Longitudinal Wave Precursor Signal from an Optically Penetrating Thermoelastic Laser Source

dc.contributor.author Conant, R.
dc.contributor.author Telschow, K.
dc.date 2018-02-14T04:43:43.000
dc.date.accessioned 2020-06-30T06:35:35Z
dc.date.available 2020-06-30T06:35:35Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 1989
dc.date.issued 1989
dc.description.abstract <p>The thermoelastic laser ultrasonic source depends on the optical absorption of energy at the sample surface to produce a volumetric expansion. This paper presents the results of calculations and measurements on the effects of optical penetration of the laser beam into the sample and the elastic waveforms produced. A central result is prediction of a sharp longitudinal waveform that precedes the main waveform and is very similar to that observed with an ablative source (normal point force). The shape of this precursor signal is strongly dependent on the optical penetration depth of the material. A basic explanation of the origin of the precursor signal is given in terms of a one-dimensional model using point sources imbedded within the material. Experimental measurements on a material with a substantial optical penetration depth directly confirm calculations using 2-D integral transform techniques by taking into account the temperature variation with depth.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/qnde/1989/allcontent/62/
dc.identifier.articleid 1938
dc.identifier.contextkey 5783915
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/1989/allcontent/62
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/59433
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/qnde/1989/allcontent/62/1989_Conant_LongitudinalWave.pdf|||Sat Jan 15 01:17:59 UTC 2022
dc.source.uri 10.1007/978-1-4613-0817-1_62
dc.subject.disciplines Acoustics, Dynamics, and Controls
dc.title Longitudinal Wave Precursor Signal from an Optically Penetrating Thermoelastic Laser Source
dc.type event
dc.type.genre article
dspace.entity.type Publication
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