Setup to eliminate the gas flow dependency of a hydrocarbon sensor for automotive exhaust applications

Titelangaben

Hagen, Gunter ; Harsch, Antonia ; Moos, Ralf:
Setup to eliminate the gas flow dependency of a hydrocarbon sensor for automotive exhaust applications.
2017
Veranstaltung: Sensor 2017 : 18th International Conference on Sensors and Measurement Technology , 30.05.-01.06.2017 , Nürnberg, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )
DOI: https://doi.org/10.5162/sensor2017/A4.1

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Abstract

Recently, a thermoelectric hydrocarbon sensor was developed for application in exhaust gas atmospheres by using materials which are well-known in the exhaust and stable against poisoning or ageing and at high temperatures. The temperature difference, which is generated between a catalytic activated area during exothermic oxidation of hydrocarbons and an inert area of the sensor, is measured by a special screen-printed thermopile structure. As a matter of principle, this thermovoltage significantly depends on the mass flow of the exhaust. The present contribution helps to understand this cross-effect and proposes a possible setup for its avoidance. By installing the sensor in the correct position of a bypass-solution, the gas flow around the sensor is mostly free of turbulences. Now, the signal depends only on the hydrocarbon concentration and not on the gas flow.