Remote sensing of NO and NO2 emissions from heavy-duty diesel trucks using tunable diode lasers

David D. Nelson Jr.; Jose L. Jimenez; Gregory J. McRae; Mark S. Zahniser; Charles E. Kolb

doi:10.1117/12.366452

25 October 1999 Remote sensing of NO and NO₂ emissions from heavy-duty diesel trucks using tunable diode lasers

David D. Nelson Jr., Jose L. Jimenez, Gregory J. McRae, Mark S. Zahniser, Charles E. Kolb

Proceedings Volume 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II; (1999) https://doi.org/10.1117/12.366452
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

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 NO_x emission inventory. These emissions are underestimated by a factor of 2.2 in the latest EPA inventory.

Citation Download Citation

David D. Nelson Jr., Jose L. Jimenez, Gregory J. McRae, Mark S. Zahniser, and Charles E. Kolb "Remote sensing of NO and NO₂ emissions from heavy-duty diesel trucks using tunable diode lasers", Proc. SPIE 3758, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring II, (25 October 1999); https://doi.org/10.1117/12.366452

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