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Thimble-type lambda probes that are known for their robustness in harsh exhausts can also be used as an NOx sensor by applying the pulsed polarization technique. This study evaluates in detail the influence of temperature on the NO sensitivity, so that an optimum operating point can be derived. Stepwise NO concentration changes between 0 and 12.5 ppm in synthetic exhausts demonstrate the high potential of this concept.
Articles | Volume 4, issue 2
J. Sens. Sens. Syst., 4, 321–329, 2015
https://doi.org/10.5194/jsss-4-321-2015

Special issue: High-temperature sensors and materials

J. Sens. Sens. Syst., 4, 321–329, 2015
https://doi.org/10.5194/jsss-4-321-2015

Regular research article 23 Nov 2015

Regular research article | 23 Nov 2015

Influence of operation temperature variations on NO measurements in low concentrations when applying the pulsed polarization technique to thimble-type lambda probes

S. Fischer et al.

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Cited articles

Badwal, S. P. S.: Zirconia-based solid electrolytes: microstructure, stability and ionic conductivity, Solid State Ionics, 52, 23–32, 1992.
Baunach, T., Schänzlin, K., and Diehl, L.: Sauberes Abgas durch Keramiksensoren, Physik Journal, 5, 33–38, 2006 (in German).
Fergus, J. W.: Materials for high temperature electrochemical NOx gas sensors, Sensor Actuat. B-Chem., 121, 652–663, 2007.
Fischer, S., Pohle, R., Farber, B., Proch, R., Kaniuk, J., Fleischer, M., and Moos, R.: Method for detection of NOx in exhaust gases by pulsed discharge measurements using standard zirconia-based lambda sensors, Sensor Actuat. B-Chem., 147, 780–785, 2010.
Fischer, S., Schönauer-Kamin, D., Pohle, R., Magori, E., Farber, B., Fleischer, M., and Moos, R.: NOx-detection by pulsed polarization of lambda probes, 14th International Meeting on Chemical Sensors, IMCS 14, Nuremberg, Germany, 20–23 May 2012, 1050–1053, https://doi.org/10.5162/IMCS2012/P1.6.4, 2012a.

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Short summary
Thimble-type lambda probes that are known for their robustness in harsh exhausts can also be used as an NOx sensor by applying the pulsed polarization technique. This study evaluates in detail the influence of temperature on the NO sensitivity, so that an optimum operating point can be derived. Stepwise NO concentration changes between 0 and 12.5 ppm in synthetic exhausts demonstrate the high potential of this concept.
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