Apparatus for remote analysis of vehicle emissions

  • US 5,401,967 A
  • Filed: 06/03/1994
  • Issued: 03/28/1995
  • 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 and ultraviolet radiation through at least a portion of said motor vehicle exhaust; and

    a detector for receiving said beam having;

    (a) means for splitting said infrared and ultraviolet beam received from said source into separate infrared and ultraviolet beams;

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

    (c) spectrometer means for generating a signal indicative of the absorption of said ultraviolet beam by nitric oxide in said exhaust; and

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

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