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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Latest update: 20 Sep 2022
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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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