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Abstract

A method of non-dispersive analysis of gas mixtures for determining the concentration of some gas component therein. A radiation source is arranged which emits, through the gas mixture being analyzed, radiation within a wavelength range within which the absorption spectrum band used in the determination of the concentration of the said gas component is located; an optical transmission band filter the transmission band of which coincides with the said spectrum band is provided in the path of the radiation traversing the gas mixture being analyzed; a detector is used for detecting the radiation which has traversed the gas mixture being analyzed and the optical transmission band filter, whereby a first signal is obtained from the detector; a different second signal is generated in the detector by means of an additional gas or an additional gas mixture interposed between the radiation source and the detector; and the result of the concentration measurement is formed computationally by using the different measurement signals. Furthermore, in the method the transmission bands of the said transmission band filters are arranged within the same measuring range; as the additional gas there is used a compensation gas or a compensation gas mixture in which the compensation gas is the gas component the concentration of which is being determined or a corresponding other gas or a compensation filter. The absorption properties of the compensation filter are selected to be such, or the amount of the compensation gas is selected to be such, that the broadening of the absorption lines in the absorption spectrum band used will change the said different second signal.

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