Capacitive Soot Sensor

Titelangaben

Hagen, Gunter ; Riess, Gerald ; Schubert, Michael ; Feulner, Markus ; Müller, Andreas ; Brüggemann, Dieter ; Moos, Ralf:
Capacitive Soot Sensor.
In: Procedia Engineering. Bd. 120 (2015) . - S. 241-244.
ISSN 1877-7058
DOI: https://doi.org/10.1016/j.proeng.2015.08.590

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Abstract

A capacitive soot sensor was built up on basis of a known resistive device by covering the electrode area with a thin but dense alumina layer manufactured by the aerosol-deposition-method (ADM). Deposited soot cannot short-circuit the electrodes but leads to an increasing capacitance of the sensor. Experiments were conducted in real exhaust. Increasing soot concentrations lead to a more fast and sharp increase of the capacitance and the blind time of the sensor decreased to almost zero. The performance of such sensors could be enhanced when a voltage is applied at the electrodes during soot collection.