High‐Sensitivity Air‐Coupled Ultrasonic Imaging with the First‐Order Symmetric Lamb Mode at Zero Group Velocity

dc.contributor.author Holland, Stephen
dc.contributor.author Holland, Stephen
dc.contributor.author Chimenti, Dale
dc.contributor.department Aerospace Engineering
dc.date 2018-02-13T03:17:42.000
dc.date.accessioned 2020-06-29T22:44:49Z
dc.date.available 2020-06-29T22:44:49Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2004
dc.date.embargo 2012-11-20
dc.date.issued 2003-07-01
dc.description.abstract <p>A new method for high‐sensitivity non‐contact, through‐transmission, air‐coupled imaging of small material property changes or discontinuities in plates is demonstrated. Our approach exploits the excitation of the first‐order symmetric Lamb wave mode at its minimum frequency point of zero group velocity. Because this Lamb wave resonance couples energy extremely efficiently with the air and does not propagate energy in the plane of the plate, it is the dominant mode of transmission of an airborne focussed‐beam broadband impulse through the plate. We take advantage of the sensitivity of this mode by performing C‐scans at the frequency of the group‐velocity zero to image spatial discontinuities and property changes. Our results show that images measured at this frequency are more sensitive and more consistent than those measured elsewhere in the plate‐wave spectrum.</p>
dc.description.comments <p>Copyright 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.</p> <p>This article appeared in <em>AIP Conference Proceedings</em>, 700 (2004): 687–693 and may be found at <a href="http://link.aip.org/link/doi/10.1063/1.1711688">http://dx.doi.org/10.1063/1.1711688</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/aere_conf/15/
dc.identifier.articleid 1017
dc.identifier.contextkey 3481806
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath aere_conf/15
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1891
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/aere_conf/15/Holland_2004_HighSensitivityAirCoupled.pdf|||Fri Jan 14 20:30:01 UTC 2022
dc.subject.disciplines Aerospace Engineering
dc.subject.keywords ultrasonic imaging
dc.subject.keywords nondestructive testing
dc.subject.keywords plates (structures)
dc.subject.keywords Lamb shift
dc.subject.keywords dispersion hardening
dc.subject.keywords signal processing
dc.subject.keywords nondestructive evaluation
dc.title High‐Sensitivity Air‐Coupled Ultrasonic Imaging with the First‐Order Symmetric Lamb Mode at Zero Group Velocity
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication dea444ce-079d-483e-8db1-c33100203381
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
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