Sensors 2012, 12(3), 2831-2850; doi:10.3390/s120302831
Article

Dual Mode NOx Sensor: Measuring Both the Accumulated Amount and Instantaneous Level at Low Concentrations

1 Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany 2 Ford Research and Advanced Engineering, Dearborn, MI 48124, USA Andrea Groß formerly Andrea Geupel.
* Author to whom correspondence should be addressed.
Received: 26 December 2011; in revised form: 22 February 2012 / Accepted: 23 February 2012 / Published: 1 March 2012
(This article belongs to the Section Chemical Sensors)
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Abstract: The accumulating-type (or integrating-type) NOx sensor principle offers two operation modes to measure low levels of NOx: The direct signal gives the total amount dosed over a time interval and its derivative the instantaneous concentration. With a linear sensor response, no baseline drift, and both response times and recovery times in the range of the gas exchange time of the test bench (5 to 7 s), the integrating sensor is well suited to reliably detect low levels of NOx. Experimental results are presented demonstrating the sensor’s integrating properties for the total amount detection and its sensitivity to both NO and to NO2. We also show the correlation between the derivative of the sensor signal and the known gas concentration. The long-term detection of NOx in the sub-ppm range (e.g., for air quality measurements) is discussed. Additionally, a self-adaption of the measurement range taking advantage of the temperature dependency of the sensitivity is addressed.
Keywords: dosimeter; signal derivative; sensitivity NO/NO2; operation temperature; measurement range adaption; response rise/recovery time; exhaust gas sensor

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MDPI and ACS Style

Groß, A.; Beulertz, G.; Marr, I.; Kubinski, D.J.; Visser, J.H.; Moos, R. Dual Mode NOx Sensor: Measuring Both the Accumulated Amount and Instantaneous Level at Low Concentrations. Sensors 2012, 12, 2831-2850.

AMA Style

Groß A, Beulertz G, Marr I, Kubinski DJ, Visser JH, Moos R. Dual Mode NOx Sensor: Measuring Both the Accumulated Amount and Instantaneous Level at Low Concentrations. Sensors. 2012; 12(3):2831-2850.

Chicago/Turabian Style

Groß, Andrea; Beulertz, Gregor; Marr, Isabella; Kubinski, David J.; Visser, Jaco H.; Moos, Ralf. 2012. "Dual Mode NOx Sensor: Measuring Both the Accumulated Amount and Instantaneous Level at Low Concentrations." Sensors 12, no. 3: 2831-2850.

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