Abstract

Tropospheric pressure and temperature could be deduced from the measurement of the molecular oxygen optical thickness in the A band centered at 762 nm. A detailed study of the accuracies of these measurements is presented, taking into account the nonmonochromaticity of the laser emission, the experimental uncertainties, and the atmospheric perturbations which lead to uncertainties in the mathematical derivation. Relative accuracies of 0.2% on the pressure and 0.4% on the temperature could be obtained using operational lidar systems. The vertical range is from 2 km to 3 km with a spatial resolution of 100 m and an integration time of the order of 1 min. It will be shown that the assumption of the monochromaticity of the laser emission requires the spectral width and the accuracy on the absolute frequency of the laser line to be both less than a few tenths of a gigahertz.

© 1980 Optical Society of America

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