基于电涡流效应的金属探测器的设计与分析

115201310ExperimentScienceandTechnologyVol.11No.5Oct.20133501082011－10－182012－11－17JB07169JA0918631095010MJCX0806。1978－。。。、。、。TM931Bdoi10．3969/j．issn．1672－4550．2013．05．005DesignandAnalysisofMetalDetectorBasedonEddyCurrentEffectZHENGZhongkaiJIANGXuechengLUOZhizaoDepartmentofElectronicInformationEngineeringMingjiangUniversityFuzhou350108ChinaAbstractDesigningofakindofsimplemetaldetectorbasedoneddycurrenteffectwasintroduced.Theworkingprinciplewasanalyzedandintroduced.Comparingwithothercircuitsthiscircuitissimple.Itcanworkwellwhileonlyatransistorandadualvoltagecompa-ratorchipisused.Itdoesn'tneedanyprofessionalequipmentinitsfabricationandtest.Itwasprovedbyexperimentsthatthiscircuitisverystable.Itcaneasilymadebyelectronictechnologyamateursanditisfitforundergraduatetotakepartinelectronicdesigncontestandscientificactivitiesafterschool.Keywordsmetaldetectoreddycurrentsensoroscillatingcircuit、、、、、1。2、FPGA3、4。LED。、、、、。11.1。。1I1I1I2I2=kdI1/dtI2。kρ、μ、hr5－6。f。———dI1/dt。1.2。201310。。12L1、L2ML1、L2。2CL1L2。L1L2L1。L1、C。。1。1.33。L1L1、L2M。L2L1CicL2ib。。32。4L1、L2Q1。L1L2L2L1C1Ｒ2Q1Ｒ1Q1C2、C3。3Ｒ2Q1L2Q1。Ｒ1Q1·41·115L2。Ｒ1。L2L2。L1、C1L2。L1、L2L2。LEDLEDLED。4C4。D1。Ｒ9、Ｒ8。C4D1Ｒ7、C6BBLED。ABLEDLED。4、。680kHzL12V、。、。2008C“”。1.J.2009101013－24.2.J.201011111－3.3.PICJ.200515116－20.4.J.2010248367－371.5.J.20107179－182.6.M.2003.·51·