Measurement of sensitivity of different wave modes to subsurface defects

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buir.contributor.authorAtalar, Abdullah
buir.contributor.authorKöymen, Hayrettin
buir.contributor.orcidAtalar, Abdullah|0000-0002-1903-1240
dc.citation.epage774en_US
dc.citation.spage771en_US
dc.contributor.authorAtalar, Abdullahen_US
dc.contributor.authorKöymen, Hayrettinen_US
dc.contributor.authorYemişçiler, O.en_US
dc.coverage.spatialChicago, IL, USAen_US
dc.date.accessioned2016-02-08T12:02:38Z
dc.date.available2016-02-08T12:02:38Z
dc.date.issued1988en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionDate of Conference: 2-5 October 1988en_US
dc.descriptionConference Name: 1988 IEEE Ultrasonics Symposiumen_US
dc.description.abstractExcitation of acoustic wave modes in a layered solid is investigated when the solid is immersed in a liquid. This is done by computing the reflection coefficient of acoustic plane waves at the liquid-layered-solid interface. Then, a method to evaluate the sensitivity of various modes supported in the layered structure to subsurface defects is introduced. The method involves insonification of the layered structure with a conical wave whose axis coincides with the defect. Since all the rays in the conical wavefront hit the planar interface at the same angle, it is possible to excite a single kind of mode in the layer. By adjusting the angle of inclination of the cone, it is possible to excite the modes selectively. Since the conical waves converge to a line focus at the cone axis, the excited mode will focus on the defect. By recording the reflected signal amplitude as the cone angle is varied, a curve is obtained from which it is possible to conclude the sensitivity of various modes to the subsurface flaw. The results of such measurements indicated that the generalized Lamb wave modes are more sensitive to subsurface defects than the Rayleigh waves. An imaging system which makes use of focused Lamb waves was built and the system produced images of very small subsurface defects.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T12:02:38Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 1988en
dc.identifier.doi10.1109/ULTSYM.1988.49482en_US
dc.identifier.issn0090-5607en_US
dc.identifier.urihttp://hdl.handle.net/11693/27836
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttps://doi.org/10.1109/ULTSYM.1988.49482en_US
dc.source.titleProceedings of the 1988 IEEE Ultrasonics Symposiumen_US
dc.subjectAcoustic variables measurementen_US
dc.subjectAcoustic plane wavesen_US
dc.subjectAcoustic wave modesen_US
dc.subjectLamb wave modesen_US
dc.subjectLayered soliden_US
dc.subjectSubsurface defectsen_US
dc.subjectUltrasonic wavesen_US
dc.titleMeasurement of sensitivity of different wave modes to subsurface defectsen_US
dc.typeConference Paperen_US

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