BRDF (Bidirectional Reflectivity Distribution Function) modelling for accuracy enhanced thermoreflectometry

Benjamin Javaudin (1) , Rémi Gilblas (1) , Thierry Sentenac (1) , Yannick Le Maoult (1)

1 ICA - Institut Clément Ader

In the field of thermography, the main problem of measuring the true temperature is the knowledge of the emissivity. Thermoreflectometry overcomes this problem by including an " in-situ " emissivity determination based on bidirectional reflectivity measurement. However, this method introduces an unknown diffusion function in order to link this measurement to the emissivity. The suggested modelling of this function is based on physical models of Bidirectional Reflectivity Distribution Function (BRDF). The model is then compared with the experimental BRDF of a platinum sample and the diffusion function is studied as a function of the roughness and for two geometrical configurations.

Domaines: Sciences de l'ingénieur [physics]

Benjamin Javaudin, Rémi Gilblas, Thierry Sentenac, Yannick Le Maoult. BRDF (Bidirectional Reflectivity Distribution Function) modelling for accuracy enhanced thermoreflectometry. QIRT 2018 - 14th Quantitative InfraRed Thermography Conference, QIRT, Jun 2018, Berlin, Germany. 9 p., ⟨10.21611/qirt.2018.123⟩. ⟨hal-01852327⟩