This report summarizes the results of initial tests of a remote sensing system capable of real time detection of particulate emissions from heavy duty transit vehicles under actual on-road operating conditions. The technique employs optical extinction (sometimes called opacity) to measure concentrations of carbon dioxide and soot in the exhaust plumes of individual vehicles. The primary goal of phase I was to ascertain whether or not the new technique held promise of sufficient sensitivity and accuracy for on-road deployment. Thus, laboratory calibration experiments were carried out to evaluate the sensor response. Measurements of carbon dioxide and soot concentrations were then made in a stationary exhaust plume taken directly from a laboratory engine. Qualitative agreement was obtained between the soot and carbon dioxide concentrations measured with the remote sensing technique and those measured with laboratory sampling instruments. Several sources of uncertainty were identified in the initial tests, and modifications are being made for phase II.

  • Supplemental Notes:
    • Research funded by the Regional Transit Board through the Center for Transportation Studies, University of Minnesota.
  • Corporate Authors:

    University of Minnesota, St Paul

    Center for Transportation Studies
    St Paul, MN  United States  55101
  • Authors:
    • Hofeldt, D L
    • Prochnau, T J
    • Chen, G
  • Publication Date: 1994-9-20


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 79 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00723580
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 24 1996 12:00AM