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Applied Optics

Applied Optics


  • Vol. 32, Iss. 3 — Jan. 20, 1993
  • pp: 327–333

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

Hans Edner, Pär Ragnarson, Stefan Spännare, and Sune Svanberg  »View Author Affiliations

Applied Optics, Vol. 32, Issue 3, pp. 327-333 (1993)

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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.

© 1993 Optical Society of America

Original Manuscript: June 18, 1991
Published: January 20, 1993

Hans Edner, Pär Ragnarson, Stefan Spännare, and Sune Svanberg, "Differential optical absorption spectroscopy (DOAS) system for urban atmospheric pollution monitoring," Appl. Opt. 32, 327-333 (1993)

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