Selective detector for carbon monoxide

US8920627B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Maximilian Fleischer · Ehrenkirchen, DE
• Ulrich Hoefer · Zug, CH
• Roland Pohle · Füssen, DE
• Stefan Stegmeier · Munich, DE

Key dates

• Filing date: Mar 30, 2010
• Grant date: Dec 30, 2014
• Expiry date: Nov 27, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/004
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An embodiment of the invention generally relates to an FET-based detector for carbon monoxide which is based on two sensitive layers. In at least one embodiment, the first of the sensitive layers is catalytically active and therefore reacts equally to alcohols, in particular ethanol, and carbon monoxide. The second of the sensitive layers is not catalytically active and therefore does not react to carbon monoxide, but only to ethanol. The concentration of carbon monoxide can be deduced from the comparison of the signals of the two layers. The two sensitive layers are implemented via similar metal oxide layers, an additional layer having a catalyst such as palladium being provided for the catalytically active layer. Alternatively, two different layers can be used, one of which is already catalytically active without an additional layer.