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Conductometric Soot Sensors : Internally Caused Thermophoresis as an Important Undesired Side Effect

URN to cite this document: urn:nbn:de:bvb:703-epub-4260-6

Title data

Hagen, Gunter ; Spannbauer, Christoph ; Feulner, Markus ; Kita, Jaroslaw ; Müller, Andreas ; Moos, Ralf:
Conductometric Soot Sensors : Internally Caused Thermophoresis as an Important Undesired Side Effect.
In: Sensors. Vol. 18 (2018) Issue 10 . - No. 3531.
ISSN 1424-8220
DOI der Verlagsversion:

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Particulate matter sensors are of interest for application in the exhaust of any combustion processes, especially for automotive aftertreatment systems. Conductometric soot sensors have been serialized recently. They comprise planar interdigital electrodes (IDE) on an insulating substrate. Between the IDEs, a voltage is applied. Soot deposition is accelerated by the resulting electric field due to electrophoresis. With increasing soot deposition, the conductance between the IDE increases. The timely derivative of the conductance can serve as a sensor signal, being a function of the deposition rate. An increasing voltage between the IDE would be useful for detecting low particle exhausts. In the present study, the influence of the applied voltage and the sensor temperature on the soot deposition is investigated. It turned out that the maximum voltage is limited, since the soot film is heated by the resulting current. An internally caused thermophoresis that reduces the rate of soot deposition on the substrate follows. It reduces both the linearity of the response and the sensitivity. These findings may be helpful for the further development of conductometric soot sensors for automotive exhausts, probably also to determine real driving emissions of particulate matter.

Further data

Item Type: Article in a journal
Keywords: particulate matter sensors; exhaust gas aftertreatment; particulate filter; soot deposition; electrophoresis; thermophoresis; dynamometer
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Central research institutes > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Central research institutes
Research Institutions > Research Units
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-4260-6
Date Deposited: 04 Mar 2019 10:17
Last Modified: 10 Jul 2020 09:27


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