1.2.2 FTTCA - Gasanalyse mit thermisch modulierten Wärmeleitfähigkeits-Sensoren mit Fourier-Analyse des Messsignals
- Event
- 16. GMA/ITG-Fachtagung Sensoren und Messsysteme 2012
2012-05-22 - 2012-05-23
Nürnberg, Germany - Chapter
- 1.2 Chemische Sensoren
- Author(s)
- H. Grienauer - AMS GmbH, Dielheim
- Pages
- 54 - 61
- DOI
- 10.5162/sensoren2012/1.2.2
- ISBN
- 978-3-9813484-0-8
- Price
- free
Abstract
Introduction to Temperature Modulated Thermal Conductivity Analysis. Temperature Modulated Thermal Conductivity Analysis is a fairly new method in gas analysis. Classical thermal conductivity analysis is limited to binary gas mixtures, whereas this new approach opens the way for the analysis of three, four and more gas components.
It makes use of both a physical effect and of the availability of new types of Thermal Conductivity Analysis (TCA-) sensors. The sensor is a miniaturized TC-sensor with an extremely low thermal mass. It allows a sinusoidal temperature variation of ±40….±70°C within the fraction of a second. The physical effect lies in the differences of the temperature dependence of the thermal conductivity of various gases. Reliable theoretical or experimental data for this temperature dependence are not available. The application of fast Fourier-Transform algorithm to the sensor signal and subsequent establishing of a calibration matrix make the analysis of three- and four-component gas mixtures feasible.