Designation:E1816−12StandardPracticeforUltrasonicTestingUsingElectromagneticAcousticTransducer(EMAT)Techniques1ThisstandardisissuedunderthefixeddesignationE1816;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversproceduresfortheuseofelectro-magneticacoustictransducers(EMATs)forspecificultrasonicexaminationapplications.RecommendationsaregivenforspecificapplicationsforusingEMATtechniquestodetectflawsthroughbothsurfaceandvolumetricexaminationsaswellastomeasurethickness.1.2Theseproceduresrecommendtechnicaldetailsandguidelinesforthereliableandreproducibleultrasonicdetectionofflawsandthicknessmeasurementsusingelectromagneticacoustictransducersforboththepulsingandreceivingofultrasonicwaves.TheEMATtechniquesdescribedhereincanbeusedasabasisforassessingtheserviceabilityofvariouscomponentsnondestructively,aswellasforprocesscontrolinmanufacturing.1.3Theseprocedurescovernoncontacttechniquesforcou-plingultrasonicenergyintomaterialsthroughtheuseofelectromagneticfields.Surface,Lamb,longitudinal,andshearwavemodesarediscussed.1.4TheseproceduresareintendedtodescribespecificEMATapplications.Theseproceduresareintendedforappli-cationsinwhichtheuserhasdeterminedthattheuseofEMATtechniquescanoffersubstantialbenefitsoverconventionalpiezoelectricsearchunits.ItisnotintendedthatEMATtechniquesshouldbeusedinapplicationsinwhichconven-tionaltechniquesandapplicationsoffersuperiorbenefits(refertoGuideE1774).1.5Theseproceduresareapplicabletoanymaterialinwhichacousticwavescanbeintroducedelectromagnetically.Thisincludesanymaterialthatiseitherelectricallyconductiveorferromagnetic.1.6TheproceduresoutlinedinthispracticeaddressprovenEMATtechniquesforspecificapplications;theydonotpurporttoaddresstheonlyvariationorallvariationsofEMATtechniquestoaddressthegivenapplications.La...
