Multipath differential optical absorption spectroscopy system for urban pollution monitoring

Hans Edner; Paer Ragnarsson; Sune Svanberg

doi:10.1117/12.140191

12 February 1993 Multipath differential optical absorption spectroscopy system for urban pollution monitoring

Hans Edner, Paer Ragnarsson, Sune Svanberg

Proceedings Volume 1715, Optical Methods in Atmospheric Chemistry; (1993) https://doi.org/10.1117/12.140191
Event: Environmental Sensing '92, 1992, Berlin, Germany

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.

Citation Download Citation

Hans Edner, Paer Ragnarsson, and Sune Svanberg "Multipath differential optical absorption spectroscopy system for urban pollution monitoring", Proc. SPIE 1715, Optical Methods in Atmospheric Chemistry, (12 February 1993); https://doi.org/10.1117/12.140191

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