Using a Fourier transform spectrometer for tropospheric UV-visible DOAS measurements

Michel R. Carleer; Reginald Colin; Ann Carine Vandaele

doi:10.1117/12.332652

15 December 1998 Using a Fourier transform spectrometer for tropospheric UV-visible DOAS measurements

Michel R. Carleer, Reginald Colin, Ann Carine Vandaele

Proceedings Volume 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques; (1998) https://doi.org/10.1117/12.332652
Event: Remote Sensing, 1998, Barcelona, Spain

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.

Citation Download Citation

Michel R. Carleer, Reginald Colin, and Ann Carine Vandaele "Using a Fourier transform spectrometer for tropospheric UV-visible DOAS measurements", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); https://doi.org/10.1117/12.332652

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