P35 - Qualification of a Gas Mixing Apparatus for Complex Trace Gas Mixtures

Event
16. Dresdner Sensor-Symposium 2022
2022-12-05 - 2022-12-07
Dresden
Band
Poster
Chapter
Miniaturisierte Sensorik und Messsysteme
Author(s)
D. Arendes, J. Amann, O. Brieger, C. Bur, A. Schütze - Saarland University, Saarbrücken/D
Pages
183 - 188
DOI
10.5162/16dss2022/P35
ISBN
978-3-9819376-7-1
Price
free

Abstract

The detection of gases, especially Volatile Organic Compounds (VOCs), is important for many areas of daily life, such as Indoor Air Quality (IAQ) [1]. VOCs in particular can negatively affect cognitive performance or even cause health impairments in higher concentrations or long-term exposure [2]. However, the current gold standard to detect these VOCs, gas chromatography with mass spectrometry (GC-MS), is not suitable for these everyday situations due to cost and real-time constraints. A cost-effective alternative for IAQ monitoring is offered by metal oxide semiconductor (MOS) gas sensors, which offer, however, very poor selectivity. Temperature cycled operation (TCO) [3] can be used to boost the sensitivity as well as increase the selectivity together with advanced signal processing, but requires a complex lab calibration [4]. For this calibration, a gas mixing apparatus (GMA) is used to provide the required gas mixtures. Due to the large number of VOCs found in indoor air, it is not possible to include all occurring VOCs in the calibration. In a previous work we could show that it is sufficient to use only a few representatives per substance group, due to the fact that the reaction of MOS sensors depend mostly on the functional group of the VOC.

Download