uriertransforms(DFTs)ofsignalsViandVo(consideredasdiscrete)arecalculatedbyusingaspectrumanalyzer.Inadditiontothesimplicityofthecircuitanditslowcost,thismethodpossessesthefollowingdisadvantages:)TheimpedanceisjustanapproximationthatdependsontheresistanceRSandtendstopresentahighdiscrepancywhenthefrequencyincreasesbecausethePZTispredominantlycapacitive.)IftheresistanceRSisverysmall,thenitisnecessarytouseahigh-gainamplifier(R/R)thatcanreducethebandwidth.)Thespectrumanalyzerisstillanexpensiveinstrument.Theimpedanceanalyzerproposedin[]onlyusesaresistorasanauxiliarycircuit,andthesignalresponseacquisitionisperformedbyadataacquisition(DAQ)device,whichiscontrolledbythesoftwareLabVIEW.Italsoseemsthatitismoreaccuratethantheimpedanceanalyzersuggestedin[]and[].However,theexcitationsignalisprovidedbyanexternalfunctiongeneratorthatneedsanadditionalgeneralpurposeinterfacebuscard.InaFRF安排PZT束阻抗测量。