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Optics for Engineers
book

Optics for Engineers

by Charles A. DiMarzio
August 2011
Intermediate to advanced content levelIntermediate to advanced
564 pages
20h 45m
English
CRC Press
Content preview from Optics for Engineers
396 OPTICS FOR ENGINEERS
cavity at some temperature is
¯
E(T)
incident
, and the amount absorbed is
a
¯
E(T)
incident
(the rest
being reected), the radiant exitance must be the same:
¯
M(T)
emitted
=
a
¯
E(T)
incident
. (12.73)
Otherwise, the wall would change its temperature. In this equation,
a
is the absorption coef-
cient. The rest of the light is reected either specularly or diffusely, and the total reectance
is 1
a
. We state that “the absorption is equal to the emission,” and refer to this statement as
the principle of detailed balance.
Third, detailed balance must be true wavelength-by-wavelength. If it were not, we could
use a clever arrangement of ...
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Publisher Resources

ISBN: 9781439807255