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Proceedings Paper

Multipath differential optical absorption spectroscopy system for urban pollution monitoring
Author(s): Hans Edner; Paer Ragnarsson; Sune Svanberg
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Paper Abstract

A fully computer-controlled differential optical absorption spectroscopy (DOAS) system for atmospheric air pollution monitoring is described. A receiving optical telescope can, via a large planar mirror controlled by stepping motors, sequentially tune in to light beams from a number of distant lamp light sources to cover the area. The light is directly coupled into a rapid scanning spectrometer from the computer-controlled secondary mirror in the Newtonian Telescope. The beam-finding servo system and automatic gain control allows long unattended measurements. Using an astronomical code, celestial sources can also be searched and tracked. By computer fitting to stored laboratory spectra the path-averaged concentration of a number of important pollutants such as NO2, SO2, and O3 can be evaluated. A measurement of NH3 and NO close to the UV-limit is also demonstrated. Evaluated data are stored together with meteorological data and other system parameters.

Paper Details

Date Published: 12 February 1993
PDF: 7 pages
Proc. SPIE 1715, Optical Methods in Atmospheric Chemistry, (12 February 1993); doi: 10.1117/12.140191
Show Author Affiliations
Hans Edner, Lund Institute of Technology (Sweden)
Paer Ragnarsson, Lund Institute of Technology (Sweden)
Sune Svanberg, Lund Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 1715:
Optical Methods in Atmospheric Chemistry
Harold I. Schiff; Ulrich Platt, Editor(s)

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