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Proceedings Paper

Fast automotive diesel exhaust measurement using quantum cascade lasers
Author(s): J. Herbst; R. Brunner; A. Lambrecht
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Paper Abstract

Step by step, US and European legislations enforce the further reduction of atmospheric pollution caused by automotive exhaust emissions. This is pushing automotive development worldwide. Fuel efficient diesel engines with SCRtechnology can impede NO2-emission by reduction with NH3 down to the ppm range. To meet the very low emission limits of the Euro6 resp. US NLEV (National Low Emission Vehicle) regulations, automotive manufacturers have to optimize continuously all phases of engine operation and corresponding catalytic converters. Especially nonstationary operation holds a high potential for optimizing gasoline consumption and further reducing of pollutant emissions. Test equipment has to cope with demanding sensitivity and speed requirements. In the past Fraunhofer IPM has developed a fast emission analyzer called DEGAS (Dynamic Exhaust Gas Analyzer System), based on cryogenically cooled lead salt lasers. These systems have been used at Volkswagen AG‘s test benches for a decade. Recently, IPM has developed DEGAS-Next which is based on cw quantum cascade lasers and thermoelectrically cooled detectors. The system is capable to measure three gas components (i.e. NO, NO2, NH3) in two channels with a time resolution of 20 ms and 1 ppm detection limits. We shall present test data and a comparison with fast FTIR measurements.

Paper Details

Date Published: 31 January 2014
PDF: 7 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899322 (31 January 2014); doi: 10.1117/12.2038896
Show Author Affiliations
J. Herbst, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
R. Brunner, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
A. Lambrecht, Fraunhofer-Institut für Physikalische Messtechnik (Germany)


Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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