The effect of laser characteristics in the generation and propagation of laser generated guided waves in layered-skin model

Adèle L'Etang, Zhihong Huang

    Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

    1 Citation (Scopus)

    Abstract

    This paper concerns the use of surface acoustic waves for accurate characterization of human skin, it presents a Finite Element (FE) study of the laser generated ultrasonic waves in a 3-layered models of human skin to study the effects of laser characteristics has on the properties of the generated Surface Acoustic Waves (SAWs). Using the commercially available FE code ANSYS, the effects of laser beam width, pulse rise time and laser wavelength has been taken into consideration on the generated guided waves in the skin models. The simulation is a sequential coupled field analysis, with the heating of the multilayered skin model due to a short laser pulse is simulated by a dynamic thermal analysis with the laser pulse represented as a volumetric heat generation. The results of the thermal analysis are then subsequently applied as a load in the mechanical analysis where the out-of-plane displacement histories and stress fields are analyzed. The two analyses can be assumed to be uncoupled in this work as in the timescale of interest the elastic effects do not feed back into the thermal problems. In order to keep the generation of ultrasonic waves in the thermoelastic regime the energy incident on the tissue must be kept below the threshold at which irreversible changes occur, yet sufficient to produce thermoelastic waves that can be readily detected. Results shows that the laser generated SAW in skin models is dominated by the optical penetration depth which is determined by the properties of the material and the laser wavelength used.
    Original languageEnglish
    Title of host publication4th European Conference of the International Federation for Medical and Biological Engineering
    Subtitle of host publicationECIFMBE 2008
    EditorsJos Vander Sloten, Pascal Verdonck , Marc Nyssen, Jens Haueisen
    Place of PublicationBerlin
    PublisherSpringer
    Pages2587-2591
    Number of pages5
    ISBN (Electronic)9783540892083
    ISBN (Print)9783540892076
    DOIs
    Publication statusPublished - 2009
    Event4th European Conference of the International Federation for Medical and Biological Engineering - Antwerp, Belgium
    Duration: 23 Nov 200827 Nov 2008

    Publication series

    NameIFMBE proceedings
    PublisherSpringer
    Volume22
    ISSN (Print)1680-0737

    Conference

    Conference4th European Conference of the International Federation for Medical and Biological Engineering
    CountryBelgium
    CityAntwerp
    Period23/11/0827/11/08

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