D4.2 - Intergrating NOx Gas Sensor: Concept, Sensitivity to NO/NO2 and Benefits of the Integrating Sensing Principle

A. Geupel, R. Moos, D. J. Kubinski & J. H. Visser
On-Board-Diagnostics and emission regulations demand highly sensitive sensors for the detection of very low levels of NOx. For this purpose, the idea of an integrating NOx-sensor was developed. Via a lean NOx trap (LNT) NOx-molecules are accumulated in the sensitive layer and the total amount of NOx instead of the actual NOxconcentration, cNOx, is measured, promising an improved accuracy in the measurement of the accumulated NOx levels which is especially helpful for low ppm level...