.source.bitstream archive/lib.dr.iastate.edu/qnde/1993/allcontent/15/1993_Spies_UltrasonicField.pdf|||Fri Jan 14 20:30:47 UTC 2022
dc.source.uri 10.1007/978-1-4615-2848-7_15
dc.subject.disciplines Acoustics, Dynamics, and Controls
dc.subject.disciplines Signal Processing
dc.title Ultrasonic field patterns and broadband imaging-simulations in transversely isotropic media
dc.type event
dc.type.genre article
dspace.entity.type Publication
relation.isSeriesOfPublication 289a28b5-887e-4ddb-8c51-a88d07ebc3f3
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