Mathematical determination of emissivity and surface temperature of aluminum alloys using multispectral radiation thermometry

A relatively simple emissivity model has recently been shown to effectively capture the parameteric effects of wavelength, temperature, alloy and surface roughness on the emissivity of aluminum surfaces. In the present study, a mathematical method is developed for determining both the empirical constant in the emissivity model and the surface temperature based on spectral radiance measurements. This study proves the relationship between reflectance ratio and optical roughness is by no means universal, and the complex effects of wavelength, temperature, alloy and surface roughness are more accurately captured with the aid of a multispectral emissivity model.