基于P-OTDR分布式光纖傳感器的若干問題研究.pdf

1、北京交通大學碩士學位論文基于POTDR分布式光纖傳感器的若干問題研究姓名：董賢子申請學位級別：碩士專業(yè)：光學工程指導(dǎo)教師：吳重慶20040301北京交通人學傾卜學位論文學生:策賢了V師:吳取慶AbstractPolarizationsensitiveopticaltimedomainreflectometer(POTDR)isakindofdistributedsensorwhichmakesuseofinspectingtheStat

2、eofPolarization(SOP)infiberforsensing.AsweknownthechangeofSOPinfiberisactuallyarousedbythechangeofphaseconsequentlythissensingmethodisverysensitiveanditcanfeelverylittleinfluenceofextratemperatureorstrain.Howeverjustduet

3、oitssensitivepropertiestoextraenvironmentssometinyefectmightarousetheinstabilityofSOPinfiber.InadditionduringthecourseofdetectingSOPinfiberonehavetomodulatethepolarizationcontrollerpolarimeterorotherequipmentetc.Whethert

4、hechangeoftheseequipmentswillhaveefectontheinstabilityofSOPinfiberisaninterestedproblem.IfthesechangesalterthestabilityofSOPinfiberitisnosensetoinspectingthechangeofSOPinfiberusingthisscheme.Inadditionallkindsofnoiseinsy

5、stemsuchashotnoiseoflaserASEnoiseofEDFAorsomenoisecomingfromopticalreceiveretcdeterioratetheSignaltoNoise(SNR)ofthesignalsandspaceresolutionofsystems.ImprovingtheSNRandspaceresolutionandextractingtheSOPinformationarealso

6、theproblemswehavetoface.FocusonkeepingstabilityofSOPinfiberimprovingSNRofsignalenhancingspaceresolutionofsystemandextractingSOPinformationfromdatathepaperdosomeworkasfollows:1.Thepaperintroducedtheprinciplepurposeandpara

7、metersofOTDR.OnthisbaseitintroducedtheexperimentequipmentofPOTDRandstudytwoimportantuseofPOTDR:oneisusedforinspectingtheSOPdistributedoffiberandtheotherisusedfordistributedfibersensing.AtlastitdeducedtheSOPdistributedoff

8、iberintheory.2.ThepaperstudiedthestabilityoftheSOPinfiberthroughexperimentandanalyzedsomephenomenaappearedduringadjustofequipment.Alltheseexperimentensuredthefeasibility萬ofthesystem.3.Throughcomputersimulatingandexperime