TIME-RESOLVED MEASUREMENT OF VEHICLE SULFATE AND METHANE EMISSIONS WITH TUNABLE DTODE LASERS

A new analytical method, absorption of tunable diode laser radiation, can detect small concentrations of gases with fast response. This technique has been applied to the detection of vehicle sulfate emissions in the form of sulfuric acid (H2SO4) vapor. Our laser system has a response time of 2.4 s. This allowed tracking the sulfate emissions of a vehicle during a Highway Fuel Economy Test. The data suggests that catalyst temperature is the major parameter controlling sulfate emissions and that storage and release of sulfur occurs at low and high catalyst temperatures, respectively. The same method detected methane during both the Highway Fuel Economy Test and the Federal Test Procedure. It identified the conditions, and corresponding concentrations, for high methane emissions.

Media Info

  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00315481
  • Record Type: Publication
  • Report/Paper Numbers: SAE 800510
  • Files: TRIS
  • Created Date: Nov 19 1980 12:00AM