Section 8
278
MikroScan 7600PRO
Operator’s Manual
Catalog 11180-94
V15.4F 050406
Principle of Thermal Imaging
This equation is called “Wien’s displacement law”.
Where in (1) to (3),
In radiation of a normal object, as the emissivity is (<1) times of the blackbody, multiply
above equation by the emissivity. The following figures show the spectral radiant emit
-
tance of a blackbody.
(a) s shown by logarthmc scale and (b) s shown by lnear scale.
The graphs show that wavelength and spectral radant emttance vary wth the tempera-
ture. They also show that as the temperature rises, the peak of spectral radiant emittance
s shftng to shorter wavelengths. Ths phenomenon s observable n the vsble lght
region as an object at a low temperature appears red, and as the temperature increases, it
changes to yellowsh and then whtsh color—thus shftng to shorter & shorter wave-
lengths as the temperature ncreases.
Spectral radiant emittance of a
blackbody
Summary of Contents for 7600PRO
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