Calculating emissivity from the complex index
Thermal Emissivity measurement

Article REF: R2747 V1

Calculating emissivity from the complex index
Thermal Emissivity measurement

Authors : Jean-Pierre MONCHAU, Jacques HAMEURY

Publication date: June 10, 2018 | Lire en français

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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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Calculating emissivity from the complex index

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Bibliography

(1) - KAUDER (L.) - Spacecraft Thermal Control Coatings References. - NASA-TP-2005-212792 (2005).
(2) - P. LORRAIN, CORSON (D.R.) - Champs et ondes électromagnétiques. - s.l. : Armand Collin.

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