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Sensors 2014, 14(11), 20372-20381; doi:10.3390/s141120372

Temperature Modulation of a Catalytic Gas Sensor

1
Institute for Microsensors, -Actuators and -Systems (IMSAS), University of Bremen, Otto-Hahn-Allee NW1, Bremen 28359, Germany
2
Institute of Applied and Physical Chemistry (IAPC), University of Bremen, Leobener Str. NW2, Bremen 28359, Germany
*
Author to whom correspondence should be addressed.
Received: 31 August 2014 / Revised: 12 October 2014 / Accepted: 22 October 2014 / Published: 29 October 2014
(This article belongs to the Section Chemical Sensors)
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Abstract

The use of catalytic gas sensors usually offers low selectivity, only based on their different sensitivities for various gases due to their different heats of reaction. Furthermore, the identification of the gas present is not possible, which leads to possible misinterpretation of the sensor signals. The use of micro-machined catalytic gas sensors offers great advantages regarding the response time, which allows advanced analysis of the sensor response. By using temperature modulation, additional information about the gas characteristics can be measured and drift effects caused by material shifting or environmental temperature changes can be avoided. In this work a miniaturized catalytic gas sensor which offers a very short response time (<150 ms) was developed. Operation with modulated temperature allows analysis of the signal spectrum with advanced information content, based on the Arrhenius approach. Therefore, a high-precise electronic device was developed, since theory shows that harmonics induced by the electronics must be avoided to generate a comprehensible signal. View Full-Text
Keywords: catalytic gas sensor; fast response; temperature modulation; harmonics; spectrum catalytic gas sensor; fast response; temperature modulation; harmonics; spectrum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Brauns, E.; Morsbach, E.; Kunz, S.; Baeumer, M.; Lang, W. Temperature Modulation of a Catalytic Gas Sensor. Sensors 2014, 14, 20372-20381.

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