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Abstract

A sensor device and a method for non-dispersive analysis of gas mixtures for determining the concentration of one gas component contained therein, whose absorbency may be influenced as a result of collision broadening by other components contained in a gas mixture (GC). The device includes: a measuring chamber (5), containing the gas mixture; a radiation source (4), emitting radiation (15) through the chamber; detector (10, 14, 16) for receiving radiation passed through the chamber; optical bandpass filters (9a-c) positioned between the detectors and the radiation source, the detectors being coupled with measuring ducts (1-3) or measuring cycles. An optical gas filter (11), contains said gas component or a mixture thereof and is located between the detector and the radiation source. From the first measuring duct is obtained a first signal (S1) and from the second measuring duct is obtained a second signal (S2) relating to radiation also passed through the optical gas filter. Prior to analyses, the amount of a gas component in the gas filter is set at its pressure and/or absorption length or alternatively the effective amount of gas component in its gas mixture either at its fixed concentration and/or at the pressure and/or absorption length (L2) of the mixture to have such a value that: the second signal (S2) and the first signal (S1) are linearly independent of each other and that the second signal and the first signal have a mutual relationship, wherein the variable quantities include at least a collision broadening and a gas component concentration and wherein the coefficients are experimentally determined prior to analyses for accurately determining the effect of a collision broadening.

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