Method for measuring thermal diffusivity on bulk samples

Fereydoun Lakestani; Antonio Salerno; Alberto Volcan

doi:10.1117/12.547682

12 April 2004 Method for measuring thermal diffusivity on bulk samples

Fereydoun Lakestani, Antonio Salerno, Alberto Volcan

Proceedings Volume 5405, Thermosense XXVI; (2004) https://doi.org/10.1117/12.547682
Event: Defense and Security, 2004, Orlando, Florida, United States

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.

Citation Download Citation

Fereydoun Lakestani, Antonio Salerno, and Alberto Volcan "Method for measuring thermal diffusivity on bulk samples", Proc. SPIE 5405, Thermosense XXVI, (12 April 2004); https://doi.org/10.1117/12.547682

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