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OPEN-PATH FTIR MEASUREMENTS OF NOX AND OTHER DIESEL EMISSIONS
Citation:
Kagann, R. H., R. A. Hashmonay, K. Wagoner, AND D B. Harris*. OPEN-PATH FTIR MEASUREMENTS OF NOX AND OTHER DIESEL EMISSIONS. Presented at A&WMA, Baltimore. MD, 6/23-27/02.
Description:
The paper gives results of a demonstration of the feasibility of using an open-path Fourier transform infrared (OP-FTIR) monitoring technique to address the across-road characterization of diesel vehicle emissions of criteria pollutants and hazardous air pollutants. Four sets of OP-FTIR measurements were made on diesel exhaust from a stationary class 8 tractor which was projected through the OP-FTIR measurement path. The OP-FTIR system was of a monostatic, coaxial, single-telescope design) and a pathlength of 7 m was used between the FTIR sensor and the corner-cube retroreflector, resulting in a total round-trip beam path of 14 m. In this diesel engine exhaust test, nitrogen oxides (NOx) were unexpectedly identified in all runs. In addition to NOx, concentrations of ethylene, carbon monoxide, carbon dioxide, formaldehyde, and alipahtic hydrocarbons were detected and measured. This is the first report of diesel engine emission measurements using OP-FTIR in an across-road configuration.