Increasing surface roughness increases spectral emissivity independent of wavelength.
Normal LWIR apparent emissivity is connected to the spectral emissivity of an aluminum nitride ceramic plate.
To verify our modification, we compared total emissivities obtained by calculated spectral emissivities with those obtained by measured spectral emissivity for several literature.
The α/ε ratios calculated from the spectral emissivity measurements are correlated to the ones obtained from integrated emissivity measurements.
Established equations are generalization of sensitivity analysis of high temperature spectral emissivity measurement method and can be used for computation of spectral emissivity total uncertainty.
The spectral emissivity was evaluated from the reflectance in IR region.
This is due to the selected set of illuminants that shows very different behaviors in term of spectral emissivity.
For nonisothermal flames the spectral emissivity was shown to be nearly independent of the wavelength.
Novel approximate relationships are proposed for the spectral emissivity of dusty media.
Spectral emissivity and cyclic oxidation were performed up to 973 K for the coatings.
