Articles | Volume 7, issue 1
J. Sens. Sens. Syst., 7, 79–84, 2018
https://doi.org/10.5194/jsss-7-79-2018

Special issue: Sensor/IRS2 2017

J. Sens. Sens. Syst., 7, 79–84, 2018
https://doi.org/10.5194/jsss-7-79-2018

Regular research article 16 Feb 2018

Regular research article | 16 Feb 2018

A pathway to eliminate the gas flow dependency of a hydrocarbon sensor for automotive exhaust applications

Gunter Hagen et al.

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Cited articles

Bischof, M., Kessler, B., Moos, R., Müller, R., Müller, W., and Plog, C.: Arrangement of a heating layer for a high-temperature gas sensor, US Patent Specification, US 6,861,939 B1, 1999. 
Deutschmann, O. and Grunwaldt, J.-D.: Exhaust gas aftertreatment in mobile systems: status, challenges, and perspectives, Chem.-Ing.-Tech., 85, 595–617, https://doi.org/10.1002/cite.201200188, 2013. 
Hagen, G., Leupold, N., Wiegärtner, S., and Moos, R.: Sensor Tool for Fast Catalyst Material Characterization, Top. Catal., 60, 312–317, https://doi.org/10.1007/s11244-016-0617-8, 2017. 
Kita, J., Wiegärtner, S., Moos, R., Weigand, P., Pliscott, A., LaBranche, M. H., and Glicksman, H. D.: Screen-printable type S thermocouple for thick-film technology, Procedia Engineer., 120, 828–831, https://doi.org/10.1016/j.proeng.2015.08.692, 2015. 
Moos, R.: Automotive Exhaust Gas Sensors, in: Encyclopedia of Sensors, edited by: Grimes, C. A., Dickey, E. C., and Pishko, M. V., 1, 295–312, American Scientific Publishers, Stevenson Ranch, USA, 2006. 
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Short summary
Monitoring hydrocarbon concentrations in automotive exhausts is affected by flow rate changes. The signal of thermoelectric gas sensors is a thermovoltage. Its origin is a temperature difference that depends on the flow rate. To avoid this noise effect, the sensor can be installed in a defined bypass position. As shown by simulation and experiments, the gas flow around the sensor is almost turbulence-free and the signal only depends on the hydrocarbon concentration and not on the flow rate.
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