空心光纖中的多模干涉及在折射率傳感中的應(yīng)用.pdf

1、天津大學(xué)碩士學(xué)位論文空心光纖中的多模干涉及在折射率傳感中的應(yīng)用姓名：張晨亮申請學(xué)位級別：碩士專業(yè)：物理電子學(xué)指導(dǎo)教師：李恩邦20090801ABSTRACTTheopticalfibersensorsbasedonmultimodeinterferencehavebeendevelopedfastinresentyearsComparedwithtraditionalopticalfibersensors，thedistinctivea

2、dvantagessuchassimplestructure，flexibledesign，widelysensingrangeandSOonmakethempopularinmoreandmorefieldsInthispaper，anewrefractiveindexsensorusingahollowfiber(HF)isintroducedTheprincipleofthesensorismultimodeinterferenc

3、ehappeninginthehollowfiberThemultimodeinterferenceprincipleandevanescentwavephenomenonarepresentedfirstlyThelightdistributingintheHFisalsogivenWeusebeampropagationmethodtogettheexactvalueoflightpowerinthesensingfiberAtla

4、st，weputthesensingfiberintosomeglycerinsolutionwithdifferentrefractiveindices，togetthesensor’ScharacterssuchassensitivityandstabilityWealsodetectthetemperatureinfluenceandsomedifferentmaterialsolutionwiththesamerefractiv

5、eindexThemaincontentoftheresearchandtheinnovativepointare“(1)AnalyzingthepropagationoflightintheHFandmultimodefiber(MMF)，foundingthetheoreticalfoundation，makingsurethatthisparticularstructurecanbeusedinsolutionrefractive

6、indexsensing(2)Introducinganewstructureusingforrefractiveindexsensing，whichisthesinglemodefiber(SMF)plustoMMFplustoHFplustoMMFplustoSMF(SMHMS)ThissensingstructureisbasedonmultimodeinterferencehappeningintheHFThechangeofs

7、urroundingsolutionrefractiveindexinfluencesthemultimodeinterference，andfinelyaffectsthelightpowerdistributinginthefiberAboveisthestructuresensingprincipleTheUseofHFinsteadofphotoniccrystalfibersimplifiesthefabricationoft

8、hesensorandreducescostssignificantly(3)UsingbeampropagationmethodtosimulatetheSMHMSstructureusedforrefractiveindexsensing，givingthelightpowerdistributioninthefibersdirectlyThesimulationhelpsdecidingtheparametersofthefibe

9、rs，makingtheexperimentsexercisable(4)ThefiberstructureissurroundedbyglycerinsolutionwithdifferentrefractiveindicesByanalyzingthechangeofthetransmissionspectrum，wegetthesensitivityofthesensingstructureThetemperatureinflue