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【英文标准名称】:StandardTestMethodforMeasuringOpticalReflectivityofTransparentMaterials
【原文标准名称】:测量透明材料光反射率的试验方法
【标准号】:ASTMF1252-2008
【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】:F07.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Aerospacetransparentenclosures;Instrumentalmeasurement;Lightexposure;Luminance;Opticalmaterials/properties/tests--aerospacematerials;Photometry;Reflectanceandreflectivity;Spectraldata
【摘要】:Reflectionsfromaircrafttransparenciesofinstrumentlightsandothercockpitobjectshavebeenaconcerntomanypilots.Attemptstoreducethesereflectionshavebeenhamperedbythelackofarepeatablemeasurementmethodandvariancesinreflectionmeasuringinstrumentation.Theproblemwithmeasuringinstrumentationisthatdifferentbrandswilloftengivesignificantvaluedifferencesusingthesamespecimensurface.Thistestmethodreducestheinstrumentvariationsbystandardizingthelightsource,calculationmethod,andareaofspecimensurfacebeingmeasured;abrandofinstrumentationisnotspecified.Sincethereflectivityisdefinedastheratiooftwoluminancemeasurementsanddoesnotdependonanabsolutemeasurement,dependenceupontheaccuracyofthemeasuringinstrumentisreduced.Thetestmethodmaybeusedtoobjectivelycomparethereflectioncharacteristicsofvarioustransparentmaterials.Furthermore,thetestmethodmaybeusedtoevaluatereflectionsofaspecifiedspectralsourcebyusingthatsourceinplaceofthestandardlightsource.Provisionsaremadetocheckforpolarizationeffectsofthesampleandtorecordthereflectivityofastandardspecimen.Theseprovisionsareofferedasanoptiontothetester;itisuptotheuserortherequiringagencytodeterminethesignificanceanduseofthesedata.Sincethereflectionsaremeasuredphotopically,theresultsarerepresentativeofwhatthepilotwouldvisuallyperceive.1.1Thistestmethodcoversaprocedureformeasuringthereflectivityoftransparentmaterials,hereafterknownasspecimens.Theresultsarerepeatablewithoutspecifyingaparticularbrandnameofinstrumentation.1.2Thistestmethodappliestosubstantiallyflatparts.Errorsinmeasurementcanoccurifthepartsbeingmeasuredarenotsubstantiallyflat.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A60
【国际标准分类号】:17_180_20
【页数】:4P.;A4
【正文语种】:英语