Demonstrator for online measurement of combustion gases NO, NO2 and SO2: A compact sensor system for highly resolved detection of hazardous emission gases

摘要

A cost effective and compact sensor system is described that provides an online measurement of combustion gases. Based on UV-VIS-absorption spectroscopy the most important hazardous emission gases nitrogen oxide (NO), nitrogen dioxide (NO₂) and sulfur dioxide (SO₂) are measured individually and quasi simultaneous with high temporal resolution. A demonstrator device was set up that utilizes only one measurement chamber so the detection of all gases takes place in the same measurement volume. The demonstrator shows a wide concentration dynamic range of some 1000 ppm and a resolution of below 1 ppm for all three gases. Such a sensor system can be used for online emission monitoring of combustion engines in transportation area as well as in stationary industry application. Especially because of the selective detection of the critical emission gas components NO and NO₂ the system can also be used for a well-directed engine and after treatment system control to optimize the catalyzers reactions to efficiently reduce harmful emissions of combustion engines.