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Sensors 2013, 13(7), 9016-9028; doi:10.3390/s130709016
Article

Vapor Trace Recognition Using a Single Nonspecific Chemiresistor

* ,
 and
Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY 42101, USA
* Author to whom correspondence should be addressed.
Received: 29 May 2013 / Revised: 27 June 2013 / Accepted: 8 July 2013 / Published: 12 July 2013
(This article belongs to the Section Chemical Sensors)
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Abstract

An application of spectral analysis to the transient response signals of ALD-fabricated conductometric sensors (chemiresistors) upon exposure to short vapor pulses is discussed. It is based on the representation of a response curve in the frequency domain, followed by the multi-dimensional Quadratic Discriminant Analysis (QDA) for analyte identification. Compared to the standard steady-state amplitude analysis, this technique does not depend on a short-term sensor drift, does not have limitations for the number of extracted features and has a strict physical validation. Effective recognition of some relatively simple combustible analytes (acetone, toluene, ethanol) was demonstrated using a single nonspecific chemiresistor.
Keywords: sensor; electronic nose; pattern recognition; transient response; LDA; QDA sensor; electronic nose; pattern recognition; transient response; LDA; QDA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Dobrokhotov, V.; Larin, A.; Sowell, D. Vapor Trace Recognition Using a Single Nonspecific Chemiresistor. Sensors 2013, 13, 9016-9028.

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