Development of a high-speed ultraviolet spectrometer for remote sensing of mobile source nitric oxide emissions

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Development of a high-speed ultraviolet spectrometer for remote sensing of mobile source nitric oxide emissions

Popp, P.J. / Bishop, G.A. / Stedman, D.H.

The DE (University of Denver) has developed a new remote sensor for the measurement of mobile NO (nitric oxide). The system is integrated with an existing infrared remote sensor and is capable of measuring carbon monoxide and hydrocarbons in addition to NO, at a rate of more than 1000 vehicles/hr. The detection limit on a low-emitting vehicle under typical measurement conditions is 24 parts per billion NO. Measurements from this instrument correlated well in a side-by-side comparison with the previous NO remote sensor developed at DU, and a suspected interference by aromatic hydrocarbons in the older instrument was confirmed. The results of an extended field experiment using the new instrument, constructed in fall 1997, are also presented. The NO emission of the fleet measured in the study (averaging 15.0 NO/gal) exhibit a skewed distribution typical of mobile sources. In addition, the relationships between NO emissions and model year and NO emissions and vehicle acceleration, as measured by the new remote sensor, are described.