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| Discrimination of LongJing green-tea grade by ele | ||||||||||||
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| AninvestigationwasmadetoevaluatethecapacityofanelectronicnoseE-nose,PEN2toclassifytheteaqualitygrade.FourteagroupsA120,A280,A380andA600withadifferentqualitygradewereemployed.Intheexperiment,thevolumeofvialandtheheadspacegeneratedtimewereconsideredcorrespondingtothe5gteasamples,andtheoptimumexperimentalprocedurewasdeterminedbyusingthevarianceanalysisANOVA,m*rianceanalysisandprinciplecomponentsanalysisPCA.Theresultsshowedthatthevolumeofvialaffectedtheresultofdiscrimination,andtheheadspacegeneratedtimehadnosigni?canteffectontheE-noseresponse.ThefourteagroupsweremeasuredandresponsevaluesatfourdifferentcollectiontimeswereconductedbyPCA,lineardiscriminationanalysisLDAandarti?cialneuralnetworkANN.OnlyA120,A380andA600couldbediscriminatedbyPCA.However,thefourteagroupswerediscriminatedcompleybyLDA.TheresponsevalueoftheE-noseat60swasoptimumtobeusedfordiscrimination.ThemethodofANNnetworktopology20-12-4wasperformedand90%oftheotalteasampleswereclassi?edcorrectlybyusingtheback-propagationneuralnetwork.?2006ElsevierB.V.Allrightsreserved. |
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