Method of determining the concentration of a gas component and spectrometer therefor

摘要

The invention relates to a method and to a spectrometer for determining the concentration of a gas component, wherein a light source of the spectrometer is operated as in WMS and thus a determination of the concentration can also take place in accordance with WMS and the measured data can, however, additionally be processed, namely a sorting takes place on the time axis, such that the concentration can be determined using the methods of DAS.

主权项

1. A method of determining the concentration of a gas component, the method comprising the steps of:
producing a light beam having a wavelength variable in a wavelength range; guiding the light beam through a measurement volume in which the gas component to be determined is present, wherein the gas component has an absorption in the wavelength range; tuning the wavelength range, wherein an additional modulation of the wavelength takes place during the tuning at a modulation frequency which is high in comparison with a rate of the tuning so that a wavelength-to-time progression with a high-frequency modulation results, with the high frequency modulation having a phasing; detecting an intensity of the light beam after passing through the measurement volume; during the tuning, detecting measured points which contain an intensity value and which are each recorded at times which correspond to the same phasing of the high frequency modulation; producing an artificial measurement curve from the detected measured points; and evaluating the artificial measurement curve and determining a first concentration value therefrom.