Show simple item record

dc.contributor.advisorMichaels, Jennifer E.
dc.contributor.authorDawson, Alexander James Wayne
dc.date.accessioned2016-01-07T17:23:18Z
dc.date.available2016-01-07T17:23:18Z
dc.date.created2015-12
dc.date.issued2015-08-19
dc.date.submittedDecember 2015
dc.identifier.urihttp://hdl.handle.net/1853/54345
dc.description.abstractA method for acquiring and analyzing ultrasonic wavefields to characterize scattering from defects is described. A laser vibrometer and XY scanner are used to record high resolution wavefield data for angle-beam waves propagating in both a defect-free plate and a plate containing crack-like defects emanating from a through-hole. The properties of angle-beam wave propagation are first studied, which include wave generation mechanisms, propagation trajectories, and apparent phase velocities on the measurement surface. Scattering from a defect of interest is then analyzed by subtracting wavefields recorded before and after introduction of the defect. Wavefield subtraction is very sensitive to unavoidable spatial misalignment, which must be corrected prior to subtraction. Two methods for aligning wavefield data sets prior to subtraction are described and their performance is assessed. Several methods for characterizing scattering, including radial energy plots and scattering patterns, are described and used to quantify scattering from the introduced defects. Finally, efficacy of the scattering characterization methods is discussed and recommendations are made for future work.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectUltrasonic
dc.subjectNDE
dc.subjectAngle-beam
dc.subjectWavefield measurements
dc.titleAcquisition and analysis of ultrasonic wavefield data to characterize angle-beam propagation and scattering in plates
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentElectrical and Computer Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberAl-Regib, Ghassan
dc.contributor.committeeMemberRuzzene, Massimo
dc.contributor.committeeMemberMichaels, Thomas E.
dc.contributor.committeeMemberLanterman, Aaron D.
dc.date.updated2016-01-07T17:23:18Z


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record