Designation:E1781/E1781M−13StandardPracticeforSecondaryCalibrationofAcousticEmissionSensors1ThisstandardisissuedunderthefixeddesignationE1781/E1781M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversrequirementsforthesecondarycalibrationofacousticemission(AE)sensors.Thesecondarycalibrationyieldsthefrequencyresponseofasensortowavesofthetypenormallyencounteredinacousticemissionwork.Thesourceproducingthesignalusedforthecalibrationismountedonthesamesurfaceofthetestblockasthesensorundertesting(SUT).Rayleighwavesaredominantundertheseconditions;thecalibrationresultsrepresentprimarilythesen-sor’ssensitivitytoRayleighwaves.Thesensitivityofthesensorisdeterminedforexcitationwithintherangeof100kHzto1MHz.Sensitivityvaluesareusuallydeterminedatfrequen-ciesapproximately10kHzapart.Theunitsofthecalibrationarevoltsperunitofmechanicalinput(displacement,velocity,oracceleration).1.2Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandards.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E114PracticeforUltrasonicPulse-EchoStraight-BeamContactTestingE494PracticeforMeasuringUltrasonicVelocityinMateri-alsE1106TestMethodforPrimaryCalibrationofAcousticEmissionSensorsE1316TerminologyforNondestructiveExaminations3.Terminology3.1Definitions—RefertoTerminologyE1316,SectionB,fortermsusedinthispractice.3.2DefinitionsofTermsSpecificto...
