您的位置: 标准下载 » 国际标准 » DIN 德国标准 »

DIN EN 61603-2/A1-2005 采用红外辐射的音频和/或视频及相关信号的传输.第2部分:声宽频带和有关信号用传输系统

作者:标准资料网 时间:2024-05-22 06:16:15  浏览:8809   来源:标准资料网
下载地址: 点击此处下载
【英文标准名称】:Transmissionofaudioand/orvideoandrelatedsignalsusinginfraredradiation-Part2:Transmissionsystemsforaudiowidebandandrelatedsignals(IEC61603-2/A1:2004);GermanversionEN61603-2/A1:2004
【原文标准名称】:采用红外辐射的音频和/或视频及相关信号的传输.第2部分:声宽频带和有关信号用传输系统
【标准号】:DINEN61603-2/A1-2005
【标准状态】:现行
【国别】:德国
【发布日期】:2005-02
【实施或试行日期】:2005-02-01
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:定义;宽频带传输;传输;图象传输;数据传送;红外线;声传输;语音传输;额定值;视频信号;声信号;电气工程;信号传输;数字的;头戴送受话器;远程通信;电声学;音频信号;语言传输系统;传输系统;视听资料;控制信号;红外线辐射;
【英文主题词】:
【摘要】:Thisamendmendreplacessubclause6.8.3.
【中国标准分类号】:M73
【国际标准分类号】:33_160_99
【页数】:5P;A4
【正文语种】:德语


下载地址: 点击此处下载
【英文标准名称】:Flangedpipesandflangedsteelfittingsglasedlined;PN10
【原文标准名称】:搪瓷钢制法兰管和法兰异型件.公称压力10
【标准号】:DIN2873-1982
【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】:StandardTestMethodforMeasuringExtremeHeat-TransferRatesfromHigh-EnergyEnvironmentsUsingaTransient,Null-PointCalorimeter
【原文标准名称】:用瞬变零点量热器测量高能环境的超级传热速率的标准试验方法
【标准号】:ASTME598-2008
【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】:E21.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:calorimeter;convective;heatflux;heatfluxgage;null-point;radiative;transienttemperature;Calorimeter--aerospaceapplications;Convectiveenergy;Extremeheattransferrates;Heatflux;Heatingtests--aerospacematerials;Heattransfer;Trans
【摘要】:Thepurposeofthistestmethodistomeasureextremelyhighheat-transferratestoabodyimmersedineitherastaticenvironmentorinahighvelocityfluidstream.Thisisusuallyaccomplishedwhilepreservingthestructuralintegrityofthemeasurementdeviceformultipleexposuresduringthemeasurementperiod.Heat-transferratesrangingupto2.84x00D7;102MW/m2(2.5x00D7;104Btu/ft2-sec)(7)havebeenmeasuredusingnull-pointcalorimeters.Useofcoppernull-pointcalorimetersprovidesameasuringsystemwithgoodresponsetimeandmaximumruntimetosensorburnout(orablation).Null-pointcalorimetersarenormallymadewithsensorbodydiametersof2.36mm(0.093in.)press-fittedintothenoseofanaxisymmetricmodel.Sourcesoferrorinvolvingthenull-pointcalorimeterinhighheat-fluxmeasurementapplicationsareextensivelydiscussedinRefs(3-7).Inparticular,ithasbeenshownbothanalyticallyandexperimentallythatthethicknessofthecopperabovethenull-pointcavityiscritical.Ifthethicknessistoogreat,thetimeresponseoftheinstrumentwillnotbefastenoughtopickupimportantflowcharacteristics.Ontheotherhand,ifthethicknessistoosmall,thenull-pointcalorimeterwillindicatesignificantlylarger(andtimedependent)valuesthantheinputorincidentheatflux.Therefore,allnull-pointcalorimetersshouldbeexperimentallycheckedforpropertimeresponseandcalibrationbeforetheyareused.Althoughacalibrationapparatusisnotverydifficultorexpensivetofabricate,thereisonlyoneknownsystempresentlyinexistence(6and7).Thedesignofnull-pointcalorimeterscanbeaccomplishedfromthedatainthisdocumentation.However,fabricationofthesesensorsisadifficulttask.Sincethereisnotpresentlyasignificantmarketfornull-pointcalorimeters,commercialsourcesofthesesensorsarefew.Fabricationdetailsaregenerallyregardedasproprietaryinformation.Someusershavedevelopedmethodstofabricatetheirownsensors(7).Itisgenerallyrecommendedthatthecustomershouldrequestthesuppliertoprovidebothtransientexperimentaltimeresponseandcalibrationdatawitheachnull-pointcalorimeter.Otherwise,theendusercannotassumethesensorwillgiveaccurateresults.Interpretationofresultsfromnull-pointcalorimeterswill,ingeneral,bethesameasforotherheat-fluxsensorsoperatingonthesemi-infinitesolidprinciplesuchascoaxialsurfacethermocouplesandplatinumthin-filmgages.Thatis,theeffectsofsurfacechemicalreactions,gradientsinthelocalflowandenergyfields,thermalradiation,andmodelalignmentrelativetotheflowfieldvectorwillproducethesamequalitativeresultsaswouldbeexperiencedwithothertypesofheatfluxsensors.Inaddition,signalconditioninganddataprocessingcansignificantlyinfluencetheinterpretationofnull-pointcalorimeterdata.1.1Thistestmethodcoversthemeasurementoftheheat-transferrateortheheatfluxtothesurfaceofasolidbody(testsample)usingthemeasuredtransienttemperatureriseofathermocouplelocatedatthenullpointofacalorimeterthatisinstalledinthebodyandisconfiguredtosimulateasemi-infinitesolid.Bydefinitionthenullpointisauniquepositionontheaxialcenterlineofadisturbedbodywhichexperiencesthesametransienttemperaturehistoryasthatonthesurfaceofasolidbodyintheabsenceofthephysicaldisturbance(hole)forthesameheat-fluxinput.1.2Null-pointcalorimetershavebeenusedtomeasurehighconvectiveorradiantheat-transferratestobodiesimmersedinbothflowingandstaticenvironme......
【中国标准分类号】:A54
【国际标准分类号】:17_200_10
【页数】:10P.;A4
【正文语种】:英语