Method and apparatus for remote measurement of exhaust gas

  • US 5,831,267 A
  • Filed: 02/24/1997
  • Issued: 11/03/1998
  • Est. Priority Date: 02/24/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for sensing a composition of an exhaust plume, comprising:

  • a light source that radiates an infrared light beam through said plume, said beam including a plurality of predetermined wavelengths;

    a detector that detects said beam passing through said plume at said predetermined wavelengths, wherein a first of said predetermined wavelengths is associated with carbon dioxide and a second of said predetermined wavelengths is associated with a second gas;

    means for computing a ratio of said second gas to carbon dioxide based upon said first and second detected wavelengths; and

    a multiplier that multiplies said ratio by a predetermined estimation of a concentration of carbon dioxide in said plume, to provide a measurement of a concentration of said second gas.

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