Abstract
A detailed study of the detection of trace gases at atmospheric pressure using tunable diode lasers is described. The influence of multipass cells, retroreflectors and topographical targets is examined. The minimum detectable infrared absorption ranges from 0.1% for a pathlength of 1.2 km to 0.01% over short pathlengths. The factors which limit this sensitivity are discussed, and the techniques are illustrated by monitoring atmospheric CO2 and CH4.
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