P5.7 - Simulation of a thermoelectric gas sensor to determine hydrocarbons in exhaust gases and to characterize catalyst materials

T. Ritter, S. Wiegärtner, G. Hagen & R. Moos
To determine the hydrocarbon (HC) concentration by an exhaust gas sensor, the thermoelectric sensing principle can be applied. A planar thermopile structure on a ceramic substrate enables measuring a temperature difference between a catalyst-coated and an inert area on the sensor. Exothermic reactions cause a temperature increase in the catalyst-coated area that can be measured as a voltage output of the thermopile. Temperature modulation of the overall sensor temperature allows for catalyst material characterization or...