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Proceedings Paper

Remote sensing of NO and NO2 emissions from heavy-duty diesel trucks using tunable diode lasers
Author(s): David D. Nelson; Jose L. Jimenez; Gregory J. McRae; Mark S. Zahniser; Charles E. Kolb
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Paper Abstract

On-road remote sensors can measure the emissions of motor vehicles under real-world conditions. The most sensitive and versatile remote sensor reported to date is based on Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS). This study applied this TILDAS remote sensor to the measurement of the emissions from heavy-duty diesel trucks (HDDTs). The remote sensor could operate with an optical pathlength of 88 m, or more than 5 times that of competing instruments. Remote sensing of NO2 emissions was demonstrated for the first time. Good agreement was obtained when comparing the TILDAS measurements with the on- board measurements of an instrumented HDDT. The distribution of NO emissions from HDDT was found not to be skewed. HDDTs are estimated to contribute about 3/5 of the on-road NOx emission inventory. These emissions are underestimated by a factor of 2.2 in the latest EPA inventory.

Paper Details

Date Published: 25 October 1999
PDF: 11 pages
Proc. SPIE 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II, (25 October 1999); doi: 10.1117/12.366452
Show Author Affiliations
David D. Nelson, Aerodyne Research, Inc. (United States)
Jose L. Jimenez, Aerodyne Research, Inc. (United States)
Gregory J. McRae, Massachusetts Institute of Technology (United States)
Mark S. Zahniser, Aerodyne Research, Inc. (United States)
Charles E. Kolb, Aerodyne Research, Inc. (United States)


Published in SPIE Proceedings Vol. 3758:
Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II
Alan Fried, Editor(s)

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