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
Original Manuscript: November 5, 2008
Revised Manuscript: June 5, 2009
Manuscript Accepted: June 14, 2009
Published: July 29, 2009
Haoyi Zuo, Qiaojun Liu, Jieyu Wang, and Shirong Luo, "Equiangular method: a technique of multiaxis DOAS," J. Opt. Soc. Am. B 26, 1656-1662 (2009)