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Sensors 2013, 13(7), 9160-9173; doi:10.3390/s130709160
Article

Metal Oxide Gas Sensor Drift Compensation Using a Dynamic Classifier Ensemble Based on Fitting

*  and
Received: 18 April 2013; in revised form: 11 July 2013 / Accepted: 15 July 2013 / Published: 17 July 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
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Abstract: Sensor drift is currently the most challenging problem in gas sensing. We propose a novel ensemble method with dynamic weights based on fitting (DWF) to solve the gas discrimination problem, regardless of the gas concentration, with high accuracy over extended periods of time. The DWF method uses a dynamic weighted combination of support vector machine (SVM) classifiers trained by the datasets that are collected at different time periods. In the testing of future datasets, the classifier weights are predicted by fitting functions, which are obtained by the proper fitting of the optimal weights during training. We compare the performance of the DWF method with that of competing methods in an experiment based on a public dataset that was compiled over a period of three years. The experimental results demonstrate that the DWF method outperforms the other methods considered. Furthermore, the DWF method can be further optimized by applying a fitting function that more closely matches the variation of the optimal weight over time.
Keywords: sensor drift; metal oxide sensors; ensemble method; dynamic weights sensor drift; metal oxide sensors; ensemble method; dynamic weights
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

Liu, H.; Tang, Z. Metal Oxide Gas Sensor Drift Compensation Using a Dynamic Classifier Ensemble Based on Fitting. Sensors 2013, 13, 9160-9173.

AMA Style

Liu H, Tang Z. Metal Oxide Gas Sensor Drift Compensation Using a Dynamic Classifier Ensemble Based on Fitting. Sensors. 2013; 13(7):9160-9173.

Chicago/Turabian Style

Liu, Hang; Tang, Zhenan. 2013. "Metal Oxide Gas Sensor Drift Compensation Using a Dynamic Classifier Ensemble Based on Fitting." Sensors 13, no. 7: 9160-9173.


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