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

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 t...

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Autores principales: Hagen, Gunter, Spannbauer, Christoph, Feulner, Markus, Kita, Jaroslaw, Müller, Andreas, Moos, Ralf
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210793/
https://www.ncbi.nlm.nih.gov/pubmed/30347652
http://dx.doi.org/10.3390/s18103531
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author Hagen, Gunter
Spannbauer, Christoph
Feulner, Markus
Kita, Jaroslaw
Müller, Andreas
Moos, Ralf
author_facet Hagen, Gunter
Spannbauer, Christoph
Feulner, Markus
Kita, Jaroslaw
Müller, Andreas
Moos, Ralf
author_sort Hagen, Gunter
collection PubMed
description 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.
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spelling pubmed-62107932018-11-02 Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect Hagen, Gunter Spannbauer, Christoph Feulner, Markus Kita, Jaroslaw Müller, Andreas Moos, Ralf Sensors (Basel) Article 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. MDPI 2018-10-19 /pmc/articles/PMC6210793/ /pubmed/30347652 http://dx.doi.org/10.3390/s18103531 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hagen, Gunter
Spannbauer, Christoph
Feulner, Markus
Kita, Jaroslaw
Müller, Andreas
Moos, Ralf
Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect
title Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect
title_full Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect
title_fullStr Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect
title_full_unstemmed Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect
title_short Conductometric Soot Sensors: Internally Caused Thermophoresis as an Important Undesired Side Effect
title_sort conductometric soot sensors: internally caused thermophoresis as an important undesired side effect
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210793/
https://www.ncbi.nlm.nih.gov/pubmed/30347652
http://dx.doi.org/10.3390/s18103531
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