E7.2 - Temperature Modulated Thermoelectric Gas Sensors
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- E7 - Gas Sensors III
- G. Hagen, N. Leupold, S. Wiegärtner, H. Wittmann, R. Moos - University of Bayreuth (Germany)
- 704 - 707
The output of a thermoelectric gas sensor is a voltage signal that is proportional to the exothermicity, generated during oxidation of reducing gases on a catalyst. A temperature difference between the catalytically active (due to a catalyst film) and an inert part of the device is measured by screen-printed thermopiles. When the absolute sensor temperature is modulated, the resulting signals depend on the catalyst’s conversion behavior and are a characteristic for certain gas species. It could be shown that differentiation between gas components, e.g. alkanes and alkenes in a gas mixture is possible.