Apparatus for remote analysis of vehicle emissions

  • US 5,210,702 A
  • Filed: 12/26/1990
  • Issued: 05/11/1993
  • Est. Priority Date: 12/26/1990
  • Status: Expired due to Term
First Claim
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1. A gas analysis device for detecting and measuring levels of gases in the exhaust of moving motor vehicles in the ambient atmosphere selected from the group consisting of carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides and water vapor levels, said device comprising:

  • a. source means for producing collimated infrared and ultraviolet radiation and transmitting such radiation through a portion of said motor vehicle exhaust;

    b. means for splitting said infrared and ultra-violet radiation into separate infrared and ultraviolet beams;

    c. means for receiving said ultraviolet beam and generating a first electrical signal indicative of the absorption of ultraviolet radiation by nitrogen oxides in said exhaust;

    d. means for splitting said infrared beam into at least two separate infrared beam components;

    e. means for receiving a first infrared beam component and generating a second electrical signal indicative of the absorption of said infrared beam by carbon dioxide in said exhaust;

    f. means for receiving a second infrared beam component and generating at least a third electrical signal therefrom indicative of the absorption of said infrared beam by gases in said exhaust selected from the group consisting of carbon monoxide, hydrocarbons and water vapor; and

    g. means responsive to said electrical signals for computing and producing output signals indicative of the amount of gases selected from the group consisting of carbon monoxide, hydrocarbons and water in the path of said collimated infrared and ultraviolet radiation in said exhaust.

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