Method for measurement of the thermal diffusivity in

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Título :	Method for measurement of the thermal diffusivity in
Palabras clave :	Photoacoustic Thermal diffusivity
Fecha de publicación :	16-ene-2013
Editorial :	Journal of Applied Physics
Descripción :	We present a method for determining the thermal diffusivity in opaque solids by means of an analysis of the photoacoustic phase signal at low modulation frequencies using the open -cell photoacoustic technique. We show for f ⩽ (π/2)2fc, where fc is the modulation frequency at which the thermal diffusion length matches the sample thickness, the photoacoustic phase signal can be written in linear form with the modulation frequency f. Then, obtaining the proportionality coefficient by fitting the experimental data, the thermal diffusivity of the sample can be determined. The advantage of this method is that it is realized in a range of modulation requencies below those normally used, hence, the photoacoustic signal should be alone attributed to the mechanism of thermal diffusion. Moreover, the signal-to-noise ratio will be more reliable. This method was tested in some samples and it is also shown to be important in solids with high diffusivity values and thin materials. Research article of journal indexed in ISI database Instituto Politecnico Nacional and CONACYT-Mexico
URI :	http://www.repositoriodigital.ipn.mx/handle/123456789/10815
Otros identificadores :	0021-8979 http://hdl.handle.net/123456789/322
Aparece en las colecciones:	Doctorado

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Fichero	Descripción	Tamaño	Formato
1998 JAP v84 p6327.pdf		198.84 kB	Adobe PDF	Visualizar/Abrir

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