InfRec Thermo Gear G100, Operation Manual

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Chapter 7 Appendix
In radiation of normal object, as the emissivity is
ε
(<1) times of the blackbody, multiply above
equation by
ε
. Following Fig. 7.2 is spectral radiant emittance of a blackbody.
(a) is shown by logarithmic scale and (b) is shown by linear scale.
Spectral radiant emittance
Spectral radiant emittance
Fig. 7.2 Spectral radiant emittance of a blackbody
The graphs in Fig. 7.2 shows that wavelength and spectral radiant emittance vary with the
temperature.
Fig. 7.2 shows, as the temperature rises, the peak of spectral radiant emittance is shifting to
shorter wavelength side. This phenomenon is some in the visual light region, an object at low
temperature appears red, and as the temperature increases, it changes to yellowish and then
whitish color.
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