Abstract
Abstract Double-ended experimental arrangement using a small tunable TEA CO2 laser and a retroreflector was employed for differential absorption measurements of ethylene, freon 12 and ammonia concentrations in the atmospheric air in the distant sample chamber. Telescope collected return radiation was detected with a pyroelectric detector. Good agreement between remotely and in-situ measured concentrations was obtained. The system sensitivity to investigated gases was found to be of the order of several ppb-kilometers.
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