Article Dans Une Revue International Journal of Thermophysics Année : 2003

Measurement of the Thermal Diffusivity of Solids with an Improved Accuracy

Résumé

A photothermal radiometry technique is being developed at the NPL with the goal of improving the accuracy of thermal diffusivity measurements. The principle is to perform a laser-induced thermal experiment while simultaneously making accurate measurements of the experimental boundary conditions. A numerical three-dimensional heat diffusion model based on thermal transfer functions has been developed to account for the measured boundary conditions. The thermal diffusivity is determined from the experimental data by a nonlinear, least-squares fit to the model. Experiments carried out on pure metals at 900 K demonstrate good agreement between the theoretical predictions and experimental data, and uncertainties of about 1.5% for the thermal diffusivities of platinum, titanium, and germanium were obtained.

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Christophe D Martinsons, A P Levick, Gordon J Edwards. Measurement of the Thermal Diffusivity of Solids with an Improved Accuracy. International Journal of Thermophysics, 2003, 24, pp.1171 - 1183. ⟨10.1023/a:1025073506015⟩. ⟨hal-04674807⟩
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