Fast automotive diesel exhaust measurement using quantum cascade lasers

J. Herbst; R. Brunner; A. Lambrecht

doi:10.1117/12.2038896

31 January 2014 Fast automotive diesel exhaust measurement using quantum cascade lasers

J. Herbst, R. Brunner, A. Lambrecht

Proceedings Volume 8993, Quantum Sensing and Nanophotonic Devices XI; 899322 (2014) https://doi.org/10.1117/12.2038896
Event: SPIE OPTO, 2014, San Francisco, California, United States

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.

Citation Download Citation

J. Herbst, R. Brunner, and A. Lambrecht "Fast automotive diesel exhaust measurement using quantum cascade lasers", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899322 (31 January 2014); https://doi.org/10.1117/12.2038896

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