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Application of diode laser spectroscopy to quality control of industrial gas mixtures

: Mücke, R.; Werle, P.; Brenner, K.

VDI/VDE-Gesellschaft Meß- und Automatisierungstechnik -GMA-, Düsseldorf:
5th International Symposium on Gas Analysis by Tunable Diode Lasers 1998
Düsseldorf: VDI-Verlag, 1998 (VDI-Berichte 1366)
ISBN: 3-18-091366-5
S.191-200 : Ill., Lit.
International Symposium on Gas Analysis by Tunable Diode Lasers <5, 1998, Freiburg/Brsg.>
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

High-frequency modulation absorption spectroscopy using tunable diode lasers in the mid-infrared spectral region was applied to control the quality of some selected pressurized gas mixtures of industrial origin. The spectrometer was calibrated according to ISO regulations. The measurements on an industrial NO2 calibration gas mixture delivered NO2 concentrations in good agreement to the specified value 260 ppbv ¤ 5 per cent. In all, except one, commercial 20 ppmv NO calibration gas mixtures tested the NO2 contamination was below the detection limit of 0.2 ppbv. The measurements demonstrate the high performance of the FM-TDLAS technique used, and the high quality of the commercially available NO and NO2 calibration gas mixtures, pointing out the importance of applying proper tubing, gas withdrawal and conditioning techniques in analytical gas phase measurements, too.