| abstract |
An infrared optical gas analyzer is provided with at least one infrared optical radiation source ( 6, 7 ), two multispectral detectors ( 1, 2 ) and a cuvette ( 12 ) containing the gas mixture to be measured. A process for determining gas concentrations with the infrared optical gas analyzer is also provided. The gas analyzer makes possible the simultaneous measurement and identification of a plurality of gases in a gas mixture with a compact design not prone to interference. The radiation emitted by an infrared optical radiation source ( 6 ) covers a first wavelength range [λ 1 , λ 1′ ] and the radiation emitted by an infrared optical radiation source ( 7 ) covers a second wavelength range [λ 2 , λ 2′ ] which is selected such that it is different from the first wavelength range. The paths of rays pass through the interior of the cuvette ( 12 ) and reach the multispectral detectors ( 1 ) and ( 2 ). These pass on the signals received to an evaluating and control unit ( 13 ), which calculates the gas concentrations taking into account cross sensitivities during the measurement by the multispectral detectors ( 1 ) and ( 2 ). |