Physics – Optics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apopt..32..327e&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 32, no. 3, p. 327-333.
Physics
Optics
31
Absorption Spectroscopy, Air Pollution, Pollution Monitoring, Remote Sensing, Cities, Numerical Control, Pulsed Lasers
Scientific paper
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 NO2, SO2, and O3. A measurement of NH3 and NO close to the UV limit is also demonstrated.
Edner Hans
Ragnarson Par
Spannare Stefan
Svanberg Sune
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