BS EN 61300-3-6-2003 光纤互连设备和无源部件.基本试验和测量步骤.检验和测量.回波损耗
作者:标准资料网 时间:2024-05-19 07:50:44 浏览:8823
来源:标准资料网
【英文标准名称】:Fibreopticinterconnectingdevicesandpassivecomponents-Basictestandmeasurementprocedures-Examinationsandmeasurements-Returnloss
【原文标准名称】:光纤互连设备和无源部件.基本试验和测量步骤.检验和测量.回波损耗
【标准号】:BSEN61300-3-6-2003
【标准状态】:作废
【国别】:英国
【发布日期】:2003-05-09
【实施或试行日期】:2003-05-09
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Cables;Checkgauge;Components;Connectiontechnology;Electricalengineering;Fasteners;Fibreoptics;Glassfibrecables;Measuringtechniques;Monomodefibres;Opticalinstruments;Opticalwaveguides;Polarization(wavephysics);Reflectancemeasurement;Reflectometer;Returnloss;Testing
【摘要】:ThispartofIEC61300presentsproceduresforthemeasurementofthereturnloss(RL)ofafibreopticdeviceundertest(DUT).RL,asusedinthisstandard,istheratioofthepower(Pi)incidenton,orentering,theDUTtothetotalpowerreflected(Pr)bytheDUT,expressedindecibels:RL=-10·log(Pr/Pi)(1)Returnlossisapositivenumber.
【中国标准分类号】:L23
【国际标准分类号】:33_180_20
【页数】:28P.;A4
【正文语种】:英语
【英文标准名称】:Neutronfluencemeasurement;fast-neutronfluencedeterminationwithniobactivationdetectors
【原文标准名称】:中子积分通量测量.用铌活化探测器测定快中子积分通量
【标准号】:DIN25456T.4-1990
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:
【国际标准分类号】:
【页数】:
【正文语种】:
【英文标准名称】:StandardTestMethodforCalculationofStagnationEnthalpyfromHeatTransferTheoryandExperimentalMeasurementsofStagnation-PointHeatTransferandPressure
【原文标准名称】:通过临界点传热与压力的热传递理论和实验测量来计算临界热函的标准试验方法
【标准号】:ASTME637-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:航空航天运输;焓;热传递;材料;数学计算;测量;压力;航天技术;临界点
【英文主题词】:enthalpydistribution;enthalpyprofile;localenthalpy;stagnationenthalpy
【摘要】:Thepurposeofthistestmethodistoprovideastandardcalculationofthestagnationenthalpyofanaerodynamicsimulationdeviceusingtheheattransfertheoryandmeasuredvaluesofstagnationpointheattransferandpressure.Astagnationenthalpyobtainedbythistestmethodgivesaconsistentsetofdata,alongwithheattransferandstagnationpressureforablationcomputations.1.1Thistestmethodcoversthecalculationfromheattransfertheoryofthestagnationenthalpyfromexperimentalmeasurementsofthestagnation-pointheattransferandstagnationpressure.1.2Advantages1.2.1Avalueofstagnationenthalpycanbeobtainedatthelocationinthestreamwherethemodelistested.Thisvaluegivesaconsistentsetofdata,alongwithheattransferandstagnationpressure,forablationcomputations.1.2.2Thiscomputationofstagnationenthalpydoesnotrequirethemeasurementofanyarcheaterparameters.1.3LimitationsandConsiderationsTherearemanyfactorsthatmaycontributetoanerrorusingthistypeofapproachtocalculatestagnationenthalpy,including:1.3.1TurbulenceTheturbulencegeneratedbyaddingenergytothestreammaycausedeviationfromthelaminarequilibriumheattransfertheory.1.3.2Equilibrium,Nonequilibrium,orFrozenStateofGasThereactionratesandexpansionsmaybesuchthatthegasisfarfromthermodynamicequilibrium.1.3.3NoncatalyticEffectsThesurfacerecombinationratesandthecharacteristicsofthemetalliccalorimetermaygiveaheattransferdeviationfromtheequilibriumtheory.1.3.4FreeElectricCurrentsThearc-heatedgasstreammayhavefreeelectriccurrentsthatwillcontributetomeasuredexperimentalheattransferrates.1.3.5NonuniformPressureProfileAnonuniformpressureprofileintheregionofthestreamatthepointoftheheattransfermeasurementcoulddistortthestagnationpointvelocitygradient.1.3.6MachNumberEffectsThenondimensionalstagnation-pointvelocitygradientisafunctionoftheMachnumber.Inaddition,theMachnumberisafunctionofenthalpyandpressuresuchthataniterativeprocessisnecessary.1.3.7ModelShapeThenondimensionalstagnation-pointvelocitygradientisafunctionofmodelshape.1.3.8RadiationEffectsThehotgasstreammaycontributearadiativecomponenttotheheattransferrate.1.3.9HeatTransferRateMeasurementAnerrormaybemadeintheheattransfermeasurement(seeMethodE469andTestMethodsE422,E457,E459,andE511).1.3.10ContaminationTheelectrodematerialmaybeofalargeenoughpercentageofthemassflowratetocontributetotheheattransferratemeasurement.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A54
【国际标准分类号】:
【页数】:16P.;A4
【正文语种】:
