Pulsed cavity ring-down spectroscopy of NO and NO2 in the exhaust of a diesel engine |
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Authors: | R. Evertsen A. Staicu N. Dam A. van Vliet J.J. ter Meulen |
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Affiliation: | (1) Applied Physics, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands, NL;(2) National Institute for Laser Plasma and Radiation Physics, Laser Department, P.O. Box MG 36, Bucharest, Romania, RO |
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Abstract: | The application of pulsed cavity ring-down spectroscopy has been demonstrated for the in situ quantitative determination of NO and NO2 in the exhaust of a diesel engine. NO absorption has been monitored at the transition from the Χ2Π ground state to the A2Σ+ state at 226 nm. For NO2, absorption bands in the spectral region from 438 nm to 450 nm were used. At the selected engine conditions, concentrations of 212±22 ppm and 29±4 ppm have been measured for NO and NO2, respectively, in good agreement with separate chemical exhaust gas analysis. The method is sensitive enough to meet the European Euro V standard directive on NOx emissions. This communication discusses the relatively simple setup needed for this type of measurement, the problems encountered, as well as the prospects for single-stroke, simultaneous measurements of both NO and NO2 at the sub-ppm level. Received: 30 November 2001 / Revised version: 18 February 2002 / Published online: 14 March 2002 |
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Keywords: | PACS: 42.68.Ca 42.62.Fi 07.88.+y |
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