APPLICATION OF PATTERN-RECOGNITION AND PIEZOELECTRIC SENSOR ARRAY FORTHE DETECTION OF ORGANIC-COMPOUNDS

Organic vapours were measured by an array of piezoelectric crystal det ectors. Quartz crystals were coated by different GC stationary phases. Four coated crystals were placed in an array and pattern recognition was used for identification of the compounds including acetone, benzen e, chloroform and pentane. A computer program was developed for the me asurement of the frequency changes and data processing. Pattern recogn ition method using feature extraction was applied for identification o f analytes.