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INTELLIGENT GAS-SENSING USING AN INTEGRATED SENSOR PAIR
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UNSPECIFIED (1995) INTELLIGENT GAS-SENSING USING AN INTEGRATED SENSOR PAIR. In: Eurosensors VIII, TOULOUSE, FRANCE, SEP 25-28, 1994. Published in: SENSORS AND ACTUATORS B-CHEMICAL, 27 (1-3). pp. 261-266. ISSN 0925-4005.
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Abstract
The performance of conductometric gas sensors (e.g. semiconducting oxide) is often reduced by the poisoning of the active film or by poor long-term stability of the output signal. In this paper we propose the use of an integrated pair of sensing elements, one with a narrow electrode gap and the other with a wide electrode gap compared with the film thickness, to recognise or overcome these disadvantages. Equations are derived that describe the steady-state response of such a device for the two limiting cases of a uniform gas concentration within the film (type I) and a distance-dependent one with a boundary (type II). The characteristic response, or operating curve, of a sensor pair for a type I material can then be used as a realtime diagnostic for poisoning of the film, whereas the response for a type II material can be used to improve sensor stability by eliminating undesirable common-mode signals. The basic principles apply to several classes of materials including both organic semiconductors (usually type I) and inorganic semiconductors (usually type II).
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | SENSORS AND ACTUATORS B-CHEMICAL | ||||
Publisher: | ELSEVIER SCIENCE SA LAUSANNE | ||||
ISSN: | 0925-4005 | ||||
Official Date: | June 1995 | ||||
Dates: |
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Volume: | 27 | ||||
Number: | 1-3 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 261-266 | ||||
Publication Status: | Published | ||||
Title of Event: | Eurosensors VIII | ||||
Location of Event: | TOULOUSE, FRANCE | ||||
Date(s) of Event: | SEP 25-28, 1994 |
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