Introduction to Eddy Current

《Introduction to Eddy Current》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、EddyCurrentTesting-AnIntroduction2014-NovemberMyASNTLevelIIIPre-ExamPreparatorySelfStudyNotesCharlieChong/FionZhangCharlieChong/FionZhanghttps://www.nde-ed.org/EducationResources/CommunityCollege/EddyCurrents/Graphics/Flash/DifferentialvsAbsoluteAnim.sw

2、fCharlieChong/FionZhangFionZhang2014/Novemberhttp://meilishouxihu.blog.163.com/Shanghai上海CharlieChong/FionZhangShanghai上海CharlieChong/FionZhangShanghai上海CharlieChong/FionZhangGreekletterCharlieChong/FionZhang看不了”YouTube”学习视频.我是一个聪明的梯子,用来干什么你懂的CharlieCho

3、ng/FionZhang我是一个聪明的猴子CharlieChong/FionZhanghttp://v.qq.com/cover/u/ujnamwpqg1xg8qm/y0012j6s11e.htmlOffshoreInstallationsCharlieChong/FionZhangOffshoreInstallationsCharlieChong/FionZhangETExpertatWorksCharlieChong/FionZhanghttp://ropax.co.uk/eddy-current

4、-inspection.htmlExpertatWorksCharlieChong/FionZhangETExpertatWorksCharlieChong/FionZhangContents1.Introduction2.ThePhysics3.Instrumentation4.Probes(Coils)5.ProceduresIssues6.Applications7.AdvancedTechniques8.QuizzesCharlieChong/FionZhang1.0Introduction1

5、.1BasicPrinciplesofEddyCurrentInspectionEddycurrentinspectionisoneofseveralNDTmethodsthatusetheprincipalof“electromagnetism”asthebasisforconductingexaminations.SeveralothermethodssuchasRemoteFieldTesting(RFT),FluxLeakageandBarkhausenNoisealsousethisprin

6、ciple.Eddycurrentsarecreatedthroughaprocesscalledelectromagneticinduction.Whenalternatingcurrentisappliedtotheconductor,suchascopperwire,amagneticfielddevelopsinandaroundtheconductor.Thismagneticfieldexpandsasthealternatingcurrentrisestomaximumandcollap

7、sesasthecurrentisreducedtozero.Ifanotherelectricalconductorisbroughtintothecloseproximitytothischangingmagneticfield,currentwillbeinducedinthissecondconductor.Eddycurrentsareinducedelectricalcurrentsthatflowinacircularpath.Theygettheirnamefrom“eddies”th

8、atareformedwhenaliquidorgasflowsinacircularpatharoundobstacleswhenconditionsareright.CharlieChong/FionZhangEddycurrent-SurfaceprobeCharlieChong/FionZhanghttp://criterionndt.com/eddy-current-testing/eddy-current-theoryEddycurrent-