UNSPECIFIED (1993) SENSITIVITY ENHANCEMENT FOR GAS-SENSING AND ELECTRONIC NOSE APPLICATIONS. In: EUROSENSORS 6, OCT 05-07, 1992, SAN SEBASTIAN, SPAIN.

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Abstract

The sensitivity of varistor types of gas detector may be severely restricted by conventional techniques of deriving the system input signal from a voltage change arising from a dual-arm potential divider. A much more effective means of analogue signal processing for high sensitivity can be achieved through the use of a.c. bridge methods, together with narrow-band filtering to enhance the signal-to-noise ratio. Such methods have been applied to commercial tin dioxide sensing devices intended for use in an electronic nose and we present results showing them to give sensitivity improvements of about two orders of magnitude, with an expectancy of further improvement following circuit refinement. The techniques are equally applicable to the sensing of individual gases, gas mixtures or complex odours.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	SENSORS AND ACTUATORS B-CHEMICAL
Publisher:	ELSEVIER SCIENCE SA LAUSANNE
ISSN:	0925-4005
Date:	October 1993
Volume:	16
Number:	1-3
Number of Pages:	4
Page Range:	pp. 256-259
Publication Status:	Published
Title of Event:	EUROSENSORS 6
Location of Event:	SAN SEBASTIAN, SPAIN
Date(s) of Event:	OCT 05-07, 1992
URI:	http://wrap.warwick.ac.uk/id/eprint/21072

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