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The ICAD
This industrial device has a pump that sucks air. This air goes through filters and fills an optical cavity
where the quantity of nitrogen dioxide present in the air is measured. This measurement (given in
par per billion or ppbv) corresponds exactly to the ambient air that we are breathing. The instrument
is bound to a GPS captor in order to precisely record the location where measurements are taken.
The DOAS
This instrument was designed and realized at the institute. It is used to measure the quantity of
nitrogen dioxide present in the whole column of air above the bike. It has an optical captor that is
able to measure the concentration of the trace gases in the UV and spectral ranges. It therefore
requires a clear sky to work accurately.
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