Definitions of different emissivities
Thermal Emissivity measurement

Article REF: R2747 V1

Definitions of different emissivities
Thermal Emissivity measurement

Authors : Jean-Pierre MONCHAU, Jacques HAMEURY

Publication date: June 10, 2018 | Lire en français

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1. Definitions of different emissivities

Material surfaces can exchange energy in the form of radiation. The amount of energy a surface can emit depends on its temperature and nature. Planck's law specifies the spectral luminance energy for a theoretical surface called a "black body":

L_{0} (λ, T) = \frac{2 \cdot h \cdot c^{2}}{λ^{5} \cdot (e^{\frac{h \cdot c}{λ \cdot k \cdot T}} - 1)}

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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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