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Proceedings Paper

New ways of chemical sensing via fluctuation spectroscopy
Author(s): Laszlo B. Kish; R. Vajtai; J. Solis; Claes-Goeran Granqvist; V. Lantto
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Paper Abstract

Intensive research has been going on during the past several years to use chemical and biological sensor elements to develop systems known as electronic noses and electronic tongues. They consist of several sensor elements and a pattern recognition unit comprising data acquisition and usually a neural network software. The neural network, or a similar pattern recognition tool, is necessary due to the non-linear character of the sensor system, which "learns" to interpret data during a calibration process. There are several important practical issues, such as ways to decrease the number of necessary sensors, ascertaining sufficient sensitivity, obtaining reproducibility, diminishing the need for frequent calibration, and establishing the most suitable pattern recognition technique. This paper addresses the need for multiple sensors and demonstrates that measurements of conductivity fluctuations in a sensor can lower the required number of sensors to, in principle, only one. Moreover, we shall show that a new kind of electronic nose, a sampling-and-hold electronic nose can be realized in this way.

Paper Details

Date Published: 16 March 2001
PDF: 6 pages
Proc. SPIE 4236, Smart Electronics and MEMS II, (16 March 2001); doi: 10.1117/12.418745
Show Author Affiliations
Laszlo B. Kish, Uppsala Univ. (United States)
R. Vajtai, Uppsala Univ. (Sweden)
J. Solis, Uppsala Univ. (Sweden)
Claes-Goeran Granqvist, Uppsala Univ. (Sweden)
V. Lantto, Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 4236:
Smart Electronics and MEMS II
Derek Abbott; Vijay K. Varadan; Karl F. Boehringer, Editor(s)

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