2. Calculating emissivity from the complex index
The relationship (6), based on the principle of conservation of energy, links the transmission factor, reflection factor and absorption factor for a given wavelength:
where α is the spectral absorption factor, τ the spectral hemispherical directional transmission factor and ρ the spectral hemispherical directional reflection factor.
For an opaque material, Kirchhoff's law states that the spectral directional absorption factor is...
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Calculating emissivity from the complex index
Emissivity of real materials
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