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Proceedings Paper

Signal optimization, noise reduction, and systematic error compensation methods in long-path DOAS measurements
Author(s): Emilio Simeone; Alessandro Donati
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Paper Abstract

The increment of the exploitable optical path represents one of the most important efforts in the differential optical absorption spectroscopy (DOAS) instruments improvement. The methods that allow long path measurements in the UV region are presented and discussed in this paper. These methods have been experimented in the new Italian DOAS instrument - SPOT - developed and manufactured by Kayser Italia. The system was equipped with a tele-controlled optical shuttle on the light source unit, allowing background radiation measurement. Wavelength absolute calibration of spectra by means of a collimated UV beam from a mercury lamp integrated in the telescope has been exploited. Besides, possible thermal effects on the dispersion coefficients of the holographic grating have been automatically compensated by means of a general non-linear fit during the spectral analysis session. Measurements in bistatic configuration have been performed in urban areas at 1300 m and 2200 m in three spectral windows from 245 to 380 nm. Measurements with these features are expected in the other spectral windows on path lengths ranging from about 5 to 10 km in urban areas. The DOAS technique can be used in field for very fast measurements in the 245-275 nm spectral range, on path lengths up to about 2500 m.

Paper Details

Date Published: 15 December 1998
PDF: 9 pages
Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332645
Show Author Affiliations
Emilio Simeone, Kayser Italia S.r.l. (Italy)
Alessandro Donati, Kayser Italia S.r.l. (Italy)


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

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