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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 Physical 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Dobrokhotov, V.; Larin, A.; Sowell, D. Vapor Trace Recognition Using a Single Nonspecific Chemiresistor. Sensors 2013, 13, 9016-9028.

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