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System and method for remote analysis of small engine vehicle emissions

  • US 20020010554A1
  • Filed: 12/21/2000
  • Published: 01/24/2002
  • Est. Priority Date: 12/29/1999
  • Status: Active Grant
First Claim
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1. A system for detecting components of the exhaust of a moving vehicle comprising:

  • a radiation source for producing radiation;

    a detector for receiving said radiation and generating at least one signal responsive to said radiation indicative of the radiation absorption of first and second vehicle exhaust components in first and second wavelength bands;

    optics for guiding said radiation through more than two passes through a detection space from said source to said detector, whereby said radiation passes through the exhaust plume of a moving vehicle in said detection space, and a processor responsive to the at least one signal, said processor calculating a ratio of the radiation absorption of the first vehicle exhaust component to the radiation absorption of the second vehicle exhaust component to compensate for at least some dispersion of the exhaust plume.

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