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Sensors 2014, 14(7), 12533-12559; doi:10.3390/s140712533

Augmented Switching Linear Dynamical System Model for Gas Concentration Estimation with MOX Sensors in an Open Sampling System

Department of Mechanical Engineering, Division PMA, KU Leuven, BE-3001 Heverlee, Belgium
Centre for Applied Autonomous Sensor Systems, Örebro University, Örebro SE-70182, Sweden
Faculty of Engineering Sciences, KU Leuven, BE-3001 Heverlee, Belgium
Department of Mechanical Engineering, Section CST, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
Author to whom correspondence should be addressed.
Received: 26 May 2014 / Revised: 1 July 2014 / Accepted: 4 July 2014 / Published: 11 July 2014
(This article belongs to the Section Chemical Sensors)
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In this paper, we introduce a Bayesian time series model approach for gas concentration estimation using Metal Oxide (MOX) sensors in Open Sampling System (OSS). Our approach focuses on the compensation of the slow response of MOX sensors, while concurrently solving the problem of estimating the gas concentration in OSS. The proposed Augmented Switching Linear System model allows to include all the sources of uncertainty arising at each step of the problem in a single coherent probabilistic formulation. In particular, the problem of detecting on-line the current sensor dynamical regime and estimating the underlying gas concentration under environmental disturbances and noisy measurements is formulated and solved as a statistical inference problem. Our model improves, with respect to the state of the art, where system modeling approaches have been already introduced, but only provided an indirect relative measures proportional to the gas concentration and the problem of modeling uncertainty was ignored. Our approach is validated experimentally and the performances in terms of speed of and quality of the gas concentration estimation are compared with the ones obtained using a photo-ionization detector. View Full-Text
Keywords: metal oxide semiconductor sensor; gas sensing; Bayesian inference metal oxide semiconductor sensor; gas sensing; Bayesian inference

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Di Lello, E.; Trincavelli, M.; Bruyninckx, H.; De Laet, T. Augmented Switching Linear Dynamical System Model for Gas Concentration Estimation with MOX Sensors in an Open Sampling System. Sensors 2014, 14, 12533-12559.

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