Data representation and feature selection for colorimetric sensor arrays used as explosives detectors

Tommy S. Alstrøm, Jan Larsen, Natalie V. Kostesha, Mogens H. Jakobsen, Anja Boisen

AbstractWithin the framework of the strategic research project Xsense at the Technical University of Denmark, we are developing a colorimetric sensor array which can be useful for detection of explosives like DNT, TNT, HMX, RDX and TATP and identification of volatile organic compounds in the presence of water vapor in air. In order to analyze colorimetric sensors with statistical methods, the sensory output must be put into numerical form suitable for analysis. We present new ways of extracting features from a colorimetric sensor and determine the quality and robustness of these features using machine learning classifiers. Sensors, and in particular explosive sensors, must not only be able to classify explosives, they must also be able to measure the certainty of the classifier regarding the decision it has made. This means there is a need for classifiers that not only give a decision, but also give a posterior probability about the decision. We will compare K-nearest neighbor, artificial neural networks and sparse logistic regression for colorimetric sensor data analysis. Using the sparse solutions we perform feature selection and feature ranking and compare to Gram-Schmidt orthogonalization.
Keywordsartificial neural networks (ANN), chemo– selective compounds, classification, colorimetric sensor array, DNT, explosives detection, feature ranking, Gram–Schmidt orthogonalization, K–nearest neighbor (KNN), sparse logistic regression (SLR), TNT
TypeConference paper [With referee]
ConferenceIEEE International Workshop on Machine Learning for Signal Processing
Year2011    Month September
PublisherIEEE Press
ISBN / ISSNDOI: 10.1109/MLSP.2011.6064615
Electronic version(s)[pdf]
Publication link*%26filter%3DAND%28NOT%284283010803%29%29%26searchField%3DSearch+All%26queryText%3Dalstr%C3%B8m+larsen
BibTeX data [bibtex]
IMM Group(s)Intelligent Signal Processing

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