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Method and arrangement for determining the concentration of a gas component in a gas mixture

  • US 20040000643A1
  • Filed: 06/28/2002
  • Published: 01/01/2004
  • Est. Priority Date: 06/28/2002
  • Status: Active Grant
First Claim
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1. A method for non-dispersive analysis of gas mixtures for determining the concentration of such a first gas component in a gas mixture, whose absorbance may be influenced by other gas components of said gas mixture, said method comprising the steps of:

  • (A) providing a radiation source emitting radiation over a wavelength range along a certain radiation path through the gas mixture;

    (B) providing to said radiation path an optical first bandpass filter having a first transmission band within an absorption band of said first gas component;

    (C) providing a first detector for detecting a first intensity of radiation passing along said radiation path and through said first bandpass filter, this first intensity producing a first measurement signal when the gas mixture in the radiation path is the gas mixture to be analyzed;

    (D) providing to said radiation path an optical second bandpass filter having a second transmission band;

    (E) providing a second detector for detecting a second intensity of radiation passing along said radiation path and through said second bandpass filter, this second intensity producing a second measurement signal when the gas mixture in the radiation path is the gas mixture to be analyzed;

    (F) determining a concentration value for the first gas component in the gas mixture to be analyzed using a predetermined formula or predetermined formulas, which take(s) as inputs at least said first measurement signal and said second measurement signal; and

    (G) selecting the second transmission band so that it is substantially or entirely outside the absorption bands of said first gas component and so that it comprises a second absorption band of a certain second gas component causing a distortion in the absorption band of said first gas component, the strength of the second absorption band being substantially less than the strength of the first absorption band.

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