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Apparatus for remote analysis of vehicle emissions

  • US 5,319,199 A
  • Filed: 06/08/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 12/26/1990
  • Status: Expired due to Term
First Claim
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1. A gas analysis system for detecting and measuring relative concentrations of gases in the exhaust of a motor vehicle comprising:

  • a source for producing and transmitting a beam of infrared radiation through at least a portion of said motor vehicle exhaust; and

    a detector for receiving said infrared beam having;

    (a) a plurality of sensors, each sensor generating an electrical signal indicative of the absorption of said infrared beam in a wavelength band indicative of a corresponding one of the gases in said exhaust;

    (b) means for time-multiplexing said infrared beam to each of said sensors; and

    (c) means responsive to said electrical signals from said sensors for computing the relative concentrations of said gases in the path of said infrared beam through said exhaust.

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