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26320128JOURNALOFSHANDONGPOLYTECHNICUNIVERSITYVol．26No．3Aug．20122012-04-122008BSBO1001．1986-．1004-4280201203-0056-03250353。。。TP13AResearchAndApplicationOfTheUltrasonicTransducerMENGYan-qingSchoolofElectricalEngineeringandAutomationShandongPolytechnicUniversityJinan250353ChinaAbstractUltrasonictransducerisproducedbypiezoelectricmaterialsanditcandetectsomecharacteristicsofatargetmediabytransmittingacertainfrequencyofultrasonicsignalsandreceivingthesignalcontaininginformationofthemedia．Thespecialpropertiesofpiezoelectricceramicdeterminethattheultrasonictransducerwillbewidelyused．Thispapermainlystudiesthecharacteristicsofthepiezoelectricceramictheparametersandequivalentcircuitofthetransducerperformanceandtheapplicationinliquidconcentrationdetectionwiththetransducer．Keywordspiezoelectricceramictransducerconcentrationdetection1、、、。、。、、。。。。1。。。22．1。3。。PbTiO3。theCurietemperature。2。1。12．22．2．11。2。。3t=λL2=cL2f0tλLcLf0。N=tf0=cL2N3。2．2．2。1。1D33G33D3310－12m/v62G3310－3v·m/N34D33G334。2。2KRZminFS。KRZ5min。2．32．3．1——。。3。32．3．27526。105。4。4C0R0。R0。R1R2。3。5。5Spartan3EFPGA。。。。ADC。。。4。。。1．J．2006252161-163．2．J．199214337-39．3．J．2009383141-144．4．D．2005．5．D．2006．85