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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
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Volume 4, issue 2
J. Sens. Sens. Syst., 4, 321-329, 2015
https://doi.org/10.5194/jsss-4-321-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: High-temperature sensors and materials

J. Sens. Sens. Syst., 4, 321-329, 2015
https://doi.org/10.5194/jsss-4-321-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

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. Fischer1,2, D. Schönauer-Kamin1, R. Pohle2, M. Fleischer2, and R. Moos1 S. Fischer et al.
  • 1Department of Functional Materials, University of Bayreuth, Bayreuth, Germany
  • 2Corporate Technology, Siemens AG, Munich, Germany

Abstract. By applying the pulsed polarization technique, a thimble-type lambda probe can be used as a NOx sensor in the low ppm range. Due to the robustness of the sensor in harsh exhaust gas environments, this approach has many opportunities for application. The temperature operating range for best NO sensing properties is a crucial parameter. The sensor temperature changes with the ambient gas temperature, but can be stabilized actively by internal heating in a certain temperature range. This study evaluates in detail the temperature influence on NO sensitivity, so that an optimum operating point can be derived from these results using a dynamic measurement technique. Stepwise NO concentration changes between 0 and 12.5 ppm in synthetic exhausts demonstrate the potential of the concept.

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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.
Thimble-type lambda probes that are known for their robustness in harsh exhausts can also be...
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