NO Detection by Pulsed Polarization of Lambda Probes–Influence of the Reference Atmosphere
1
Department of Functional Materials, University of Bayreuth, Bayreuth 95440, Germany
2
Corporate Technology, Siemens AG, Munich 81739, Germany
*
Author to whom correspondence should be addressed.
Sensors 2013, 13(12), 16051-16064; https://doi.org/10.3390/s131216051
Received: 30 September 2013
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Revised: 15 November 2013
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Accepted: 15 November 2013
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Published: 26 November 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
The pulsed polarization measurement technique using conventional thimble type lambda probes is suitable for low ppm NOx detection in exhaust gas applications. To evaluate the underlying sensor mechanism, the unknown influence of the reference atmosphere on the NO sensing behavior is investigated in this study. Besides answering questions with respect to the underlying principle, this investigation can resolve the main question of whether a simplified sensor element without reference may be also suitable for NO sensing using the pulsed polarization measurement technique. With an adequate sensor setup, the reference atmosphere of the thimble type lambda probe is changed completely after a certain diffusion time. Thus, the sensor response regarding NO is compared with and without different gas atmospheres on both electrodes. It is shown that there is still a very good NO sensitivity even without reference air, although the NO response is reduced due to non-existing overlying mixed potential type voltage, which is otherwise caused by different atmospheres on both electrodes. Considering these results, we see an opportunity to simplify the standard NOx sensor design by omitting the reference electrode.
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Keywords:
lambda probe; UEGO; NO sensor; NOx sensor; mixed potential; YSZ; pulsed polarization; reference atmosphere
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MDPI and ACS Style
Fischer, S.; Schönauer-Kamin, D.; Pohle, R.; Fleischer, M.; Moos, R. NO Detection by Pulsed Polarization of Lambda Probes–Influence of the Reference Atmosphere. Sensors 2013, 13, 16051-16064. https://doi.org/10.3390/s131216051
AMA Style
Fischer S, Schönauer-Kamin D, Pohle R, Fleischer M, Moos R. NO Detection by Pulsed Polarization of Lambda Probes–Influence of the Reference Atmosphere. Sensors. 2013; 13(12):16051-16064. https://doi.org/10.3390/s131216051
Chicago/Turabian StyleFischer, Sabine, Daniela Schönauer-Kamin, Roland Pohle, Maximilian Fleischer, and Ralf Moos. 2013. "NO Detection by Pulsed Polarization of Lambda Probes–Influence of the Reference Atmosphere" Sensors 13, no. 12: 16051-16064. https://doi.org/10.3390/s131216051
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