A novel approach for detecting HMDSO poisoning of metal oxide gas sensors and improving their stability by temperature cycled operation
In this paper we study the effect of hexamethyldisiloxane (HMDSO) vapor on an SnO<sub>2</sub>-based gas sensor (GGS 1330, UST Umweltsensortechnik GmbH, Geschwenda, Germany) in a temperature cycled operation (TCO). We show that HMDSO poisoning can be quantified at early stages (85 to 340...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-10-01
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| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | http://www.j-sens-sens-syst.net/4/305/2015/jsss-4-305-2015.pdf |
| Summary: | In this paper we study the effect of hexamethyldisiloxane (HMDSO) vapor on
an SnO<sub>2</sub>-based gas sensor (GGS 1330, UST Umweltsensortechnik GmbH,
Geschwenda, Germany) in a temperature cycled operation (TCO). We show that
HMDSO poisoning can be quantified at early stages (85 to 340 ppm × min)
with a resolution of ±85 ppm × min using TCO. This novel
approach for sensor self-monitoring provides a simple method for early
detection of HMDSO poisoning. It is thereby possible to detect poisoning
before the sensor function is strongly impaired. In this paper we show that
by using an appropriate normalization of the sensor data, the stability of gas
discrimination by linear discriminant analysis (LDA) can be improved, which
in turn facilitates a more accurate determination of the poisoning state by
a hierarchical LDA discrimination.
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For a specific temperature cycle and feature extraction approach, we show
that identification of ethanol and carbon monoxide is still possible after
poisoning with 900 ppm × min HMDSO, i.e. a HMDSO poisoning dose more than
twice as high as required by DIN EN 50194-1. |
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| ISSN: | 2194-8771 2194-878X |