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【英文标准名称】:StandardTestMethodforMeasuringAngularDisplacementofMultipleImagesinTransparentParts
【原文标准名称】:测定透明部件中的多重图像的角位移的标准试验方法
【标准号】:ASTMF1165-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:aircrafttransparency;angulardisplacement;canopy;primaryimage;secondaryimage;transparentparts;windscreen;Aerospacetransparentenclosures;Angulardeviation;Displacement;Fieldtesting--aerospacematerials/applications;Imageanalysis--a
【摘要】:Withtheadventofthick,highlyangledaircrafttransparencies,multipleimaginghasbeenmorefrequentlycitedasanopticalproblembypilots.Secondaryimages(ofoutsidelights),oftenvaryinginintensityanddisplacementacrossthewindscreen,cangivethepilotdeceptiveopticalcuesofhisaltitude,velocity,andapproachangle,increasinghisvisualworkload.Currentspecificationsformultipleimagingintransparenciesarevagueandnotquantitative.Typicalspecificationsstatex201C;multipleimagingshallnotbeobjectionable.x201D;Theangularseparationofthesecondaryandprimaryimageshasbeenshowntorelatetothepilot''sacceptabilityofthewindscreen.Thisprocedureprovidesawaytoquantifyangularseparationsoamoreobjectiveevaluationofthetransparencycanbemade.Itmaybeusedforresearchofmultipleimaging,quantifyingaircrewcomplaints,orasthebasisforwindscreenspecifications.Itshouldbenotedthatthebasicmultipleimagingcharacteristicsofawindscreenaredeterminedearlyinthedesignphaseandarevirtuallyimpossibletochangeafterthewindscreenhasbeenmanufactured.Infact,aperfectlymanufacturedwindscreenhassomemultipleimaging.Foraparticularwindscreen,cautionshouldbetakenintheselectionofspecificationcriteriaformultipleimaging,astheinherentmultipleimagingcharacteristicsmayvarysignificantlydependinguponwindscreenthickness,material,orinstallationangle.Anytolerancesthatmightbeestablishedshouldallowforinherentmultipleimagingcharacteristics.1.1Thistestmethodcoversmeasuringtheangularseparationofsecondaryimagesfromtheirrespectiveprimaryimagesasviewedfromthedesigneyepositionofanaircrafttransparency.Angularseparationismeasuredat49pointswithina20by20x00B0;fieldofview.Thisproceduremaybeperformedonanyaircrafttransparencyinalaboratoryorinthefield.However,theprocedureislimitedtoadarkenvironment.Laboratorymeasurementsaredoneinadarkenedroomandfieldmeasurementsaredoneatnight.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.2.1Exception8212;Thevaluesinparenthesesareforinformationonly.1.3Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A42
【国际标准分类号】:17_180_01
【页数】:4P.;A4
【正文语种】:英语