Vaisala PTB210 SERIES Manuel d'instructions Page 22

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The most important components are the thermopile sensor with a black coating,
which absorbs all solar radiation, has a flat spectrum covering the 300 to 50000
nanometer range and has a near-perfect cosine response as well as the glass dome.
This dome limits the spectral response from 310 to 2800 nanometers (cutting off
the part above 2800 nm) while preserving the 180 degrees field of view. Another
function of the dome is the shielding of the thermopile sensor from convection and
other adverse environmental conditions.
Figure 2.10: Main Components
[http://en.wikipedia.org/wikiImage:
Pyranometer_sr11_hukseflux_crosssection.gif, 24.09.08]
The black coating on the thermopile sensor absorbs the solar radiation. This radi-
ation is converted to heat. The heat flows through the sensor to the pyranometer
housing. The thermopile sensor generates a voltage output signal that is propor-
tional to the solar radiation.
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