Equivalent circuit for broadband underwate transducer英文学习材料

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1、IEEETRANSACTIONSONULTRASONICS,FERROELECTRICS,ANDFREQUENCYCONTROL,vol.55,no.9,SEPTEMBER20082079CorrespondenceEquivalentCircuitforBroadbandplications.MarshallandBrigham[5]haveestimatedtheUnderwaterTransducersequivalentcircuitparametersoftransducerswithalowfigureofmerit.Theyhavedetermined4par

2、ametersoftheR.RameshandD.D.Ebenezerequivalentcircuitfromtheanalysisofcapacitancecurve.Sherritetal.[6]haveproposedanequivalentcircuitmodelAbstract—Amethodispresentedtodeterminetheequiva-ofapiezoelectricthickness-modevibratorandestimatedlentcircuitsofbroadbandtransducerswith2resonancesinthet

3、hecircuitparametersfromcomplexmaterialcoefficients.frequencybandofinterest.ThecircuitparametersarerefinedChurchandPincock[7]havedescribedamethodtodeter-byleast-squaresfittingthemeasuredelectricalconductanceminetheequivalentcircuitparametersofsmallacousticdatawiththismodel.Themethodisillust

4、ratedbycomputingtheconductanceandsusceptanceoftheequivalentcircuitsoftransmittersatornearresonance.However,theseanaly-3typesofbroadbandtransducersandcomparingthemwithsesarerestrictedtotransducerswithoneresonanceinthethemeasuredvalues.Theequivalentcircuitofatransducerisoperatingbandofintere

5、st.CoatesandMaguire[8]havenecessaryfordesigningfiltersthatmatchtheimpedancesofderivedapproximateexpressionsofequivalentcircuitpa-thetransducerandthepoweramplifierthatdrivesthetrans-rametersofmultiple-modetransducersfromtheelectricalducer.admittance.Thesedatacouldbeusedasstartingvaluesforsu

6、bsequentiterativerefinement.I.IntroductionInthispaper,anapproachispresentedtodeterminetheequivalentcircuitofbroadbandtransducerswitharoadbandtransducersthathavenearlyflatandBhightransmittingvoltageresponse(TVR)overonenearlyflatTVRand2resonancesintheimpedanceinthebandofinterest.Theequivalen

7、tcircuithaslumpedfre-octaveorevenmorehavebeendevelopedinrecentyearsquency-independentcomponents.Approximateequivalent[1].However,thereisconsiderablevariationintheimped-circuitparametersarefirstestimatedusing7measuredanceofthetransducerinthebandinwhichtheTVRisv