E7.2 - Temperature Modulated Thermoelectric Gas Sensors
- Event
- AMA Conferences 2015
2015-05-19 - 2015-05-21
Nürnberg, Germany - Band
- Proceedings SENSOR 2015
- Chapter
- E7 - Gas Sensors III
- Author(s)
- G. Hagen, N. Leupold, S. Wiegärtner, H. Wittmann, R. Moos - University of Bayreuth (Germany)
- Pages
- 704 - 707
- DOI
- 10.5162/sensor2015/E7.2
- ISBN
- 978-3-9813484-8-4
- Price
- free
Abstract
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.