Vaisala PTB210 SERIES Manuel d'instructions Page 21

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2.1.5 Solar Radiation - Kipp & Zonen CMP3
Function
Measurements with the BGC-FTIR-System are only possible when the sun is visible.
Therefore the Pyranometer CMP 3 comes into operation to determine if the local
conditions are favourable for measuremnts or not. Figure 2.9 shows the instrument.
Figure 2.9: Kipp & Zonen CMP3
[http://www.campbellsci.com/images/cmp3.jpg, 02.09.08]
The use of the CMP 3 is intended for shortwave global solar radiation measurements
(spectral range 310 to 2800 nm) and measures irradiance up to 2000 W/m
2
with a
response time less than 18 seconds.
Measuring Principle
The thermopile sensor construction measures the solar energy that is received from
the total solar spectrum and the hole hemisophere (180 degrees field of view). The
output is expressed in W/m
2
according to equation (2.2).
E
solar
=
U
emf
S
(2.2)
•E
solar
= Irradiance [W/m
2
]
•U
emf
= Output Voltage [V]
S = Sensitivity [V/(W/m
2
)]
In order to attain the proper directional and spectral characteristics, the pyranome-
ter‘s main components are fundamental as shown in Fig. 2.10 according to [13].
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