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NOx-detection by pulsed polarization of lambda probes

Titelangaben

Fischer, Sabine ; Schönauer-Kamin, Daniela ; Pohle, Roland ; Magori, Erhard ; Farber, Boris ; Fleischer, Maximilian ; Moos, Ralf:
NOx-detection by pulsed polarization of lambda probes.
2012
Veranstaltung: 14th International Meeting on Chemical Sensors - IMCS 2012 , 20.-23.05.2012 , Nürnberg, Germany.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Sonstige Präsentationstyp)
DOI: https://doi.org/10.5162/IMCS2012/P1.6.4

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

Conventional thimble type lambda sensors combined with a pulse discharge technique were used for NOx detection in a simulated combustion exhaust gas with varying oxygen and moisture levels. Open circuit discharge characteristics after defined polarization pulses with alternating polarity show strong dependencies on NOx (112 mV / decade) in the lowest ppm range (0.5 - 50 ppm). Increase in NOx concentration accelerates sensor discharge, whereby the discharge curves following negative pulses are more affected by the NOx content compared to positive pulses. The sensitivities to NO and NO2 are equal and measurement of total NOx is possible. The discharge curves are affected by the oxygen and the water content. An increase in O2 concentration results in a shift of the discharge curves to negative voltages. Additionally a decreased sensor response to NOx is obtained for both polarization polarities. The water concentration has the opposite effect. All discharge curves are shifted to positive voltages with increasing H2O content. As a result, the sensor response increases strongly. The voltage shifts due to O2 and H2O are expected from Nernstian behavior of a lambda probe, whereby moisture influence is stronger compared to O2. The feasibility of the method as an exhaust gas total NOx measurement system is confirmed.

Weitere Angaben

Publikationsform: Veranstaltungsbeitrag (Sonstige)
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Profilfelder
Profilfelder > Advanced Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 15 Apr 2015 12:25
Letzte Änderung: 14 Apr 2016 06:41
URI: https://eref.uni-bayreuth.de/id/eprint/10145