Portable electronic nose system with gas sensor array and artificial neural network

A portable electronic nose system has been fabricated and characterized usi ng an oxide semiconductor gas sensor array and artificial neural network. T he sensor array consists of such thick-film oxide semiconductor sensing mat erials as Pd-doped WO,, Pt-doped SnO2, TiO2-Sb2O5-Pd-doped SnO2, TiO2-Sb2O5 -Pd-doped SnO2 + Pd-coated layer, Al2O3-doped ZnO and PdCl2-doped SnO2. The portable electronic nose system consists of an Intel 80c196kc as CPU, an E EPROM and an LCD for displaying gas concentrations, etc. As an application, the system has been used to identify 26 CO/HC car exhausting gases and the identification has been successfully demonstrated. (C) 2000 Elsevier Scien ce S.A. All rights reserved.