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Computer controlled Kelvin probe for olfactory images

Ress S.

Electron Technology

2000

Vol. 33, No. 1/2

302-305

The vibrating capacitor method is a sensitive, contactless and easy-to-realize measurement method for determining the contact potential difference (CDP) between two surfaces. This method can be used for creating olfactory images for selective gas analysis by measuring the adsorption-induced work function changes of a sensor layer. The gas adsorption depends both on the surface material and the temperature. Therefore using an array of different materials on an asymmetrically heated substrate can be considered as a sensor matrix with defferent sensor characteristics at the points of different material and temperature.