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Article | REF: R2747 V1

Thermal Emissivity measurement

Authors: Jean-Pierre MONCHAU, Jacques HAMEURY

Publication date: June 10, 2018

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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:

α(λ)+τ(λ)+ρ(λ)=1( 6 )

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...

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