Error analysis for different inversion techniques in low-resolution FTIR spectrometry and its application to the investigation of trace gas variations

Achim Sedlmaier; Ralf Sussmann; Klaus Schaefer

doi:10.1117/12.274746

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23 May 1997 Error analysis for different inversion techniques in low-resolution FTIR spectrometry and its application to the investigation of trace gas variations

Achim Sedlmaier, Ralf Sussmann, Klaus Schaefer

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Proceedings Volume 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods; (1997) https://doi.org/10.1117/12.274746
Event: Environmental Sensing III, 1997, Munich, Germany

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.

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Achim Sedlmaier, Ralf Sussmann, and Klaus Schaefer "Error analysis for different inversion techniques in low-resolution FTIR spectrometry and its application to the investigation of trace gas variations", Proc. SPIE 3107, Remote Sensing of Vegetation and Water, and Standardization of Remote Sensing Methods, (23 May 1997); https://doi.org/10.1117/12.274746

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