Eddy Current Maths

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1、ElectromagneticTesting-EddyCurrentMathematics2014-DecemberMyASNTLevelIIIPre-ExamPreparatorySelfStudyNotes外围学习中CharlieChong/FionZhangCharlieChong/FionZhangFionZhangatShanghai2014/Novemberhttp://meilishouxihu.blog.163.com/Shanghai上海CharlieChong/FionZhangImpedancePhaso

2、lDiagramsCharlieChong/FionZhangImpedancePhasolDiagramsCharlieChong/FionZhangCharlieChong/FionZhangCharlieChong/FionZhangCharlieChong/FionZhangGreekletterCharlieChong/FionZhangEddyCurrentInspectionFormulaCharlieChong/FionZhanghttps://www.nde-ed.org/GeneralResources/F

3、ormula/ECFormula/ECFormula.htmCharlieChong/FionZhanghttps://www.nde-ed.org/GeneralResources/Formula/ECFormula/ECFormula.htmCharlieChong/FionZhanghttps://www.nde-ed.org/GeneralResources/Formula/ECFormula/ECFormula.htmCharlieChong/FionZhanghttps://www.nde-ed.org/Gener

4、alResources/Formula/ECFormula/ECFormula.htmCharlieChong/FionZhanghttps://www.nde-ed.org/GeneralResources/Formula/ECFormula/ECFormula.htmUnitsCharlieChong/FionZhangOhmsLaw:AccordingtoOhmsLaw,thevoltageistheproductofcurrentandresistance.V=IxRWhereV=Voltageinvolts,I=Cu

5、rrentinAmpsandR=ResistanceinOhmsInductanceofasolenoidisgivenby:L=μN2A/lohttps://en.wikipedia.org/wiki/InductanceCharlieChong/FionZhangPhaseAngleandImpedancePhaseangleisexpressedasfollows:tanΦ=X/RLWhere:Φ=PhaseAngleindegrees,X=InductiveReactanceinohmsandR=LResistance

6、inohms.Impedanceisdefinedasfollows:WhereZ=Impedanceinohms,R=ResistanceinohmsandX=ReactanceLinohms.CharlieChong/FionZhangMagneticPermeabilityandRelativeMagneticPermeabilityMagneticpermeabilityistheratiobetweenmagneticfluxdensityandmagnetizingforce.μ=B/HWhereμ=Magneti

7、cPermeabilityinHenriespermeter(mu),B=MagneticFluxDensityinTesla,H=MagnetizingForceinAmps/meter.Relativemagneticpermeabilityisexpressedasfollows:μ=μ/μroWhereμ=Relativemagneticpermeability(mu)andμ=Magneticropermeabilityoffreespace(Henriespermeter=1.257*10-6).μ=1fornon

8、-rferrousmaterials.CharlieChong/FionZhangConductivityandResistivityConductivityandresistivityisrelatedasfollows:σ=1/ρWhereσ=Conductivity(s