Laser Detection and Imaging Techniques for Surface Examination

dc.contributor.author Ameri, S.
dc.contributor.author Ash, Eric
dc.contributor.author Htoo, U.
dc.contributor.author Murray, D.
dc.contributor.author Wickramasinghe, H.
dc.date 2018-02-13T17:45:02.000
dc.date.accessioned 2020-06-30T01:28:41Z
dc.date.available 2020-06-30T01:28:41Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 1980
dc.date.embargo 2013-11-19
dc.date.issued 1980-07-01
dc.description.abstract <p>A coherent laser probe provides the basis for the recording of complex SAW distributions. Using three or more scans, the surface wave velocity can be deducep with an accuracy of a few parts in 10<sup>5</sup>. Such measurements are sufficiently sensitive to detect small changes in surface characteristics; as an example, results will be presented on the effect of doping a Si surface. It is also possible to improve the accuracy of the basic elastic constants of the material by reference to the velocity characteristic. Of particular importance is the fact that this technique provides evidence on the effective value of these constants close to a surface; it is, therefore potentially useful for surface layer characterisation. Surface defects can be detected by means of scattered waves in both the forward as the reverse directions. In principle, either can be used to "image" the defect. Using both these components, the defect size and location can be determined with improved accuracy.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/cnde_yellowjackets_1979/55/
dc.identifier.articleid 1058
dc.identifier.contextkey 4834517
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cnde_yellowjackets_1979/55
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/16096
dc.language.iso en
dc.relation.ispartofseries Interdisciplinary Program for Quantitative Flaw Definition Annual Reports
dc.source.bitstream archive/lib.dr.iastate.edu/cnde_yellowjackets_1979/55/1979_YellowJacket_058_Ameri_LaserDetection.pdf|||Sat Jan 15 00:54:50 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.keywords Nondestructive Evaluation
dc.title Laser Detection and Imaging Techniques for Surface Examination
dc.type article
dc.type.genre 10_ultrasonics_surface_waves
dspace.entity.type Publication
relation.isSeriesOfPublication 43920e40-d127-4f4c-9087-dc709815fe7f
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