【英文标准名称】:StandardGuideforEvaluatingCharacteristicsofUltrasonicSearchUnits
【原文标准名称】:评估超声波探测装置特性的标准指南
【标准号】:ASTME1065-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.06
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:aperture;bandwidth;characterization;contacttesting;depthoffield;focalpoint;frequencyresponse;immersiontesting;peakfrequency;searchunit;soundbeamprofile;timeresponse;ultrasound;Acousticemission(AE)testing;Bandwidth;
【摘要】:Thisguideisintendedtoprovidestandardizedproceduresforevaluatingultrasonicsearchunits.Itisnotintendedtodefineperformanceandacceptancecriteria,butrathertoprovidedatafromwhichsuchcriteriamaybeestablished.Theseproceduresareintendedtoevaluatethecharacteristicsofsingle-elementpiezoelectricsearchunits.Implementationmayrequiremoredetailedproceduralinstructionsinaformatoftheusingfacility.Themeasurementdataobtainedmaybeemployedbyusersofthisguidetospecify,describe,orprovideaperformancecriteriaforprocurementandqualityassurance,orserviceevaluationoftheoperatingcharacteristicsofultrasonicsearchunits.Allorportionsoftheguidemaybeusedasdeterminedbytheuser.Themeasurementsaremadeprimarilyunderpulse-echoconditions.Todeterminetherelativeperformanceofasearchunitaseitheratransmitterorareceivermayrequireadditionaltests.Whiletheseproceduresrelatetomanyofthesignificantparameters,othersthatmaybeimportantinspecificapplicationsmaynotbetreated.Thesemightincludepowerhandlingcapability,breakdownvoltage,wearpropertiesofcontactunits,radio-frequencyinterference,andthelike.Caremustbetakentoensurethatcomparablemeasurementsaremadeandthatusersoftheguidefollowsimilarprocedures.Theconditionsspecifiedorselected(ifoptional)mayaffectthetestresultsandleadtoapparentdifferences.Interpretationofsometestresults,suchastheshapeofthefrequencyresponsecurve,maybesubjective.Smallirregularitiesmaybesignificant.Interpretationofthetestresultsisbeyondthescopeofthisguide.Certainresultsobtainedusingtheproceduresoutlinedmaydifferfrommeasurementsmadewithultrasonictestinstruments.Thesedifferencesmaybeattributedtodifferencesinthenatureoftheexperimentortheelectricalcharacteristicsoftheinstrumentation.Thepulsegeneratorusedtoobtainthefrequencyresponseandtimeresponseofthesearchunitmusthavearisetime,duration,andspectralcontentsufficienttoexcitethesearchunitoveritsfullbandwidth,otherwisetimedistortionanderroneousresultsmayresult.1.1Thisguidecoversmeasurementproceduresforevaluatingcertaincharacteristicsofultrasonicsearchunits(alsoknownasx201C;transducersx201D;)thatareusedwithultrasonicexaminationinstrumentation.Thisguidedescribesmeansforobtainingperformancedatathatmaybeusedtodefinetheacousticandelectricresponsesofultrasonicsearchunits.1.2Theproceduresaredesignedtomeasuresearchunitsasindividualcomponents(separatefromtheultrasonictestinstrument)usingcommercialsearchunitcharacterizationsystemsorusinglaboratoryinstrumentssuchassignalgenerators,pulsers,amplifiers,oscilloscopes,andwaveformanalyzers.1.3Theproceduresareapplicabletomanufacturingacceptanceandincominginspectionofnewsearchunitsortoperiodicperformanceevaluationofsearchunitsthroughouttheirservicelife.1.4TheproceduresinAnnexA1-AnnexA6aregenerallyapplicabletoultrasonicsearchunitsoperatingwithinthe0.4to10MHzrange.AnnexA7isapplicabletohigherfrequencyimmersionsearchunitevaluation.AnnexA8describesaguideformeasuringsoundbeamprofilesinmetalsfromcontactstraight-beamsearchunits.AdditionalAnnexes,suchassoundbeamprofilingforangle-beamsearchunitsinmetalandalternatemeansforsearchunitcharacterization,willbeaddedwhendeveloped.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.1.6Thisstandarddoesnotpurporttoaddressallo......
【中国标准分类号】:N77
【国际标准分类号】:17_140_01
【页数】:23P.;A4
【正文语种】:英语