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On the inverse problem associated with the observation of electrochemical processes by the RF cavity perturbation method

Title data

Fischerauer, Gerhard ; Gollwitzer, Andreas ; Nerowski, Alexander ; Spörl, Matthias ; Moos, Ralf:
On the inverse problem associated with the observation of electrochemical processes by the RF cavity perturbation method.
2009
Event: 6th International Multi-Conf. on Systems, Signals & Devices : SSD ' 09 , 23.-26.03.2009 , Djerba, Tunesia.
(Conference item: Conference , Speech )
DOI: https://doi.org/10.1109/SSD.2009.4956751

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationFi 956/3-1 and Mo 1060/6-1

Project financing: Deutsche Forschungsgemeinschaft

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: Conference item (Speech)
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 27 Apr 2015 13:22
Last Modified: 11 Apr 2016 09:15
URI: https://eref.uni-bayreuth.de/id/eprint/11294