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29 December 1999 Thermal characterization of nonhomogeneous materials by photothermal radiometry
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Proceedings Volume 4016, Photonics, Devices, and Systems; (1999)
Event: Photonics Prague '99, 1999, Prague, Czech Republic
Although the mechanism of heat transport is a typical diffusion process, in cases in which the heat source is of a sinusoidal type, it may be found convenient to transform the Fourier diffusion equation in a formal Helmolz equation, speaking of thermal waves. In the present paper we will use this formalism for handling data from a photothermal measurement to retrieve the profile of thermal diffusivity under the surface of a solid material, showing that the surface temperature field obtained by the photothermal method can be connected to the thermal properties of the material in a simple and elegant way by using the concept of thermal waves scattering by the small thermal inhomogeneities of the material.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mario Bertolotti, Roberto Li Voti, G. L. Liakhou, Stefano Paoloni, and Concita Sibilia "Thermal characterization of nonhomogeneous materials by photothermal radiometry", Proc. SPIE 4016, Photonics, Devices, and Systems, (29 December 1999);

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