【英文标准名称】:StandardPracticeforPreparationofPressedPowderWhiteReflectanceFactorTransferStandardsforHemisphericalandBi-DirectionalGeometries
【原文标准名称】:半球状和二维几何形状压制粉末白色反射系数转换标准的准备用标准实施规范
【标准号】:ASTME259-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:(Practice)
【标准水平】:()
【中文主题词】:验收检验;覆层;材料;光学;涂料;纸;准备;工艺;参考材料;反射;试验
【英文主题词】:bi-directionalopticalmeasuringsystem;hemisphericalopticalmeasuringsystem;integratingsphere;materialstandards;reflectanceandreflectivity;transferstandards
【摘要】:Allcommercialreflectometersmeasurerelativereflectance.Theinstrumentreadingisthereflectancefactor,theratioofthelightreflectedbyareferencespecimentothatreflectedbyatestspecimen.Thatratioisdependentonspecificinstrumentparameters.Nationalstandardizinglaboratoriesandsomeresearchlaboratoriesmeasurereflectanceoninstrumentscalibratedfrombasicprinciples,therebyestablishingascaleofabsolutereflectanceasdescribedinCIEPublicationNo.44(2).Thesemeasurementsaresufficientlydifficultthattheyareusuallylefttolaboratoriesthatspecializeinthem.Astandardthathasbeenmeasuredonanabsolutescalecouldbeusedtotransferthatscaletoareflectometer.Whilesuchproceduresexist,theconstraintsplacedonthemechanicalpropertiesrestrictthesuitabilityofsomeopticalproperties,especiallythosepropertiesrelatedtothegeometricdistributionofthereflectedlight.Thus,reflectancefactorstandardswhicharesufficientlyruggedandabletobecleaned,departconsiderablyfromtheperfectdiffuserinthegeometricdistributionofreflectedradiance.Thegeometricdistributionofreflectedradiancefromapressedpowderplaqueissufficientlydiffusetoprovideadependablecalibrationofadirectional-hemisphericalreflectometer.Althoughpressedpowderstandardsaresubjecttocontaminationandbreakage,thedirectional-hemisphericalreflectancefactorofpressedpowderstandardscanbesufficientlyreproduciblefromspecimentospecimenmadefromagivenlotofpowder,soastoallowonetoassignabsolutereflectancefactorvaluestoallthepowderinalot.Thispracticedescribeshowtopreparewhitereflectancefactorstandardsfromapowderinamannerthatallowsastandardizinglaboratorytoassigntheabsolutescaleofreflectancetotheplaque.1.1Thispracticecoversproceduresforpreparingpressedpowdertransferstandards.Thesestandardscanbeusedinthenear-ultraviolet,visibleandnear-infraredregionoftheelectromagneticspectrum.ProceduresforcalibratingthereflectancefactorofmaterialsonanabsolutebasisarecontainedinCIEPublicationNo.44().Pressedpowderstandardsareusedastransferstandardsforsuchcalibrationsbecausetheyhaveahighreflectancefactorthatisnearlyconstantwithwavelength,andbecausethegeometricdistributionofreflectedfluxresemblesthatfromtheperfectreflectingdiffuser.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A26
【国际标准分类号】:17_180_20
【页数】:5P.;A4
【正文语种】:


Product Code:SAE AIR4083
Title:Helicopter Power Assurance
Issuing Committee:S-12 Helicopter Powerplant Committee
Scope:This SAE Aerospace Information Report (AIR) defines helicopter turboshaft engine power assurance theory and methods. Several inflight power assurance example procedures are presented. These procedures vary from a very simple method used on some normal category civil helicopters, to the more complex methods involving trend monitoring and rolling average techniques. The latter method can be used by small operators but is generally better suited to the larger operator with computerized maintenance record capability.