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Observation of electrochemical processes by the RF cavity perturbation method and associated inverse problem

Title data

Fischerauer, Gerhard ; Gollwitzer, Andreas ; Nerowski, Alexander ; Spörl, Matthias ; Moos, Ralf:
Observation of electrochemical processes by the RF cavity perturbation method and associated inverse problem.
In: Transactions on Systems, Signals, and Devices. Vol. 6 (January 2012) Issue 4 . - pp. 339-356.
ISSN 1861-5252

Project information

Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

Electrochemical reactions occuring at high temperatures and inside bulk materials are often observed indirectly. For instance, one commonly estimates the state of the three-way catalyst (TWC) in the exhaust pipe of a gasoline engine from the measured air-to-fuel ratios in the exhaust gases entering and leaving the catalyst. Our goal is to directly observe the catalyst state in situ by a non-contact RF approach. It is based on two facts: first, the reacting medium and its stainless steel canning form a filled cavity resonator at microwave frequencies; second, the medium changes its dielectric and conductive properties depending on its electrochemical state. Hence, the resonator is perturbed when the catalyst changes its conductivity as a function of oxygen loading. The estimation of the catalyst state involves the solution to the inverse problem, i. e., the inference of the catalyst material parameters from the measured RF parameters. We will first show that the characteristics of the RF resonator S-parameters indeed mirror the oxidation/reduction state of the catalyst and will then discuss possible approaches to the solution of the inverse problem.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISBN 978-3-8440-0679-7; Band-Hrsg.: Olfa Kanoun
Keywords: Electrochemistry; catalyst; automotive; in situ; state observation; RF; cavity
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Profile Fields
Profile Fields > Emerging Fields
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 16 Feb 2016 09:26
Last Modified: 16 Feb 2016 09:26
URI: https://eref.uni-bayreuth.de/id/eprint/30829