QUANTITATIVE ANALYSIS OF GAS NON-SELECTIVE GAS SENSORS MIXTURES WITH

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-recogni-tion 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 CH4 with a sensor array of commercially available SnOz 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. 1