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LICOR LI-7500
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measure the vertical turbulent fluxes of CO2 and water vapor (H2O) was
used as an instrument of Licorice, Environmental Division, which uses
the absorption of infrared radiation by the gas to detect a measure of
concentration of the gas itself. Is
the model Li7500 is an open-path instrument or an instrument in which
the air sample is in direct contact with the atmosphere.
A problem common to many tools for open-path is the fact that the measures affected by the presence of rain, dew or snow. In
fact, a drop of rain that passes through the optical path of infrared
radiation, or condensation of water vapor on the optical windows,
causing a spike in the recorded signal, which is obviously an incorrect
value of the concentration of CO2 or H2O.
At
this point in limiting the problem should perform an angled instrument
and use of water repellent products to lubricate the optical windows
(Instruction Manual, Licor Li7500) so as to improve the slip of water,
or any snow, which would rest on surface.
The
Licor is mounted at an angle of about 60 ° from the horizontal bar and
was used a commercial repellent (Rain X ®) to treat the windows. |
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