Abstract

The “equiangular method” of monitoring the vertical column density of atmospheric pollution gas basing on scattered solar radiation is reported. The “equiangular method” could be classified as the multiaxis differential absorption optical spectroscopy (DOAS) technique, but its principle is more rigorous. The equiangular method is based on two assumptions, “horizontal homogeneity” and “single scattering” of atmosphere, which are proved to be acceptable to a great extent by actual measurements.

© 2009 Optical Society of America

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