2020
ACL
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Domingos De Sousa Meneses, Philippe Melin, Leire del Campo, Olivier Rozenbaum, Lionel Cosson, 'Probing high temperature thermal emissive properties of energy materials and coatings with emission spectroscopy augmented by in situ reflection', Infrared Phys. Technol. 108 103329 (2020) doi:10.1016/j.infrared.2020.103329
A robust non-contact methodology for the in situ determination of both the temperature and the spectral emissivity
of a surface spot is presented. It is applicable to all materials exhibiting an opacity region. Tests performed on
different materials demonstrated the high level of accuracy of the method when it is applied to the temperature
measurement of smooth surfaces. The accuracy is reduced when probing rough surfaces, but it was shown that
the relative uncertainty for temperature was still better than one percent for materials whose roughness characteristic
size is less than the wavelength used to perform the temperature determination. Analytical formulas
to derive upper limits of the combined standard uncertainties are presented. For rough surfaces, the association
with a microfacet model describing the light scattering by the sample surface provides a method to evaluate the
optimum spectral range for the determination of the temperature.
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