Metal Oxide Gas Sensor Drift Compensation Using a Two-Dimensional Classifier Ensemble

Sensors

Hang Liu¹  Renzhi Chu²  Zhenan Tang² 

[1] College of Electronic Science and Technology, Dalian University of Technology, No. 2 Linggong Road, Dalian 116023, China;

关键词: sensor drift;    metal oxide sensors;    classifier ensemble;    support vector machines;   

DOI  :  10.3390/s150510180

来源: mdpi

【 摘 要 】

Sensor drift is the most challenging problem in gas sensing at present. We propose a novel two-dimensional classifier ensemble strategy to solve the gas discrimination problem, regardless of the gas concentration, with high accuracy over extended periods of time. This strategy is appropriate for multi-class classifiers that consist of combinations of pairwise classifiers, such as support vector machines. We compare the performance of the strategy with those 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 two-dimensional ensemble outperforms the other methods considered. Furthermore, we propose a pre-aging process inspired by that applied to the sensors to improve the stability of the classifier ensemble. The experimental results demonstrate that the weight of each multi-class classifier model in the ensemble remains fairly static before and after the addition of new classifier models to the ensemble, when a pre-aging procedure is applied.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.