title: A wireless electronic nose system using a Fe2O3 gas sensing array and least squares support vector regression.
abstract: This paper describes the design and implementation of a wireless electronic nose (WEN) system which can online detect the combustible gases methane and hydrogen (CH(4)/H(2)) and estimate their concentrations, either singly or in mixtures. The system is composed of two wireless sensor nodes--a slave node and a master node. The former comprises a Fe(2)O(3) gas sensing array for the combustible gas detection, a digital signal processor (DSP) system for real-time sampling and processing the sensor array data and a wireless transceiver unit (WTU) by which the detection results can be transmitted to the master node connected with a computer. A type of Fe(2)O(3) gas sensor insensitive to humidity is developed for resistance to environmental influences. A threshold-based least square support vector regression (LS-SVR)estimator is implemented on a DSP for classification and concentration measurements. Experimental results confirm that LS-SVR produces higher accuracy compared with artificial neural networks (ANNs) and a faster convergence rate than the standard support vector regression (SVR). The designed WEN system effectively achieves gas mixture analysis in a real-time process.
authors.affiliation: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China. kaisong@hit.edu.cn
authors.forename: Kai
authors.initials: K
authors.lastname: Song
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Qi
authors.initials: Q
authors.lastname: Liu
authors.forename: Hongquan
authors.initials: H
authors.lastname: Zhang
authors.forename: Yingguo
authors.initials: Y
authors.lastname: Cheng
mesh_terms: D004867:Equipment Design; D005290:Ferric Compounds / Q000737:chemistry*; D005740:Gases / Q000032:analysis; D006859:Hydrogen / Q000032:analysis; D016018:Least-Squares Analysis; D008697:Methane / Q000032:analysis; D012984:Software; D013696:Temperature; D014173:Transistors, Electronic; D059015:Wireless Technology
chemical_list: D005290:Ferric Compounds; D005740:Gases; C000499:ferric oxide; D006859:Hydrogen; D008697:Methane