ELEMENTS AND ARRAYS FOR GAS-MIXTURES

Solid state gas sensor devices exhibit a high sensitivity in the ppm r ange and can be applied for the detection of noxious or explosive gase s and vapours in air. Detection principles are outlined and examples f or a spectroscopical characterization of gas-surface interactions are given. An improved specificity is attained by the use of sensor arrays and a computational evaluation, e.g. by a neural network. Recent real izations of such multisensor arrangements are discussed.