2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:E1065E1065M?14StardPracticefEvaluatingacteristicsofUltrasonicSearchUnits1ThisstardisissuedunderthefixeddesignationE1065E1065Mthenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecas

2、eofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thispracticecoversmeasurementproceduresfevaluatingcert

3、ainacteristicsofultrasonicsearchunits(alsoknownas“probes”)thatareusedwithultrasonictestinginstrumentation.Thispracticedescribesmeansfobtainingperfmancedatathatmaybeusedtodefinetheacousticelectricresponsesofultrasonicsear

4、chunits.1.2Theproceduresaredesignedtomeasuresearchunitsasindividualcomponents(separatefromtheultrasonictestinstrument)usingcommercialsearchunitacterizationsystemsusinglabatyinstrumentssuchassignalgeneratspulsersamplifier

5、soscilloscopeswavefmanalyzers.1.3Theproceduresareapplicabletomanufacturingacceptanceincominginspectionofnewsearchunitstoperiodicperfmanceevaluationofsearchunitsthroughouttheirservicelife.1.4TheproceduresinAnnexA1–AnnexA6

6、aregenerallyapplicabletoultrasonicsearchunitsoperatingwithinthe0.4to10MHzrange.AnnexA7isapplicabletohigherfrequencyimmersionsearchunitevaluation.AnnexA8describesapracticefmeasuringsoundbeamprofilesinmetalsfromcontactstra

7、ightbeamsearchunits.AdditionalAnnexessuchassoundbeamprofilingfanglebeamsearchunitsinmetalalternatemeansfsearchunitacterizationwillbeaddedwhendeveloped.1.5ThevaluesstatedineitherSIunitsinchpoundunitsaretoberegardedseparat

8、elyasstard.Thevaluesstatedineachsystemmaynotbeexactequivalentstherefeeachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconfmancewiththestard.1.6Thisstarddoesnotpurpttoaddressallof

9、thesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2E1

10、316TerminologyfNondestructiveExaminations2.2OtherDocument:StardMethodsfTestingSingleElementPulseEchoUltrasonicTransducers33.Terminology3.1Definitions—FdefinitionsoftermsusedinthispracticeseeTerminologyE1316.3.2Definition

11、sofTermsSpecifictoThisStard:3.2.1aperture—thedimension(s)oftheactiveareaofthepiezoelectricelementofthesearchunitasestablishedbyexperimentation.3.2.2bwidth(BW)—thatptionofthefrequencyresponsethatfallswithingivenlimits.Int

12、histextthelimitsusedarethe6dBlevelasmeasuredfromthepeakofthefrequencyresponse.TheequationusedfBWis:BW5~fu2f1!fc3100(1)where:fu=upperfrequencyf1=lowerfrequencyfc=centerfrequency.Bwidthisexpressedasapercentage.3.2.3centerf

13、requency(fc)—thefrequencyvaluecalculatedtobeatthecenterofthebwidthlimits.3.2.4depthoffield(FD)—asmeasuredontheonaxisprofileofafocusedsearchunitthatptionofthesoundbeamthatfallswithingivenlimits.3.2.5focallength(FL)—ffocus

14、edsearchunitsthedistancefromthelenstothefocalpoint.3.2.6focalpoint(Fp)—ffocusedsearchunitsthepointalongtheacousticaxisofthebeaminwateratwhichthepeak(maximum)pulseechoamplituderesponseisrecdedfromaballtargetreflect.1Thisp

15、racticeisunderthejurisdictionofASTMCommitteeE07onNondestructiveTestingisthedirectresponsibilityofSubcommitteeE07.06onUltrasonicMethod.CurrenteditionapprovedJan.12014.PublishedFebruary2014.iginallyapprovedin1985.Lastprevi

16、ouseditionapprovedin2008asE1065–08.DOI:10.1520E1065_E1065M14.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageonthe

17、ASTMwebsite.3AvailablefromtheAmericanInstituteofUltrasonicsinMedicine14750SweitzerLaneSuite100LaurelMD207075906.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestCo

18、nshohockenPA194282959.UnitedStates15.3Implementationmayrequiremedetailedproceduralinstructionsinafmatoftheusingfacility.5.4Themeasurementdataobtainedmaybeemployedbyusersofthispracticetospecifydescribeprovideaperfmancecri

19、teriafprocurementqualityassuranceserviceevaluationoftheoperatingacteristicsofultrasonicsearchunits.Allptionsofthepracticemaybeusedasdeterminedbytheuser.5.5Themeasurementsaremadeprimarilyunderpulseechoconditions.Todetermi

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