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Method of measuring a chemical vapor concentration

  • US 8,642,345 B2
  • Filed: 03/05/2013
  • Issued: 02/04/2014
  • Est. Priority Date: 01/12/2005
  • Status: Active Grant
First Claim
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1. A method of measuring a chemical vapor concentration comprising:

  • providing a chemical vapor passive sensor that includes an infrared source and an infrared detector configured to detect infrared light in an infrared absorption cell;

    passing air, including sample vapor, through an adsorber;

    measuring a first output (designated Voff) of an infrared detector, with the infrared source deactivated;

    heating the adsorber;

    measuring a second output (designated Von) of the infrared detector, with the infrared source activated;

    passing concentrated sample vapor from the adsorber into and through the infrared absorption cell;

    measuring a change in an third output (designated Vsig) of the infrared detector;

    calculating a ratio Vsig/(Von−

    Voff); and

    measuring the chemical vapor concentration based on the ratio.

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