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Fundamentals of Sensors for Engineering and Science
book

Fundamentals of Sensors for Engineering and Science

by Patrick F. Dunn
April 2011
Intermediate to advanced content levelIntermediate to advanced
110 pages
3h 23m
English
CRC Press
Content preview from Fundamentals of Sensors for Engineering and Science
58 Fundamentals of Sensors for Engineering and Science
is the emissivity, and A
o
= 2π~c
2
o
and A
1
= ~c
o
/k
B
are constants equal to
374.15 MW µm
4
/m
2
and 14 388 µm K, respectively. The units of I
λ,T
are
W/(m
2
µm). Planck’s constant, ~, equals 6.6256×10
34
Js and Boltzmann’s
constant k
B
, equals 1.3805 × 10
23
J/K. When = 1, the body is termed
a blackbody or ideal radiator. When  < 1, the body is termed a non-ideal
radiator.
When a body is in thermal equilibrium with its surroundings, it emits the
same amount of energy that it absorbs. In this case, the amount of emitted
energy as compared with the total energy, which also includes reflected and
transmitted energies, is characterized by its emissivity. Surfaces such as
paper, brick, smooth glass, and water have
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Publisher Resources

ISBN: 9781439895252