Differentiating among Gas Mixtures Using a Single Tin Oxide Gas Sensor

Faramarz Hossein-Babaei; Amir Amini; Khachik Babaians

doi:10.4028/www.scientific.net/KEM.605.189

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Differentiating among Gas Mixtures Using a Single Tin Oxide Gas Sensor
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 605Differentiating among Gas Mixtures Using a Single...

Differentiating among Gas Mixtures Using a Single Tin Oxide Gas Sensor

Abstract:

Despite all their positive features oxide-based resistive gas sensors are nonselective and respond similarly for different gas and gas mixtures. The authors have recently demonstrated that the response patterns generated by a generic tin oxide gas sensor induced by thermal shocks contain considerable amounts of information regarding the nature of the present gas. Here, the results of using a similar technique on different two-component gas mixtures are reported. The gas mixtures are (1-butanol)_x (2-butanol)_1-x, (1-propanol)_x (2-butanol)_1-x, (1-butanol)_x (1-propanol)_1-x, and (1-butanol)_0.33 (2-butanol)_0.33, (1-propanol)_0.33, each at various total concentrations. The diagnostic features of the response patterns were extracted, by applying wavelet transform, and used for their discrimination in a three dimensional feature space. The positions of the clusters related to different gases are consistent with their composition and facilitate estimating the individual concentrations of the components.