NDE of zinc layer on steel substrate using laser-ultrasonic SAW

  1. Get@NRC: NDE of zinc layer on steel substrate using laser-ultrasonic SAW (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1117/12.469621
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Proceedings titleNondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems
Series titleProceedings of SPIE; no. 4703
ConferenceSPIE Conference on NDE for Health Monitoring and Diagnostics
Subjectlaser-ultrasound; SAW; Rayleigh acoustic wave; NDE; multilayered media; coating; conjugate gradients
AbstractLaser-ultrasound spectroscopy, a non-contact ultrasonic technique was used to characterize the Lame coefficients (λ, μ) and thickness (h) of a zinc layer on a steel substrate. This characterization is based on fitting the measured velocity dispersion curve of surface acoustic waves (SAW) to the dispersion calculated one using the conjugates gradients algorithm (C.G). A short laser pulse was used to generate a wideband pulse of ultrasound and a laser interferometer was used for its detection. From a large number of echoes we identified the one corresponding to the SAW. Furthermore other useful information were obtained from these data like attenuation and surface skimming longitudinal wave. Measurements of the velocity dispersion of the Rayleigh wave were achieved up to 50 MHz. The evaluation of layer's parameters performed for similar cases, on a pseudo-experimental model, were obtained with accuracy better then 1% for (h, μ) and about 4% to 6% for λ.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21273114
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Record identifier6d126ffc-c28c-4dfb-95a5-1225600bd12c
Record created2014-12-15
Record modified2016-05-09
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