Journal of Sensors and Sensor Systems
Journal of Sensors and Sensor Systems
JSSS
Articles | Volume 7, issue 1
Articles | Volume 7, issue 1
https://doi.org/10.5194/jsss-7-79-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/jsss-7-79-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 7, issue 1
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, Antonia Harsch, and Ralf Moos

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Latest update: 27 Jun 2025
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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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Special issue
Sensor/IRS2 2017