BS EN 14096-2-2003 Non-destructive testing - Qualification of radiographic film digitisation systems - Minimum requirements《无损检验 X射线照相胶片数字化系统的质量鉴定 最低要求》.pdf

1、BRITISH STANDARD BS EN 14096-2:2003 Non-destructive testing Qualification of radiographic film digitisation systems Part 2: Minimum requirements The European Standard EN 14096-2:2003 has the status of a British Standard ICS 19.100; 37.040.25 BSEN 14096-2:2003 This British Standard was published unde

2、r the authority of the Standards Policy and Strategy Committee on 7 May 2003 BSI 7 May 2003 ISBN 0 580 41788 3 National foreword This British Standard is the official English language version of EN 14096-2:2003. The UK participation in its preparation was entrusted to Technical Committee Wee/46, Non

3、-destructive testing, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI

4、 Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for i

5、ts correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK intere

6、sts informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the d

7、ocument was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN140962 April2003 ICS19.100;37.040.25 Englishversion NondestructivetestingQualificationofradiographicfilm digitisationsystemsPart2:Minimumrequirements Essaisnondestructi

8、fsQualificationdessystmesde numrisationdesfilmsradiographiquesPartie2: Exigencesminimales ZerstrungsfreiePrfungQualifizierungvonRntgenfilm DigitalisierungssystemenTeil2:Mindestanforderungen ThisEuropeanStandardwasapprovedbyCENon14February2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegu

9、lationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversio

10、ns(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Gr

11、eece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploita

12、tioninanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN140962:2003EEN140962:2003(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Digitisationqualityclasses .6 5 Minimumrequirementsforfilmdigitisationqualityclasses .6EN140962:2003(E) 3 F

13、oreword Thisdocument(EN140962:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC138,“Nondestructive testing“,thesecretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyOctober2003,andconflictingnation

14、alstandardsshallbewithdrawnatthelatest byOctober2003. EN14096comprisesaseriesofEuropeanStandardsforradiographicfilmdigitisationsystemswhichismadeupof thefollowing: EN140961 Nondestructive testing Qualification of radiographic film digitisation systems Part1: Definitions,quantitativemeasurementsofima

15、gequalityparameters,standardreferencefilmand qualitativecontrol EN140962 Nondestructive testing Qualification of radiographic film digitisation systems Part2: Minimumrequirements AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplement

16、thisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN140962:2003(E) 4 Introduction Radiographicfilmsystemsareusedforindustrialinspec

17、tionbyXandgammarays.Toapplymodernmeansof computersupportforanalysis,transmissionandstoragetheinformationstoredintheradiographicfilmshouldbe convertedintodigitaldata(digitisation).ThisEuropeanStandarddefinesminimumrequirementstoensurethatthe relevantinformationforevaluationofthedigitaldataispreserved

18、duringthefilmdigitisationprocess. 1Scope ThisEuropeanStandardspecifiesthreefilmdigitisationqualityclassesfortherequirementsofnondestructive testing.Theselectedclassdependsontheradiationenergy,penetratedmaterialthicknessandthequalitylevelof theoriginalradiographicfilm.ThisEuropeanStandarddoesnotaddre

19、sssignalprocessing,displayandstorageof thedigitiseddata. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequen

20、tamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN444, NondestructivetestingGeneralprinciplesforradiographicexaminationofmetallicmate

21、rialsbyXand gammarays. EN1435, NondestructiveexaminationofweldsRadiographicexaminationofweldedjoints. EN12681, FoundingRadiographicexamination. EN140961:2003,Nondestructivetesting Qualificationofradiographicfilmdigitisationsystems Part 1: Definitions,quantitativemeasurementsofimagequalityparameters,

22、standardreferencefilmandqualitativecontrol. ISO5579, NondestructivetestingRadiographicexaminationofmetallicmaterialsbyXandgammarays Basicrules. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 radiographicfilmdigitisationsystem digitiser sequential

23、applicationofthetwofunctionsbelow: a) detectionofthediffusetransmittanceofasmallunitareaofthefilm(pixel,pictureelement)bymeansofan opticaldetector,givinganelectricoutputsignal(geometricaldigitisation); b) conversionoftheaboveelectricalsignalintoanumericalvalue(densitometricaldigitisation)EN140962:20

24、03(E) 5 3.2 pixelsize P geometricalcentretocentredistancebetweenadjacentpixelsinarow(horizontalpitch)orcolumn(verticalpitch) ofthescannedimage 3.3 opticaldensity D logarithmicvaluetothebase10ofthediffuselightintensityratioinfrontof( I 0 )andbehind( I D )theradiographicfilm accordingtoequation(1): D

25、I I D 0 lg (1) 3.4 spatialfrequency f describedbyasinusoidalintensityvariationalongageometricalaxis Theperiodofthisfunctionismeasuredinnumberoflinepairspermillimetre(lp/mm). 3.5 modulationtransferfunction MTF normalisedmagnitudeoftheFouriertransform(FT)ofthedifferentiatedspatialopticaldensityedgespr

26、ead function(ESF)(seeEN140961:2003,Figure1) Itdescribestheunsharpnessfunctionofthedigitiser(contrasttransmissionasafunctionoftheobjectsize). NOTE ThisMTFcalculationisbasedonopticaldensities,whichcorrespondtotheXraydose. 3.6 digitalresolution inbit numberofbitsprovidedbytheanaloguetodigitalconvertero

27、fthedigitiserusedfordensitometricaldigitisation NOTE AdigitalresolutionofNbitscorrespondsto2 N digitalvalues. 3.7 densitycontrastsensitivity D CS minimumdensityvariationofthefilm,whichisresolvedbythedigitiser Thisismostlydeterminedbythedigitisationnoiseofthedigitise(quantumnoiseofthelightdetector).

