Investigations of Multi-Element Gas Sensing Systems
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| Veröffentlicht in: | PQDT - Global (1992) |
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| Abstract: | Characterisation of a multi-element conducting polymer-based gas sensor array has been achieved. Various factors have been investigated. These include temperature, relative humidity, degradation, and polymer sensitivity to chemical volatile's concentrations Early findings from these investigations show linear response curves for sensitivity, degradation, and negative resistance changes with temperature. Water-polymer adsorption follows a Langmuir adsorption isotherm; whereas, polymer's sensitivity to chemical volatiles decayed exponentially with relative humidity. Several models have been derived which describe these behaviours. Based on these models, a compensation algorithm has been developed which removes the effects of the unwanted signals, leaving only the desired signal. A Partial Least-Squares-based programme has been developed to identify and quantify chemical volatiles. Five chemical volatiles have been identified and their concentrations have been accurately predicted. |
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| ISBN: | 9798352902271 |
| Quelle: | ProQuest Dissertations & Theses Global |