网络工程外文翻译中英文什么叫光纤与光纤应用领域.docx
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网络工程外文翻译中英文什么叫光纤与光纤应用领域.docx
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网络工程外文翻译中英文什么叫光纤与光纤应用领域
郑州轻工业学院
本科毕业设计(论文)
——英文翻译
题目什么叫光纤与光纤应用领域
学生姓名
专业班级网络工程
学号*
院(系)计算机与通信工程学院
指导教师(职称)(讲师
完成时间2011年6月6日
英文原文
Whatisfiberandfiberopticapplications
Understandingtheopticalfiber,wefirsttakealookatthepropagationoflight.Justastraightline,butwhenthelightexposuretoasubstaneeoccurswhentherefractionandreflection.Weoftenseetheglassandmirrors,"reflective"referstothereflectionoflight;halfofthestraightstickintothecupisnoIongerastraightlookisanillusioncausedbylightrefraction.Infact,wehavebeenabletoseeavarietyofobjects,thatarecausedbyrefractionandreflectionoflight(ifthereisnolight,wecouldnotseeanything.)Propagationoflightinavacuumcanalsobespreadincertainsubstances,certainsubstancesmentionedhere,iscalledintheopticalmediaormediumterms.Glass,quartz,air,water,clearplasticsothelightcanbetransmitted,theyarethemediumoflighttransmission.Differentmediumdensityisnotthesame,suchasweknowthedensityofwaterismuchlargerthantheair.Seeminglysimilarsubstances(suchasglassandquartz),andtheirdensityisnotthesame.So,isdividedinto"lightdensermedium"and"lightsparsemedia."Whenthelightfromonemediumwillbeinjectedintoanothermediumrefraction,liketurningthelightchildfriends.Evenwiththesamematerial,alsoproducedbysomeofthedensityofdifferentenvironmentalconditions,suchastheairsomewherehot(lowdensity),somewhereinthecoldair(highdensity),thelightpassingthroughhotandcoldaircanalsooccurwhentherefraction(Wearefamiliarwiththemirageisaresultofthissituationoccurs.)Shinethelightonthemediumsurfaceiscalledincident,refractedthroughthemediumoflightiscalledrefractionoflight.Incident,reflectedlightandmediuminterface(phasetwomediawhere)thereisarelationshipbetween,thisistheangleofincidenceandrefraction.Twopointsofviewangleastheincidentlightchanges.Whenthelightfromtheopticaldensermediuminjectedintothemediumanglelightthinningtoacertainextent,thelightcannoIongerlaunchedintoanothermedium,sowillhaveatotalreflectionoflight.
Understandingthepropagationoflight,letusknowfiber.Isasimpleglassfibercanbe,accordingtodifferentrequirements,itcanbemadeverythin,usuallyfromafewmicronstohundredsofmicrons.Alotoffiberwillusuallyincreaseinthesurface(coating)layerofanothermaterial,calledcladdingorcoatinglayer.Thislayerofmaterialcanbeusedasthemediumfromtherefractionoflightthinning,andsomeflexibilitycanenhancetheopticalfibersothatitcanbebent.Nofibercoatinglayeriscalledbarefiber.Barefibercanalsobetransmittedopticalsignal(opticalfiberandthentheairbecametwodifferentmedia.)Dependingontheneedsofpeopleinglassorquartzotherchemicalelementscanbeadded,youcanuseavarietyofcomplextechnologytomakethinfiberswithacomplexinternalstructure.Therefore,thefiberisalotofvarieties,andsomecansendthousandsofdifferenttypesoflightwaves,whileothersonlybyasinglewaveoflight.Fiberproductionprocessisrelativelyfine,usuallycalledthedrawing.Opticalfibercommunicationscableusedintherootbythetenstohundredsofsuchintegratedopticalfiber,eachfibercantakeahugetraffic.
Therefore,infiberopticaltransmission,mainlythecommoncoreandthecladdingeffect.Refractionoflightaccordingtotheabovementionedreason,wewillunderstandthatthefibercore,anditiscertainlyoutsideofthecladdingmaterialoftwodifferentdensities,andthecoredensityshouldbelargerthanthepacketlayer.Thus,aslongasasuitableangleofincominglight,thisbeamoflightwillbekeptintotalreflectionwithinthefibertotransmittotheotherend.
Practicalapplicationofopticalfiber,aslongasnottoobent,thelightwillenterthefiberwithinthefiberbouncesbackandforth,twistsandturnsforwardpropagation,butalsosomelightintothecladdingandinitsdissemination.Thepropagationoflightinfiberwillalsoinspireacertainwavemode,whichrelatedwiththethicknessofthefiber,corediameteristoosmalltodeterminethetransmissionmodeisdifficulttoform,thecorediameteristoothicktoanincreaseintransmissionmode,thedispersionofaserious,solidThefibercorecannotbetoothickortoothin,generallytransmittedseveraltimestoseveraltimesthewavelength.Inaccordaneewiththeopticalfibertoallowtransmissionofelectromagneticwavesonthemode,canbedividedintosingle-modeopticalfiberandmultimodefiber.Single-modefiberthatcantransmitanelectromagneticwavemode,multimodefiberthatcantransmitmultiplewavemodes,infact,single-modefiberandmultimodeopticalfiberofthepoints,thatis,thediameterofthecorepoints.Smallsingle-modefiber,multimodefiberthick.Usedinfiberopticcablenetworksareallsingle-modefiber,itstransmissioncharacteristics,andbandwidthofupto10GHZ,canbetransmittedinanopticalfiber60PAL-DTVsets.
