Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring

We describe a fully computer-controlled differential optical absorption spectroscopy system for atmospheric air pollution monitoring. A receiving optical telescope can sequentially tune in to light beams from a number of distant high-pressure Xe lamp light sources to cover the area of a medium-sized...

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Published in:Applied optics (2004) 1993-01, Vol.32 (3), p.327-333
Main Authors: Edner, H, Ragnarson, P, Spännare, S, Svanberg, S
Format: Article
Language:English
Subjects:
Atom and Molecular Physics and Optics
Atom- och molekylfysik och optik
Fysik
Natural Sciences
Naturvetenskap
Physical Sciences
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container_title Applied optics (2004)
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creator Edner, H
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Spännare, S
Svanberg, S
description We describe a fully computer-controlled differential optical absorption spectroscopy system for atmospheric air pollution monitoring. A receiving optical telescope can sequentially tune in to light beams from a number of distant high-pressure Xe lamp light sources to cover the area of a medium-sized city. A beam-finding servosystem and automatic gain control permit unattended long-time monitoring. Using an astronomical code, we can also search and track celestial sources. Selected wavelength regions are rapidly and repetitively swept by a monochromator to sensitively record the atmospheric absorption spectrum while avoiding the detrimental effects of atmospheric turbulence. By computer fitting to stored laboratory spectra, we can evaluate the path-averaged concentration of a number of important pollutants such as NO(2), SO(2), and O(3). A measurement of NH(3) and NO close to the UV limit is also demonstrated.
doi_str_mv 10.1364/ao.32.000327
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subjects Atom and Molecular Physics and Optics
Atom- och molekylfysik och optik
Fysik
Natural Sciences
Naturvetenskap
Physical Sciences
title Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring
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