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Proceedings Paper

Using a Fourier transform spectrometer for tropospheric UV-visible DOAS measurements
Author(s): Michel R. Carleer; Reginald Colin; Ann Carine Vandaele
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Paper Abstract

Concentration measurements of trace gases in the atmosphere require the use of highly sensitive and precise techniques. The UV-visible DOAS technique is one of them heavily used for tropospheric measurements. In order to assess the advantages and drawbacks of using a Fourier transform spectrometer, we have built a DOAS optical setup based on a Bruker IFS 120M spectrometer. The characteristics and capabilities of this setup have been studied and compared to those of the more conventional grating based instruments during several intercomparison campaigns. The main advantages of the FTS are: (i) the existence of a reproducible and precise wavenumber scale, which greatly simplifies the algorithms used to analyze the atmospheric spectra; and (ii) the possibility to record large spectral regions at relatively high resolution, enabling the simultaneous detection of numerous chemical species with better discriminating properties. The main drawback, on the other hand, is due to the fact that an FTS records high frequency signals and does not have the signal integration capabilities of the CCD based grating spectrographs. The FTS therefore needs fairly large amounts of light and is limited to short to medium absorption pathlengths.

Paper Details

Date Published: 15 December 1998
PDF: 9 pages
Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332652
Show Author Affiliations
Michel R. Carleer, Univ. Libre de Bruxelles (Belgium)
Reginald Colin, Univ. Libre de Bruxelles (Belgium)
Ann Carine Vandaele, Institut d'Aeronomie Spatiale de Belgique (Belgium)

Published in SPIE Proceedings Vol. 3493:
Spectroscopic Atmospheric Environmental Monitoring Techniques
Klaus Schaefer, Editor(s)

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