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TECHNICAL BRIEFS

Thermal Diffusivity Estimation in a Picosecond Photoreflectance Experiment

[+] Author and Article Information
Jean-Luc Battaglia

Laboratoire inter Établissement ‘TRansferts Ecoulements Fluides Energétique’, UMR 8508, Ecole Nationale Supérieure d’Arts et Métiers, Esplanade des Arts et Métiers, 33405 Talence Cedex, Francejean-luc.battaglia@ensam.bordeaux.fr

Andrzej Kusiak, Jean-Christophe Batsale

Laboratoire inter Établissement ‘TRansferts Ecoulements Fluides Energétique’, UMR 8508, Ecole Nationale Supérieure d’Arts et Métiers, Esplanade des Arts et Métiers, 33405 Talence Cedex, France

J. Heat Transfer 129(6), 756-758 (Aug 29, 2006) (3 pages) doi:10.1115/1.2717252 History: Received March 01, 2006; Revised August 29, 2006

The aim of this work is to provide an analytical expression for the thermal diffusivity of a material in the configuration of the picosecond photoreflectance experiment. It is shown that the thermal diffusivity can be estimated from the absorption depth of the pump beam together with the probe beam as well as the time when the two asymptotic behaviors of the impulse response cross. Thereby, it is not required to measure absolute values of incident heat flux and average temperature on the aiming area.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Schematic description of the photoreflectance experiment

Grahic Jump Location
Figure 2

Influence of heating laser penetration depth on the impulse response (with βp=βh) (NFR denotes the non-Fourier regime)

Grahic Jump Location
Figure 3

Influence of the penetration depth of the probe laser on the impulse response

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