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Hagen, Gunter ; Werner, Robin ; Feulner, Markus ; Schubert, Michael ; Müller, Andreas ; Brüggemann, Dieter ; Moos, Ralf:
Soot Sensing : Modelling and Real Gas Test of a Capacitive Approach.
2016
Veranstaltung: The 16th International Meeting on Chemical Sensors, IMCS 2016
, 10th - 13th July 2016
, Jeju, Korea.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Poster
)
Abstract
On-board-diagnostics (OBD) of exhaust gas aftertreatment systems comprising particle filters requires highly sensitive soot sensors. We present a capacitive approach. For that purpose, we covered the planar interdigital Pt-electrodes of a resistive device by a thin but dense insulating alumina layer utilizing the novel aerosol-deposition method (ADM). Now, the capacitance – evaluated as the sensor signal – should change even before the whole region is covered by conductive soot because the electrical field distribution in the gap between the electrodes changes. We proved this theory by FEM-based simulations (COMSOL Multiphysics) as well as by real gas measurements.