Section 2
2-6
Theory of Operation
Equation Summary
H
2
O
In the atmosphere, the absorption of radiation by water vapor is not significantly influenced
by any other gas, so the effective pressure for water vapor P
ew
is simply the total pressure P.
P
ew
= P
2-11
H
2
O absorptance
α
w
is (from Equations 2-8 and 2-10)
α
w
w
wo
cw
c
co
wo
w
d
A
A
X
A
A
Z
Z V
= −
+
−
+
(
)
1
1
2-12
where X
cw
is the cross sensitivity factor for CO
2
on water vapor ("H
2
O XS" on the calibration
sheet), Z
w
is the zero drift coefficient ("H
2
O Z" on the calibration sheet).
H
2
O number density
ρ
w
is given by
ρ
α
w
w
w
w
Pf
S
P
=
2-13
The coefficients for the 3rd order polynomial f
w
( ) are given on the calibration sheet.
Содержание LI-7500
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Страница 41: ...Section 3 3 12 Setup and Operation...
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Страница 50: ...Section 3 Setup and Operation 3 21 Inputs Page Temperature Pressure and Auxiliary Inputs...
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