Pulsed flying spot with the logarithmic parabolas method for the estimation of in-plane thermal diffusivity fields on heterogeneous and anisotropic materials

L Gaverina , J. Batsale (1) , A Sommier , Christophe Pradere (2)

1 TREFLE - Transferts, écoulements, fluides, énergétique
2 I2M - Institut de Mécanique et d'Ingénierie de Bordeaux

A novel thermal non-destructive technique based on a Pulsed Flying Spot is presented here by considering in-plane logarithmic processing of the relaxing temperature field around the heat source spot. Recent progress made in optical control, lasers, and infrared cameras permits the acquisition of 2D temperature fields and localized thermal excitation on a small area instead of the entire recorded image. This study focuses on a new method based on spatial logarithm analysis of a temperature field to analyse and measure different parameters, such as the in-plane thermal diffusivity and localization of the spot. In this paper, this method is presented and the first results of heterogeneous anisotropic materials are depicted. The in-plane thermal diffusivity is estimated with an error lower than 4%, and the initial location of the heating spot is determined. Published by AIP Publishing. [http://dx.

Domaines: Sciences de l'ingénieur [physics]

L Gaverina, J. Batsale, A Sommier, Christophe Pradere. Pulsed flying spot with the logarithmic parabolas method for the estimation of in-plane thermal diffusivity fields on heterogeneous and anisotropic materials. Journal of Applied Physics, 2017, 121 (11), pp.115105. ⟨10.1063/1.4978919⟩. ⟨hal-02369031⟩