temperature as that surface.

Spectral directional emissivity

Spectral directional emissivity in frequency and spectral directional emissivity in wavelength of a surface, denoted ?_?,? and ?_?,?, respectively, are defined as
:

where
* L_e,?,? is the spectral radiance in frequency of that surface;
* L_e,?,?° is the spectral radiance in frequency of a black body at the same temperature as that surface;
* L_e,?,?

1.Previous
3.Next