Improved strategies for quantitative evaluation of atmospheric FTIR spectra obtained in open-path monitoring
✍ Scribed by Uwe Müller; H. Michael Heise; Herbert Mosebach; Andrea G. Gärtner; Thomas Häusler
- Publisher
- John Wiley and Sons
- Year
- 1999
- Weight
- 366 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1086-900X
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✦ Synopsis
Improvements in the quantitative evaluation of atmospheric Fourier-transform infrared (FTIR) spectra, obtained in environmental monitoring by using a bistatic spectrometer setup, are presented. Preprocessing of interferograms and spectral data was carried out to improve the photometric accuracy and wave-number scale reproducibility, necessary for reliable quantitative analysis. Univariate component analysis was optimized, and a refined strategy for multivariate analysis by least squares was set up. Special procedures were developed for the determination of benzene and of small molecules with resolved rotation-vibration fine structure. Results from field measurements, which were obtained by using the implemented subroutines for univariate and multivariate spectrum evaluation, are presented and discussed.