期刊
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
卷 132, 期 -, 页码 91-102出版社
ELSEVIER
DOI: 10.1016/j.chemolab.2014.01.001
关键词
Active sensing; Sensor arrays; Chemical classification; Metal-oxide sensors; Fably-Perot interferometers
类别
资金
- National Science Foundation [1002028]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1002028] Funding Source: National Science Foundation
This paper presents Posterior-Weighted Active Search (PWAS), an active-sensing algorithm for classification of volatile compounds with arrays of tunable chemical sensors. The algorithm combines concepts from feature subset selection and sequential Bayesian filtering to optimize the sensor array tunings on-the-fly based on information from previous measurements. Namely, the algorithm maintains an estimate of the posterior probability associated with each chemical class, and updates it sequentially upon arrival of each new sensor observations. The updated posteriors are then used to bias the selection of the next sensor tunings towards the most likely classes, in this way reducing the number of measurements required for discrimination. We characterized PWAS on a database of infrared absorption spectra with 250 analytes, and then validated it experimentally on an array of metal-oxide sensors. Our results show that PWAS outperforms passive-sensing approaches based on sequential forward selection, both in terms of classification performance and robustness to noise in sensor measurements. (c) 2014 Elsevier B.V. All rights reserved.
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