Abstract
The selectivity of gas-sensor systems is improved by the use of a sensor array (consisting of non-selective and non-linear sensor elements) combined with the application of data-transformation and subsequent pattern-recognition methods. This process is described. As an example, a quantitative gas analysis is presented, based upon the measurement of a gas mixture containing CO and CH 4 with a sensor array of commercially available SnO 2 gas sensors. The cross-sensitivity of different sensor arrays, differing in their number of sensor elements, evaluated by our method, is compared with the cross-sensitivity of a single sensor element.
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