Calibration and quality assurance of a high-resolution FTIR spectrometer for pollutant and greenhouse atmospheric trace gases

Georg Depta; Sabine C. Becher; Andreas Gronauer; Herbert W. Mosebach

doi:10.1117/12.274703

22 May 1997 Calibration and quality assurance of a high-resolution FTIR spectrometer for pollutant and greenhouse atmospheric trace gases

Georg Depta, Sabine C. Becher, Andreas Gronauer, Herbert W. Mosebach

Author Affiliations +

Proceedings Volume 3106, Spectroscopic Atmospheric Monitoring Techniques; (1997) https://doi.org/10.1117/12.274703
Event: Environmental Sensing III, 1997, Munich, Germany

Abstract

Fourier transform IR spectroscopy (FTIR) is well suited for establishing emission rates from sources of for example CH₄, N₂O, CO₂ as important greenhouse gases and for NH₃ as a pollutant causing severe damages to natural ecosystems. Since the gases mentioned above have spectral liens broadened to 0.2 cm^-1, the resolution used for these measurements is 0.2 cm^-1 too on a mobile instrument allowing resolutions up to 0.06 cm^-1. In a first attempt, calibration spectra were taken from HITRAN92 based FASCODE calculations. Since test measurements revealed problems in determining accurate concentrations, own spectra were taken at a dynamic gas-mixing station. The absorption coefficients differ strongly from the simulations, for example for CH₄ deviations are 19 percent max., for N₂O 16 percent for NH₃ 15 percent. Calibration showed good linearity of absorbance vs. concentration up to absorbencies of 0.4 at the resolution of 0.2 cm^-1.

Citation Download Citation

Georg Depta, Sabine C. Becher, Andreas Gronauer, and Herbert W. Mosebach "Calibration and quality assurance of a high-resolution FTIR spectrometer for pollutant and greenhouse atmospheric trace gases", Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); https://doi.org/10.1117/12.274703

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