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Abstract

The use of multi-sensing portable analysers is of increasing importance for many
applications. This thesis reports on the development of new portable battery-powered gas
analysers suitable for remote site monitoring that can utilise a range of Taguchi tin-oxide
sensors as detectors. Two main designs were developed and evaluated for a variety of
applications employing head-space analysis.
A portable analyser employing the TGS812 and TGS824 Taguchi gas sensors was built
in flow-through arrangements. The performance of the gas analyser was evaluated in terms of
reproducibility, stability and sensitivity and was used to determine the ethanol content in
various commercial beer and wine samples. The adsorption response mechanism of the tin-oxide
gas sensors was also investigated using the Langmuir adsorption isotherm model and
this model was validated by determining the ethanol content of beer and wine samples.
A portable, battery-powered, multi-sensor gas analyser, containing six different
Taguchi tin-oxide semiconductors was developed and evaluated. The performance of the
portable, battery-powered, multi-sensor gas analyser was evaluated in terms of stability,
sensitivity, selectivity and reproducibility. The portable multi-sensor gas analyser was used to
determine the ethanol content in various beer samples employing the Langmuir isotherm
mentioned above.
The portable battery-powered multi-sensor gas analyser mentioned above was used
together with back-propagation artificial neural networks and applied to discriminate between
beer brands, grades of olive oils, as well as the estimation of the age of olive oil samples.

Item Type:	Thesis - PhD
Authors/Creators:	Dimitrakopoulos, Lucy Tina
Keywords:	Gas detectors
Copyright Holders:	The Author
Copyright Information:	Copyright 1998 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Thesis (PhD. )--University of Tasmania, 1999. Includes bibliographical references
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