FLIR ThermaCAM E4 Operator's Manual page 88

17.3 – Blackbody radiation
For highly polished materials ε
approaches zero, so that for a perfectly reflecting
λ
material (i.e. a perfect mirror) we have:
For a graybody radiator, the Stefan-Boltzmann formula becomes:
This states that the total emissive power of a graybody is the same as a blackbody at
the same temperature reduced in proportion to the value of ε from the graybody.
10401203;1
Figure 17.8 Spectral radiant emittance of three types of radiators. 1: Spectral radiant emittance; 2:
Wavelength; 3: Blackbody; 4: Selective radiator; 5: Graybody.
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Publ. No. 1 558 017 Rev. a62 – ENGLISH (EN) – August 19, 2004