光纤光栅在工程结构检测中的应用与实验研究

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1、天津大学博士学位论文光纤光栅在工程结构检测中的应用与实验研究姓名：吕辰刚申请学位级别：博士专业：物理电子学指导教师：武星20070501都小于5,u6"，识别率是温度补偿前的10-20倍。研究表明，神经网络算法适用于光纤光栅应变传感器的温度补偿，为今后的包含温度信息的多传感器数据融合研究提供了依据。’关键词：光纤光栅，解调，数字滤波，传感网络，神经网络，根键式桥墩，温度补偿．ABSTRACTFiberBragggrating(FBG)sensorshaveanumberofdistinguishingadvantages．TheFBGsensordevicesaresimple，i

2、ntrinsic，distributingsensingelementsandhavealltheadvantagesnormallyattributedtofibersensors，suchaShighsensiti啊够，EMIimmunity，waterproofandanti-erode．Withtheimprovementofsignaldemodulationandanalyses，FBGsensorshavebeenwildlyresearchedinmanydomains，suchcivilprojects，spaceflightandnavigation，elect

3、ricpower，petroleumandmedicaltreatment．HighprecisiondigitalFBGsensorsignaldemodulationsystemshavewildlypracticalfutureinhealthyinspectionofbridgestructure，andit’SalsoimportantresearchofFBGsensorstechnologyrecently．DistributionofFBGsensorsnetworkandthemanagementofalargebulkofsignalsneedtosetupaF

4、BGintelligentstructure．Thereisanewdirectionofresearchaboutinformationfusionme也odofsensorssignalsusingneuralnetworktechnology．Withtheintroductionofneuralnetworktechnology,theFBGsensorsintelligentstructuresand．systemswillmaximallydeveloptopracticalityandsystematismassoonaspossible．Themaincontent

5、sandkeycreationpointsofthisdissertationareaSfollows：(1)DesignedadigitalFBGsensorall—spectrumsignalsscanscheme，anddevelopedtherelevantequipment．ThroughthenoiseanalysesinprogressofFBGreflectionspectrumsignalstransmissionandcollection，weintroduceddigitalmatchedfilter(DMF)anddigitalzero-phasefiler

6、(DZF)，madearithmeticanalysesandsimulatedthesystemusingLabviewsoftware．WecarriedoutstraintestusingcantileverfabricinLab，andcontrastedthetwodigitalfiltertechnologies．Thesystemprecisioncallreachtol肛，andu。wholestructureisbetterthanotherpracticalFBGsensorsystemsinCOIntoon．(2)Presentedainformationfu

7、sionmethodofFBGsignalsusingneuralnetworktechnology,andnladetheoreticalanalysesandexperimentsimulation．TheapplicationofFBGsensorandneuralnetworkinstraindamageinspection，inwhichfiberBragggratingwasusedassensingelement,concretesimplesuppor