Examination of the epicentral waveform for laser ultrasound in the melting regime

S. J. Reese, Z. N. Utegulov, F. Farzbod, R. S. Schley, D. H. Hurley

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    A laser ultrasonic source just below the ablation regime is examined by recording an epicentral waveform in a high purity tungsten sample. Using pulse energy as a parameter, a slight delay in the shear wave arrival time is observed upon transition to the melting regime. This phenomenon is attributed to a change in character of the ultrasonic source. In the thermoelastic regime, shear waves are generated by mode conversion at the sample surface of longitudinal waves emanating from subsurface sources. Just above the melting threshold, a molten pool forms in the center of the generation volume. Shear waves are not supported by the molten pool. As a result, shear waves generated from off-axis thermoelastic sources are weighted more heavily. This results in a delay of the shear wave arrival time.

    Original languageEnglish
    Pages (from-to)799-802
    Number of pages4
    JournalUltrasonics
    Volume53
    Issue number3
    DOIs
    Publication statusPublished - Mar 2013

    Fingerprint

    S waves
    waveforms
    examination
    melting
    lasers
    arrivals
    ultrasonics
    longitudinal waves
    ablation
    tungsten
    purity
    recording
    thresholds
    pulses
    energy

    Keywords

    • Ablation
    • Epicentral waveform
    • Laser ultrasound
    • Melting point
    • Thermoelastic

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics

    Cite this

    Examination of the epicentral waveform for laser ultrasound in the melting regime. / Reese, S. J.; Utegulov, Z. N.; Farzbod, F.; Schley, R. S.; Hurley, D. H.

    In: Ultrasonics, Vol. 53, No. 3, 03.2013, p. 799-802.

    Research output: Contribution to journalArticle

    Reese, S. J. ; Utegulov, Z. N. ; Farzbod, F. ; Schley, R. S. ; Hurley, D. H. / Examination of the epicentral waveform for laser ultrasound in the melting regime. In: Ultrasonics. 2013 ; Vol. 53, No. 3. pp. 799-802.
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