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By applying the pulsed polarization technique, a thimble-type lambda probecan be used as a NO<sub><i>x</i></sub> sensor in the low ppm range. Due to the robustnessof the sensor in harsh exhaust gas environments, this approach has manyopportunities for application. The temperature operating range for best NOsensing properties is a crucial parameter. The sensor temperature changeswith the ambient gas temperature, but can be stabilized actively by internalheating in a certain temperature range. This study evaluates in detail thetemperature influence on NO sensitivity, so that an optimum operating pointcan be derived from these results using a dynamic measurement technique.Stepwise NO concentration changes between 0 and 12.5 ppm in syntheticexhausts demonstrate the potential of the concept

journal of sensors and sensor systems

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