28、NOTE ThedeterminationofthisvalueisdescribedinEN140962:2003,4.1.5. 3.8 densityrange D R rangeofmaximumandminimumopticaldensities,whichcanbemeasuredbythedigitiser Dependingontheconstructionofthedigitiser,thisdensityrangecanbesplitintoseveralworkingranges(e.g.bya differentilluminationpowerand/oradiffer

29、entdetectorintegrationtime). 3.9 workingrange D WR rangeofopticaldensities,wherethedigitiserguaranteesaminimumdensitycontrastsensitivityinonesingle acquisitionEN140962:2003(E) 6 Onlyinthisworkingrangethedigitiseddatacanbeusedforevaluation.Dependingonthedigitiserconstruction therecanbemorethanonework

30、ingrange,e.g.forbrighterordarkerfilms. 4 Digitisationqualityclasses Allradiographicfilmdigitisationsystemsaresubdividedinto3qualityclassesDS,DBandDA: DS theenhancedtechniquewhichperformsthedigitisationwithaninsignificantreductionofsignaltonoise ratioandspatialresolution. Applicationfield :digitalarc

31、hivingoffilms(digitalstorage). DB theenhancedtechnique,whichpermitssomereductionofimagequality. Applicationfield :digitalanalysisoffilms,originalradiographicfilmshavetobearchived. DA thebasictechnique,whichpermitssomereductionofimagequalityandfurtherreducedspatialresolution. Applicationfield :digita

32、lanalysisoffilms,originalradiographicfilmshavetobearchived. EachradiographicfilmdigitisationsystemforNDTapplicationsshallbeidentifiedwithallworkingrangesofoptical densities.ItshallbeclassifiedbythequalityclasscorrespondingtoTable1andthemaximumMTF20%value, correspondingtoEN140961,whichcanbeperformedb

33、ythissystem. EXAMPLE AdigitisationsystemofclassDS4,2(scannerclassDS(seeTable1),maximumMTF20%=4,2lp/mm(see Table2)canbeappliedforarchivingofradiographstakenwithXraysabove200keVor raysandcanbeappliedforallclass DBandDAdigitisationtasks. 5 Minimumrequirementsforfilmdigitisationqualityclasses 5.1 Densit

34、yrangeandworkingrangesofthefilmdigitisationsystem Table1definestheminimumdensityrangeoftheradiographicdigitisationsystem.Inthisdensityrangethe digitisershallprovideadensitycontrastsensitivity D CS with D CS 0,02.Dependingontheconstructionofthe digitiser,thisdensityrangecanbesplitintoseveralworkingra

35、nges. Theminimumdigitalresolutionisgivenfordevicesconvertingthedigitalvalueproportionaltotheopticaldensity.If thedigitalvalueisconvertedproportionaltothelightintensity,thedigitalresolutionhastobeincreasedatleastby 2additionalbits. Table1Minimumdensityrangeoftheradiographicdigitisationsystemwithamini

36、mumdensitycontrast sensitivity Parameter ClassDS ClassDB ClassDA Densityrange a D R 0,5to4,5 0,5to4,0 0,5to3,5 Digitalresolutioninbit 12 10 10 Densitycontrastsensitivity D CS within D R 0,02 0,02 0,02 a Thisdensityrangemaybesplittedintoseparatedworkingranges. 5.2 Minimumspatialresolutionoffilmdigiti

37、sationsystems DuetotheenergydependenceoftheinherentunsharpnessofindustrialXrayfilmsystemsthefollowing parameters(seeTable2)shallbeobserved:EN140962:2003(E) 7 Table2Minimumspatialresolutionoffilmdigitisationsystems Energy ClassDS ClassDB ClassDA keV Pixelsize m MTF20% lp/mm Pixelsize m MTF20% lp/mm P

38、ixelsize m MTF20% lp/mm 100 15 16,7 50 5 70 3,6 100to200 30 8,3 70 3,6 85 3 200to450, Se75,Yb169 60 4,2 85 3 100 2,5 Ir192 100 2,5 125 2 150 1,7 Co60,1MeV 200 1,25 250 1 250 1 NOTE1 ForthenormalcheckcorrespondingtoEN140961,theMTF20%valuecanbedeterminedbytheconverging spatialresolutiontargets. NOTE 2

39、 Duetopossiblealiasing,theconvergingspatialresolutiontargetscangivelessaccuratevaluesthanMTF measurements. NOTE3 For energies lower than70keV the spatial resolution of the radiographic film can be better than the scanner resolutionrequiredbytheclassDS16,7.Inthiscasethespatialresolutionofthescannersh

40、ouldbeadaptedtothefilm resolution,ortheoriginalradiographicfilmshouldbearchived. 5.3 Digitisationclassdependingontheradiographictestingclass ThestandardsISO 5579,EN 444,EN 1435orEN 12681definetworadiographictestingclassesAandB. Radiographstakenaccordingtothesestandardsshallbedigitisedcorrespondingto

41、Table3. Table3MinimumdigitisationclassdependingontheradiographictestingclassesAandB,if radiographsaretakenonthebasisofISO5579,EN444,EN1435orEN12681 wallthicknessmm steel ClassDS ClassDB ClassDA 5 B A 5 BBA NOTE ForthedetectionofcracksandfineimperfectionsClassDBorbettershouldbeused. Afterdigitisation

42、processallrequiredimagequalityindicatorsshallbevisibleinthedigitalimageasontheoriginal radiographicfilm.BS EN 14096-2:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK v

43、iew on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve

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