Title:
Application of Image Processing Techniques for Lamb Wave Characterization

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dc.contributor.advisor Jacobs, Laurence J.
dc.contributor.author Kotte, Timo Oliver en_US
dc.contributor.committeeMember DesRoches, Reginald
dc.contributor.committeeMember Qu, Jianmin
dc.contributor.department Civil and Environmental Engineering en_US
dc.date.accessioned 2005-03-01T19:23:14Z
dc.date.available 2005-03-01T19:23:14Z
dc.date.issued 2004-08-20 en_US
dc.description.abstract Characterization of dispersion curves in plate-like structures is possible with guided Lamb waves. In this research, experimental development of dispersion curves relies on the spectrogram, which suffers from the Heisenberg Uncertainty Principle. Reassignment is capable of localizing ill--defined dispersion curves. Unfortunately, reassignment also introduces spurious components, which reduce reassignment performance. This research develops an algorithm that provides both localization of dispersion curves and elimination of spurious components. To achieve this, an alternative formulation of reassignment called differential reassignment is modified and superimposed with nonlinear anisotropic diffusion. This study first examines reassignment and diffusion components individually. Three different versions of differential reassignment are considered, two of which are modifications explicitly derived in this research. The combined algorithm is then applied to reassign experimentally measured spectrograms, leading to a significant increase in clarity and notch detection performance. en_US
dc.description.degree M.S. en_US
dc.format.extent 15186126 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/4787
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Notch detection en_US
dc.subject Reassignment
dc.subject Spectrogram
dc.title Application of Image Processing Techniques for Lamb Wave Characterization en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Jacobs, Laurence J.
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 5af40958-ece2-4a76-b071-5ba4c6d99d80
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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