Laser-Ultrasonic attenuation and absorption measurements in metals

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Conference38th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), University of Vermont, Burlington, Vermont, US, July 17-22, 2011, 2011-07-17, Burlington, VT, US
SubjectLaser Ultrasonics; Ultrasonic Absorption; Scattering; Diffusion regime; Zero group velocity
AbstractThe attenuation of an acoustic wavefront in metals comes from scattering caused by grain anisotropy and random grain orientation and from absorption caused by mechanisms such as dislocation and magnetic domain motion. In this paper laser ultrasonics, with its non-contact and broadband characteristics, is used for measuring and separating these two attenuation contributions as a function of frequency. Results obtained from the well-known pulse-echo method and reverberation technique are presented first. Then, a more recent approach using a time-frequency analysis with zerogroup velocity (ZGV) resonances is considered. It is shown that the attenuation with scattering and absorption components is obtained by fitting the temporal decay of the resonances of the coherent field, and that only the absorption component is obtained from the temporal decay of the diffuse field between resonances.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number54354
NPARC number18968550
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Record identifiera5ccad3e-a6d6-4ed2-a26c-07176be45515
Record created2011-11-25
Record modified2016-05-09
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