非铁磁性金属材料螺旋线圈电磁超声换能器接收效率场路耦合分析

非铁磁性金属材料螺旋线圈电磁超声换能器接收效率场路耦合分析Introduction:Electromagnetic ultrasonic transducers are widely used in

非铁磁性金属材料螺旋线圈电磁超声换能器接收效率 场路耦合分析 Introduction: Electromagneticultrasonictransducersarewidelyusedin non-destructivetesting,medicaldiagnosis,andindustrial applications.Theyconvertelectricalsignalsintomechanical vibrations,whichpropagatethroughamaterialandproduce reflectedsignalsthatcanbeanalyzed.Theefficiencyofan electromagneticultrasonictransducerdependsonanumberof factors,includingthegeometryofthecoil,thematerialproperties ofthecoilandthesample,andthecouplingbetweenthecoiland thesample.Inthispaper,wewillfocusontheanalysisofthe couplingbetweenanon-magneticmetalmaterialspiralcoilanda sample,andhowitaffectstheefficiencyoftheelectromagnetic ultrasonictransducer. Theoreticalbackground: Electromagneticultrasonictransducersoperatebyinducing aneddycurrentinthesampletobetested,thendetectingthe resultingultrasonicwaves.Thisisaccomplishedusingacoilthat generatesamagneticfieldwhenanelectricalcurrentisapplied.In anon-magneticmetalmaterialspiralcoil,thismagneticfieldis notuniformandvariesinstrengthalongthelengthofthecoil. Thisnon-uniformitycanleadtopoorcouplingwiththesample, whichinturnreducestheefficiencyofthetransducer. Couplingbetweenthecoilandthesamplecanbequantified usingaparameterknownasthetransferimpedance.This parameterrepresentstheratioofthevoltageinducedinthecoil tothecurrentflowingthroughthesample.Ahightransfer impedanceindicatespoorcoupling,whilealowtransfer impedanceindicatesgoodcoupling. Fieldanalysis: Toanalyzethecouplingbetweenanon-magneticmetal materialspiralcoilandasample,afiniteelementsimulationwas performedusingtheCOMSOLMultiphysicssoftware.The simulationconsistedofanon-magneticmetalmaterialspiralcoil withadiameterof10mmandathicknessof1mm,andasample