Mathematics – Logic
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1715..322e&link_type=abstract
Proc. SPIE Vol. 1715, p. 322-328, Optical Methods in Atmospheric Chemistry, Harold I. Schiff; Ulrich Platt; Eds.
Mathematics
Logic
Scientific paper
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.
Edner Hans
Ragnarsson Paer
Svanberg Sune
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