基于非均勻采樣的光纖光柵解調(diào)系統(tǒng).pdf

1、中北大學(xué)學(xué)位論文基于非均勻采樣的光纖光柵解調(diào)系統(tǒng)基于非均勻采樣的光纖光柵解調(diào)系統(tǒng)摘要光纖布拉格光柵傳感器憑借著光纖特有的高絕緣性、耐腐蝕性、強(qiáng)抗電磁干擾性以及穩(wěn)定的化學(xué)特性，能夠在高溫、高濕、高壓、強(qiáng)噪聲、強(qiáng)腐蝕性等復(fù)雜條件中穩(wěn)定工作，并能夠結(jié)合光纖遙感、遙測技術(shù)，形成光纖遙感系統(tǒng)和光纖遙測系統(tǒng)，而在傳感領(lǐng)域內(nèi)相對于傳統(tǒng)的電傳感器有著絕對的優(yōu)勢。光通信科技的蓬勃發(fā)展和光柵寫入技術(shù)的不斷進(jìn)步使光纖光柵傳感器也迎來了巨大的發(fā)展契機(jī)。本文主要

2、介紹了一種基于非均勻采樣的光纖光柵解調(diào)系統(tǒng)，提出了利用掃描周期隨機(jī)變化的正弦波來實(shí)現(xiàn)傳感光纖光柵的非等間隔采樣，極大地拓寬了光纖傳感裝置的測量帶寬，同時(shí)也滿足了傳感器對于測量高精度的追求，完善了基于可調(diào)諧FP濾波器重疊多光柵傳感裝置由多光柵的引入導(dǎo)致的數(shù)據(jù)混疊問題，提高傳感光纖光柵的應(yīng)用范圍和靈活性，滿足了光纖傳感解調(diào)裝置對于測量精度和寬度的同時(shí)需求。本文在對光纖光柵解調(diào)原理進(jìn)行深入了解的基礎(chǔ)上，對現(xiàn)有的光纖光柵解調(diào)技術(shù)進(jìn)行了研究和對比

3、，確定基于可調(diào)諧FP濾波器的光纖光柵解調(diào)方案，并詳細(xì)分析影響基于可調(diào)諧FP濾波器的光纖光柵解調(diào)系統(tǒng)性能指標(biāo)的因素；掌握光柵解調(diào)系統(tǒng)各部分元器件的工作原理和性能參數(shù)，分析光纖光柵傳感系統(tǒng)的傳感原理和解調(diào)方式，設(shè)計(jì)硬件電路，搭建基于非均勻采樣的光纖光柵解調(diào)系統(tǒng)測試平臺(tái)；重點(diǎn)研究了非均勻采樣的實(shí)現(xiàn)方法，介紹非均勻采樣算法的解算原理，分別從模擬實(shí)驗(yàn)角度和系統(tǒng)實(shí)際方向?qū)Ψ蔷鶆虿蓸铀惴ǖ目够殳B特性做了驗(yàn)證，結(jié)果證實(shí)非均勻采樣算法能夠以低于尼奎斯特采

4、樣頻率的采樣率對待測信號(hào)進(jìn)行采樣分析，能夠在頻域上完整地還原原始信號(hào)而不產(chǎn)生失真和混疊現(xiàn)象，以及將非均勻采樣和重疊雙光柵傳感解調(diào)系統(tǒng)相融合，提高系統(tǒng)各項(xiàng)性能指標(biāo)。關(guān)鍵詞：光纖光柵解調(diào)，非均勻采樣，重疊多光柵中北大學(xué)學(xué)位論文FBGDemodulationSystemBasedonNonunifmSamplingAbstractAsthefiberbragggratingsenshasexcellenthighinsulatingprope

5、rtiesstronginductiveinterferenceprotectionresistancetocrosionchemicalstabilitymakingitpossibletowkproperlyathightemperatureshighhuityhighpressurestrongnoisecrosivemanyotherspecialenvironment.Fiberopticsenssareinlinewithf

6、iberopticremotesensingthetelemetrytoconstitutetheopticalfiberremotesensingsystemfiberoptictelemetrysystemshaveabsolutesuperiityinthesensingareacomparedwithconventionalelectricalsenss.Therapiddevelopmentofopticalcommunica

7、tiontechnologycontinuousprogressofgratingwrittentechnologyprovidehugeopptunitiesfthedevelopmentoffiberBragggratingsenss.ThispaperdescribesaFBGdemodulationsystembasedonnonunifmsamplingthesinewavewhichcyclesromvariationsis

8、usedtoimplementnonunifmsamplingfurtherimprovethemeasurementbwidthofFBGsensingdemodulationdevice.BasedonfourtimesofthesamplingratecreatedbySIFBGs.SolvedtheproblemofsignaldisttioncausedbythenonunifmsamplingfbasedontunableF

9、Pfilteroverlappingmultigratingdemodulationdeviceimprovetheapplicationrangeflexibilityofthesensingfibergratingbothmeasuringaccuracydemodulationbwidthweremetsimultaneously.OnbasisofdepthstudyoftheprincipleofFBGdemodulation

10、existingfibergratingdemodulationtechniques，thepaperfinalizedthedeterminationisbasedtunableFPfilterFBGdemodulationschemedetailedanalysisthefactsaffectingsystemperfmance.Masterthewkingprincipleperfmanceparametersofgratingd

11、emodulationsystemcomponentsAnalysisthedemodulationsensingprincipleofFBGsensingsystemDesignhardwarebuildupfibergratingdemodulationsystemtestplatfmbasedonnonunifmsamplingFocusesonthenonunifmsamplingmethodIntroducedofnonuni

12、fmsamplingalgithmprinciplesVerifiedthenonunifmsamplingantialiasingalgithmacteristicsfromtheperspectiveofsimulationexperimentspracticalientationrespectively.Theresultsconfirmedthatthenonunifmsamplingalgithmcananalyzetheme