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Real-Time Measurement of Nitrogen Oxides in Vehicle Exhaust Gas by Mid-Infrared Cavity Ring-Down Spectroscopy
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
We developed cavity ring-down spectroscopy (CRDS)-based NO and NO₂ sensors using a pulsed quantum cascade laser (QCL) as a light source. The measurement of NO and NO₂ was demonstrated in the exhaust gas from two types of diesel engine vehicle equipped with different aftertreatment devices. In combinational use of a particle filter and a membrane gas dryer, interference effects from water and particulates in the exhaust gas were negligible. Stable and sensitive measurement of NO and NO₂ in exhaust gas was achieved for more than 30 minutes with a time resolution of 1 s.