Quantitative analysis of flue gas FTIR-spectra employing a new mathematical method to determine the instrumental line shape

Roman Windpassinger

doi:10.1117/12.332666

15 December 1998 Quantitative analysis of flue gas FTIR-spectra employing a new mathematical method to determine the instrumental line shape

Roman Windpassinger

Author Affiliations +

Proceedings Volume 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques; (1998) https://doi.org/10.1117/12.332666
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

Multivariate quantitative analysis of FTIR-spectra requires that the spectral line shapes of sample spectrum and spectral reference, and hence, the respective instrumental line shape (ILS) functions, match as closely as possible. In open-path measurements, the ILS' generally differ because of the differences in the optical geometry of the setups, or in the case of synthetic reference spectra, because the ILS cannot exactly be determined from the measuring parameter. In particular, when using large field stop diameters the line shapes can deviate considerably. Therefore, a mathematical method to approximate the ILS based on a parametrical identification has been developed and integrated into an algorithm for quantitative multivariate analysis. This article gives an overview over the parametrical model of the ILS approximation and its integration in the spectral evaluation algorithm, and presents results of their application to transmission spectra of extractive and open-path exhaust gas measurements.

Citation Download Citation

Roman Windpassinger "Quantitative analysis of flue gas FTIR-spectra employing a new mathematical method to determine the instrumental line shape", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); https://doi.org/10.1117/12.332666

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