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Pulsed polarization of lambda probes – evaluation of the polarization current

Title data

Fischer, Sabine ; Pohle, Roland ; Magori, Erhard ; Farber, Boris ; Fleischer, Maximilian ; Moos, Ralf:
Pulsed polarization of lambda probes – evaluation of the polarization current.
2013
Event: Sensor 2013 , 14.-16.05.2013 , Nürnberg, Deutschland.
(Conference item: Conference , Other Presentation type)
DOI: https://doi.org/10.5162/sensor2013/P2.7

Official URL: Volltext

Abstract in another language

Conventional thimble type lambda sensors show strong response on NOx by evaluation of the open circuit discharge characteristics after defined polarizations with alternating signs. The sensor signal is dependent on oxygen or water concentration but the influence on discharge characteristics is consistent with Nernstian behavior. This confirms the feasibility of a pulsed mode operated lambda probe as a NOx sensor for exhaust gas measurements. To find the underlying mechanism of this polarization technique, the current during the voltage pulse is evaluated in a simulated combustion exhaust gas with varying oxygen and moisture levels. By increasing the oxygen or water content in the exhaust the polarization current decreases at both polarization directions. Platinum oxidation during voltage pulses is assumed to be responsible for this effect.

Further data

Item Type: Conference item (Other)
Refereed: Yes
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
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 30 Mar 2015 12:46
Last Modified: 14 Apr 2016 07:13
URI: https://eref.uni-bayreuth.de/id/eprint/9447