An electronic nose system for per-evaluation of vinegar quality is designed

five types of TGS series and a MQ series semiconductor oxide gas sensor construct sensor array and a collection circuit with the LPC2138 microprocessor as the core.The collected data is uploaded to a computer through USB interface and real-time displayed by using host computer LabVIEW software

and analyzed using principal component analysis（PCA）method and linear discriminant analysis（LDA）method.The designed electronic nose is used to measure five kinds of vinegar

and the correlation between vinegar types and their ingredients are analyzed.The results show that electronic nose technology is feasible in vinegar quality pre-evaluation.