【英文标准名称】:StandardTestMethodforReflectanceFactorandColorbySpectrophotometryUsingHemisphericalGeometry
【原文标准名称】:用半球体几何形状的分光光度法测量反射系数和颜色的标准试验方法
【标准号】:ASTME1331-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E12.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:color;hemisphericalgeometry;reflectance;reflectancefactor;spectrophotometry;Color--opaquematerials;Colorimetricanalysis;Geometricanalysis--paints/relatedcoatings/materials;Hemisphericalgeometry;Instrumentalmeasurement--color/light;Reflec
【摘要】:Themostdirectandaccessiblemethodsforobtainingthecolorcoordinatesofobjectcolorsarebyinstrumentalmeasurementusingspectrophotometersorcolorimeterswitheitherhemisphericalorbidirectionalopticalmeasuringsystems.Thistestmethodprovidesproceduresforsuchmeasurementbyreflectancespectrophotometryusingahemisphericalopticalmeasuringsystem.Thistestmethodisespeciallysuitableformeasurementofthefollowingtypesofspecimensfortheindicateduses(GuideE179andPracticeE805):Alltypesofobject-colorspecimenstoobtaindataforuseincomputercolorantformulation.Object-colorspecimensforcolorassessment.Forthemeasurementofplane-surfacehigh-glossspecimens,thespecularcomponentshouldgenerallybeexcludedduringthemeasurement.Forthemeasurementofplane-surfaceintermediate-glossspecimensandoftextured-surfacespecimens,includingtextiles,wherethefirst-surfacereflectioncomponentmaybedistributedoverawiderangeofangles,measurementmaybemadewiththespecularcomponentincluded,buttheresultingcolorcoordinatesmaynotcorrelatebestwithvisualjudgmentsofthecolor.Theuseofbidirectionalgeometry,suchas45/0or0/45,mayleadtobettercorrelations.Forthemeasurementofplane-surface,low-gloss(matte)specimens,thespecularcomponentmayeitherbeexcludedorincluded,asnosignificantdifferenceintheresultsshouldbeapparent.Specimenswithbaremetalsurfacesforcolorassessment.Forthisapplication,thespecularcomponentshouldgenerallybeincludedduringthemeasurement.Thistestmethodisnotrecommendedformeasurementofthefollowingtypesofspecimens,forwhichtheuseofbidirectionalmeasurementgeometry(0/45or45/0)ispreferable(GuideE179):Object-colorspecimensofintermediategloss,Retroreflectivespecimens,andFluorescentspecimens(PracticeE991).Whenthereisdoubtastowhetherthespecularcomponentofreflectionshouldbeincludedorexcluded,bothmeasurementsshouldbemade,andtheresultscorrelatedwithvisualjudgments.Thereafter,themethodwithhighervisualcorrelationshouldbeutilized.Whenmeasurementsoftwospecimenswhosegloss,ortexture,aresubstantiallydifferentfromeachother,aretobeutilizedinacolor-differencecomparison,generallythespecularcomponentshouldbeincludedineachmeasurement.Thishastheeffectofincludinginbothmeasurementsallthefirstsurfacereflectionswhetherdiffuseorspecular.Thesefirstsurfacereflectionsaresubtractedfromeachotherinthecolor-differenceequation,anddifferencesinthebodycolorremain,whichiswhatisusuallysought.1.1Thistestmethoddescribestheinstrumentalmeasurementofthereflectionpropertiesandcolorofobject-colorspecimensbytheuseofaspectrophotometerorspectrocolorimeterwithahemisphericalopticalmeasuringsystem,suchasanintegratingsphere.1.2Thetestmethodissuitableforusewithmostobject-colorspecimens.However,itshouldnotbeusedforretroreflectivespecimensorforfluorescentspecimenswhenhighestaccuracyisdesired.Specimenshavingintermediate-glosssurfacesshouldpreferablynotbemeasuredbyuseofthisgeometry.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesn......
【中国标准分类号】:A26
【国际标准分类号】:17_180_20
【页数】:4P.;A4
【正文语种】:英语