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【英文标准名称】:StandardTestMethodforMonitoringAtmosphericCorrosionTestsbyElectricalResistanceProbes
【原文标准名称】:用电阻试样监测大气腐蚀试验的试验方法
【标准号】:ASTMB826-2009
【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】:B02.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:atmosphericcorrosionmonitor;atmosphericcorrosiontesting;corrosivitymonitor;electricalresistanceprobe;environmentaltest;mixedflowinggastest;resistancemonitorprobe;Atmosphericcorrosionanalysis;Corrosivegastesting;Corrosivitymonito
【摘要】:Corrosivitymonitoringoftestenvironmentsprovidesameanstomonitoranintegratedvalueoftestcorrosivitywhichcannotbeevaluatedfromtestparametersthemselves,suchastemperature,humidity,andgasconcentration.Assuchthemonitorvaluecanbeusedforspecificationpurposessuchastestvalidation.Electricalresistancemonitoringofconductorsexposedtocorrosivemediaisawell-establishedpractice.,,,Theresistancemethodassumesuniformcorrosionovertheentiresurfaceoftheexposedmetalconductorsegment.Localcorrosionsuchaspitting,crevice,orgrainboundarycorrosionmayprovideinvalidestimatesoftestcorrosivity.Markedchangesinslopeofthecurveofelectricalresistanceratioversustimemayindicateundesiredprocesseswhichcanbeduetodeficienciesinthetestatmosphereorinthemonitoritself.BecauseoflimitationsofthediffusionprocesswithinthecorrosionproductformedonthemetalconductorsegmentoftheRMprobewhenpassivatingcorrosionfilmsareformed,resistancemonitoringmaynotbeusefulfortestchambermonitoringpurposesforverylongtestexposures.ChambermonitoringisdependentondetectingchangesintherateofcorrosionoftheRMasanindicatorsignalthatspecifiedgasconcentrationsmustbereverified.However,lowcorrosionrateslimittheabsolutevalueoftherateofchangeofcorrosionratewithchangeoftestconditions;forparabolicfilmgrowthprocesses,thegrowthratedecreaseswithtimelimitingthesensitivityoftheRMatextendedtesttimes.SincecorrosionratecanbeacomplexfunctionoftestparametersinMFGtestswithanygivenmetalprimarilyresponsivetoasubsetofthegasesintheMFGenvironment,morethanonetypemetalresistanceprobeisrequiredinordertoassistinmaintenanceofrelativegasconcentrations.Forsuchtestspecifications,valuesofresistanceratiosmustbereferredtoratiosobtainedunderknowntestconditionsassuppliedbythetestspecifier.Informationrelatingtothesensitivityofvariousmetalstovariouscorrodantshasbeenpublished.,RMprobescanbeusefulfrom1%ofthicknessconsumedupwardto50%ofthicknessconsumedbythecorrosionfilmgrowth.Conductorthicknessesbetween25nmand0.2mmhavebeenreportedandcommonsizesareavailablecommercially.1.1Thistestmethodprovidesameansformonitoringcorrosivityofenvironmentalteststhatinvolveexposuretocorrosivegases.1.2Thistestmethodusesaresistancemonitor(RM)probefabricatedfromachosenmetalconductor,withoneconductorsegmentuncoveredtopermitexposureofthechosenmetalconductortothecorrosivegasmixtureandthesecondconductorsegmentcoveredtoprotectthemetalconductorofthissegmentfromdirectattackbythecorrosivegasmixture.Thecoveredconductorsegmentprovidesareferenceforevaluatingchangesintheuncoveredsegment.Theratiooftheresistanceoftheexposedsegmenttothatofthecoveredsegmentprovidesameasureoftheamountofmetalconductorthathasreactedwiththecorrosivegastestenvironmenttoformpoorlyconductingcorrosionproduct,thusprovidingameasureoftestcorrosivity.1.3Resistancemonitoringisapplicabletoabroadrangeoftestconditionsbyselectionoftheappropriatemetalconductorandinitialmetalthickness.1.4ThismethodissimilarinintenttoTestMethodsB808.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithits......
【中国标准分类号】:H25
【国际标准分类号】:77_060
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Opticalamplifiers-Testmethods-Polarizationmodedispersionparameter-Poincaresphereanalysismethod
【原文标准名称】:光学放大器.试验方法.偏振模式分散参数.Poincare球面分析方法
【标准号】:BSEN61290-11-2-2005
【标准状态】:现行
【国别】:英国
【发布日期】:2005-08-19
【实施或试行日期】:2005-08-19
【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】:放大器;半导体;偏振;光学装置;分散;纤维光学;纤维;光学;光弹法;光波导;电气工程;POINCAR;波长;试验;分析;数学计算
【英文主题词】:Amplifiers;Analysis;Dispersion;Electricalengineering;Fibreoptics;Fibres;Mathematicalcalculations;Opticaldevices;Opticalwaveguides;Optics;Photoelasticmethods;Poincaré;Polarization(wavephysics);Semiconductors;Testing;Wavelengths
【摘要】:ThispartofIEC61290appliestoallcommerciallyavailableopticalamplifiers(OAs)includingopticalfibreamplifiers(OFAs)usingactivefibresandsemiconductoropticalamplifiers(SOAs)usingsemiconductorgainmedia.Polarizationmodedispersion(PMD)causesanopticalpulsetospreadinthetimedomain.Thisdispersioncouldimpairtheperformanceofatelecommunicationssystem.Theeffectcanberelatedtodifferentialgroupvelocityandcorrespondingarrivaltimesofdifferentpolarizationcomponentsofthesignal.Foranarrowbandsource,theeffectcanberelatedtoadifferentialgroupdelay(DGD)betweenpairsoforthogonallypolarizedprincipalstatesofpolarization(PSP).ThistestmethoddescribesaprocedureformeasuringthePMDofOAs.ThemeasurementresultisobtainedfromthemeasurementofthenormalisedStokesparametersattwocloselyspacedwavelengths.ThemathematicalbasistogetherwithanexampleofcalculationforthePoincaresphereanalysis(PSA)methodtocalculatePMDisprovidedinthetechnicalreportIEC61292-5.Themethoddescribedhereinhasbeenshowntobeimmunetopolarization-dependentgain(PDG)andpolarization-dependentloss(PDL)uptoapproximately1dB[].AlthoughthePSA,inpractice,isapplicabletounpumped(thatis,unpowered)OAs,thePSAtechniqueinthisstandardappliestopumped(thatis,powered)OAsonly.NOTEAllnumericalvaluesfollowedby()aresuggestedvaluesforwhichthemeasurementisassured.Othervaluesmaybeacceptablebutshouldbeverified.
【中国标准分类号】:M33
【国际标准分类号】:33_180_30
【页数】:18P.;A4
【正文语种】:英语