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【英文标准名称】:StandardPracticeforDeterminingRelativeImageQualityResponseofIndustrialRadiographicImagingSystems
【原文标准名称】:工业X射线照相成像系统的相关图像质量特性曲线的测定用标准实施规程
【标准号】:ASTME746-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E07.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:影片;图象质量;无损检验;摄影;质量;射线摄影胶片;测试
【英文主题词】:RelativeImageQualityIndicator;RelativeImageQualityResponse;equivalentpenetrametersensitivity;Industrialradiographicfilmprocessing/testing;Radiographicexamination;Film(radiologic/radioscopic)
【摘要】:ThisstandardprovidesapracticeforRIQRevaluationsoffilmandnon-filmimagingsystemswhenexposedthroughsteelorplasticmaterials.ThreealternatedataevaluationmethodsareprovidedinSection9.DeterminingRIQRrequiresthecomparisonofatleasttworadiographsorradiographicprocesseswherebytherelativedegreeofimagequalitydifferencemaybedeterminedusingtheEPSplaquearrangementofFig.1asarelativeimagequalityindicator(RIQI).InconjunctionwiththeRIQI,aspecifiedradiographictechniqueormethodmustbeestablishedandcarefullycontrolledforeachradiographicprocess.ThispracticeisdesignedtoallowthedeterminationofsubtlechangesinEPSthatmayarisetoradiographicimagingsystemperformancelevelsresultantfromprocessimprovements/changesorchangeofequipmentattributes.ThispracticedoesnotaddressrelativeunsharpnessofaradiographicimagingsystemasprovidedinPracticeE2002.ThecommonelementwithanyrelativecomparisonistheuseofthesameRIQIarrangementforbothprocessesunderevaluation.InadditiontothestandardevaluationmethoddescribedinSection9,theremaybeothertechniques/methodsinwhichthebasicRIQRarrangementofFig.1mightbeutilizedtoperformspecializedassessmentsofrelativeimagequalityperformance.Forexample,otherradiographicvariablescanbealteredtofacilitateevaluationsprovidedthesedifferencesareknownanddocumentedforbothprocesses.Wheremultipleradiographicprocessvariablesareevaluated,itisincumbentupontheuserofthispracticetocontrolthosenormalprocessattributestothedegreesuitablefortheapplication.SpecializedRIQRtechniquesmayalsobeusefulwithmicrofocusX-ray,isotopesourcesofradiationorwiththeuseofnon-filmradiographicimagingsystems.RIQRmayalsobeusefulinevaluatingimagingsystemswithalternatematerials(RIQIandbaseplate)suchascopper-nickeloraluminum.Whenusinganyofthesespecializedapplications,thespecificmethodortechniquesusedshallbeasspecifiedandapprovedbythecognizantengineeringauthority.1.1Thisstandardprovidesapracticewherebyindustrialradiographicimagingsystemsmaybecomparativelyassessedusingtheconceptofrelativeimagequalityresponse(RIQR).TheRIQRmethodpresentedwithinthispracticeisbasedupontheuseofequivalentpenetrametersensitivity(EPS)describedwithinPracticeE1025andsubsection5.2ofthispractice.Figure1illustratesarelativeimagequalityindicator(RIQI)thathasfourdifferentsteelplaquethicknesses(.015,.010,.008,and.005in.)sequentiallypositioned(fromtoptobottom)onax00BE;-in.thicksteelplate.Thefourplaquescontainatotalof14differentarraysofpenetrameter-typeholesizesdesignedtorendervariedconditionsofthresholdvisibilityrangingfrom1.92%EPS(atthetop)to.94%EPS(atthebottom)whenexposedtonominal200keVX-rayradiation.Eachx201C;EPSx201D;arrayconsistsof30identicalholes;thus,providingtheuserwithaquantityofthresholdsensitivitylevelssuitableforrelativeimagequalitativeresponsecomparisons.1.2Thispracticeisnotintendedtoqualifytheperformanceofaspecificradiographictechniquenorforassurancethataradiographictechniquewilldetectspecificdiscontinuitiesinaspecimenundergoingradiographicexamination.Thispracticeisnotintendedtobeusedtoclassifyorderiveperformanceclassificationcategoriesforradiographicimagingsystems.Forexample,performanceclassificationsofradiographicfilmsystemsmaybefoundwithinTestMethodE1815.1.3Thispracticecontainsanalternateprovisionwherebyindustrialradiographicimagingsystemsmaybec......
【中国标准分类号】:N78
【国际标准分类号】:37_040_25
【页数】:7P.;A4
【正文语种】: