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Proceedings Paper

Error analysis for different inversion techniques in low-resolution FTIR spectrometry and its application to the investigation of trace gas variations
Author(s): Achim Sedlmaier; Ralf Sussmann; Klaus Schaefer
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Paper Abstract

As one part of a quality assurance in low-resolution FTIR spectrometry, the precision of a multicomponent monitoring system is studied. The instrumentation is composed of a commercial MIDAC M-2400-C FTIR spectrometer with a maximum optical path difference of 2 cm, a 22 m White cell, and a drier. Due to the difficulty to calibrate open-path measurements, a line-by-line calculation software, commonly used for high spectral resolution solar absorption spectrometry, was employed for the low-resolution horizontal-path measurements. Reference spectra of calibration gases recorded in the White cell are evaluated by both a partial-least-squares fitting method and the line- by-line analysis. Sources for the errors and their values differ in both methods. It is shown that the use of a line- by-line calculation software does not limit the efficiency but enhances the precision of the concentration analysis. Finally, the line-by-line evaluation yields relative errors between one and three percent for the gases CO2, CH4, N2O, and CO.

Paper Details

Date Published: 23 May 1997
PDF: 11 pages
Proc. SPIE 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods, (23 May 1997); doi: 10.1117/12.274746
Show Author Affiliations
Achim Sedlmaier, Fraunhofer-Institute for Atmospheric Environmental Research (Germany)
Ralf Sussmann, Fraunhofer-Institute for Atmospheric Environmental Research (Germany)
Klaus Schaefer, Fraunhofer-Institute for Atmospheric Environmental Research (Germany)


Published in SPIE Proceedings Vol. 3107:
Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods
Giovanna Cecchi; Torsten Lamp; Rainer Reuter; Konradin Weber, Editor(s)

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