Wehaveapreliminaryunderstandingoftheprinciplesoffiberoptictransmissionoflight,thenitisalsohowavarietyoftext,images,soundtransmissionfrom?
Itturnedoutthattheuseofelectronictechnology,peoplecanbetext,images,soundandotherinformationintoelectronicsignals,makingthemallintothe"1"and"0"digitstringconsistingof,thatiswhatweoftencalla"digitaltechnology".Indigitaltechnology,the1and0,saidcircuitforopeningandclosing,theuseoftheopticaltechnology,thebrightanddullthattheycanachievetwostates.So,peoplethroughOptical(fiberinputtotheopticalsignaldevice)toissueaseriesoflightanddarkfiberdifferentlightsignal,opticalfiberreceivestheotherendoftheopticalsignal,thenthroughthespecializedequipmenttorestoreitintoadigitalsignal,Finally,fromTV,radio,computersandotherdigitalsignalwillbereducedtotext,images,soundsandsoon.
Opticalfibercommunicationhasatremendousadvantage,first,itscapacityisamazing,athinopticalfibercantransmittensofthousandsorevenhundredsofmillionsofroadcalls,youcantransmitthousandsoftelevisionsets,whichisunmatchedbyothertransportmeansThe.Secondtheopticaltransmissionoflightsignals,electromagneticinterfereneefromoutsideit,notafraidofhumidity,notafraidoferosion,pollution-free,secureandstrong.Opticalfibertransmissionsignallossissmall,onlyone-tenthofthecable.Generalcoaxialcable,atintervalsof1.5kmisnecessarytosetuparelaystationtocompensateforsignalattenuation;andfiberopticcommunicationsrelaystation,thedistancecanexceed10kilometers.Inaddition,thefiberrawmaterialisthatwearefamiliarwiththesand(quartz),andmoreisontheearthandverycheap.Quartzcanbeproducedafewgramsakilometer-longopticalfiber.Thusinsteadofanordinarymetalwirewithafibercansavealotofvaluablenon-ferrousmetalscopperandlead.Verylightweightoffiber,8fibermadeoffiberopticcable,eachweighingabout60kgkmonly,whilethesamenumberofordinary
cableis4tons.
Infact,farmorethanthefiberopticalcommunicationskillsinthisarea,inmanyways,especiallyinhigh-techfields,pientyoffibernotonlyuseless,butnewtechnologyisleadingtherevolutionyet.
Weknowthatthelightcanbetransmittedinthefiberwhichisalsoknowntolightavarietyofinformationwiththebasicmethod.Inspecificapplicationsofsuchfiber,someonlyneedone(suchasopticalcommunication),whileothersneedalotofroots(suchastransferbeams).Inaddition,thereisagreatapplicationofopticalfiber,thatis,imagetransmission.Videoimagetransmissionmeanstodirecttransmissionthroughthefiber,whilethemiddleisnoIongerasopticalcommunicationthroughtheconversionprocessasasignal.Seeninthislight,thetransmittedlightfibercanbedividedintotwocategories,onewithavarietyofsignallight,onecanseethegeneralimageofourdailylight.Sincewecanexpressallkindsofinformationlight,thenthefibercandothingswaytoomuch.Peopleusetocreateawidevarietyoffiberopticequipmentthatwecollectivelyarecalledopticalfibersensors.Fiberopticsensorscannotonlytransmitinformation,butalsoaccesstoinformation.Opticalfibersensorscanmeasuretemperature,pressure,vibration,content,position,rotation,deformation,speed,singlering,voltage,electromagneticfields,etc.,arenumerous.Although,likefiberoptictransmissionoflightsignalswithoutchargeintoomanythings,butitsmanufacturehastomuchtrouble.Opticalfibertransmission,asisusuallythenumberonemillionbythetensofthousandstotheintegrationofveryfinefiberbundle,calledtheimagebundles.Itiswidelyusedinendoscopicaspectsofthehealthcareindustryasweknowittobe.
英文翻译
什么叫光纤及光纤应用领域
在认识光纤之前,我们先来了解一下光的传播。
光是直线传播的,但当光线照射到某一物质上时便会发生折射和反射。
我们常会见到玻璃和镜子“反光”就是指光的反射;一半插入水杯中的直棍看起来不再是直的是光的折射造成的假象。
其实,我们之所以能够看到各种物体,那都是光的折射和反射造成的(如果没有光,我们什么也看不到)。
光可以在真空中传播,也可以在某些物质中传播,这里所说的某些物质,在光学的术语中叫做介质或媒质。
玻璃、石英、空气、水、透明塑料等等都可以传播光线,它们都是传播光的介质。
不同的介质密度是不一样的,比如我们知道,水的密度要比空气大很多。
表面上看起来差不多的物质(如玻璃和石英),它们的密度也是不一样的。
因此,又分“光密介质”和“光疏介
质”O当光线从一种介质射入另一种介质时就会发生折射,好像是光线拐弯儿啦。
即使是同一物质,也会因某些环境条件而产生密度不同,如某处的空气热(密度低),某处的空气冷(密度高),光线在穿越冷热空气时也会发生折射(我们熟知的海市蜃楼就是因这种情况而发生的)。
照到介质表面上的光叫入射光,经过介质折射的光叫折射光。
入射光、折射光和介质的界面(两种介质相接的地方)之间存在着一种相互关系,这就是入射角和折射角。
两个角度随着入射光线角度的变化而变化。
当光线从光密介质射入光疏介质的角度变化到一定程度时,光就不
能再射入另一个介质中
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