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Pulsed Polarization of YSZ-Sensors for Gas Detection

Title data

Fischer, Sabine ; Pohle, Roland ; Farber, Boris ; Fleischer, Maximilian ; Moos, Ralf:
Pulsed Polarization of YSZ-Sensors for Gas Detection.
2011
Event: 9th Asian Conference on Chemical Sensors , 14.-17.11.2011 , Taipei, Taiwan.
(Conference item: Conference , Other Presentation type)

Abstract in another language

BACKGROUND
Pulsed polarization as a new measurement technique for YSZ based gas sensors is presented to increase the differentiation between single exhaust gas components.
METHODS
The self-discharge voltage of the sensor is measured after pulsed polarization of the electrodes. After applying voltages in the range of 2.0 to 2.5 V and recording the discharging current, this pulse sequence is repeated with electrode polarizations of opposite signs. This pulse technique is used permanently and the discharge curves are measured continuously.
RESULTS
Already in the lower ppm-range, the discharge characteristics show strong dependencies to single exhaust gas components, especially to NOx. Compared to the mixed potential signals, the sensitivities by use of pulse technique are by far greater. Furthermore, individual discharge curves for all investigated gases can be distinguished. Depending on the sensor design, the discharge curves after alternating polarization differ from each other or are similar. Thimble type lambda probes, for example, show very high sensitivities to NOx at one polarization direction, whereas after alternating pulses the signal to ethanol is most prominent. This effect results from the asymmetric sensor design with different layers at inner and outer electrodes and additional reference atmospheres. Consequently, other reactions at the electrodes occur or time constants are dissimilar. This influences the discharging of the sensor.

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: 19 May 2015 06:34
Last Modified: 13 Apr 2016 06:44
URI: https://eref.uni-bayreuth.de/id/eprint/13628