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Proceedings Paper

Method for measuring thermal diffusivity on bulk samples
Author(s): Fereydoun Lakestani; Antonio Salerno; Alberto Volcan
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Paper Abstract

The measurement of thermal diffusivity on bulk samples has been previously performed using techniques which require a modulated point heating of the surface and a movement of the temperature detector or of the heating source to determine the phase shift of the modulated surface temperature at an increasing distance from the heating source. Such a movement must be realized with great accuracy and can be the cause of many experimental difficulties. The method proposed herewith is based on the fact that the modulated heating of a bulk sample on a surface spot gives a phase shift, between modulated temperature and heating source, which only depends on the ratio between the spot linear dimension and the thermal diffusion length. A frequency sweep produces a variation of the thermal diffusion length and a variation of the measured phase shift between 0° and -45°, thus allowing for a static single sided measurement of the thermal diffusivity of the sample.

Paper Details

Date Published: 12 April 2004
PDF: 9 pages
Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); doi: 10.1117/12.547682
Show Author Affiliations
Fereydoun Lakestani, Joint Research Ctr. (Italy)
Antonio Salerno, Politecnico di Milano (Italy)
Alberto Volcan, Joint Research Ctr. (Italy)

Published in SPIE Proceedings Vol. 5405:
Thermosense XXVI
Douglas D. Burleigh; K. Elliott Cramer; G. Raymond Peacock, Editor(s)

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