Electrophoretic and thermophoretic effects on conductometric soot sensing : special challenges when using synthetic soot

Titelangaben

Hagen, Gunter ; Spannbauer, Christoph ; Moos, Ralf:
Electrophoretic and thermophoretic effects on conductometric soot sensing : special challenges when using synthetic soot.
In: 17th International Meeting on Chemical Sensors - IMCS 2018. - Wien , 2018 . - S. 639-640
ISBN 978-3-9816876-9-9
DOI: https://doi.org/10.5162/IMCS2018/P1SM.1

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Abstract

Recently, particulate filters became an inevitable part not only in Diesel but even also in exhaust gas aftertreatment systems of gasoline driven engines. As the soot particles are significantly smaller in that case, for monitoring purposes or on-board-diagnostics improved soot sensors concerning sensitivity and response time are needed. Development of such devices could be supported by the use of soot generators in the lab. The present contribution tries to transfer findings in real Diesel exhaust to the behavior of conductometric soot sensors under test in synthetic soot atmosphere. The influence of applied voltage and sensor temperature on the electrophoretic and thermophoretic soot deposition was reproduced but could not be easily measured by the current signal because synthetic soot shows complex conductivity properties.