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OPCM动态传感特性AE数值模拟与实验研究.docx

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OPCM动态传感特性AE数值模拟与实验研究 Abstract Inthisstudy,weinvestigatedthedynamicsensingcharacteristicsofOpticalPolymerCladdingMode(OPCM)sensorbasedonAcousticEmission(AE)numericalsimulationandexperiments.ThenumericalsimulationwasconductedusingFiniteElementMethod(FEM),andtheexperimentalstudywascarriedoutusingOPCMsensorswithdifferentcladdingthicknessesandloadconditions.TheresultsshowedthattheOPCM-AEsensorexhibitedgooddynamicsensingperformancewithhighsensitivity,highsignal-to-noiseratio,andwidefrequencyresponserange.ThenumericalsimulationandexperimentalstudyalsoprovidedvaluableinsightsintotheoptimizationofOPCMsensordesignandtheapplicationofAEdetectioninthenon-destructivetestingofstructuralmaterials. Introduction AcousticEmission(AE)isawidelyusedtechniqueinNon-destructivetesting(NDT),whichprovidesreal-timemonitoringanddiagnosisofstructuralintegrityanddefects.AEsignalsaregeneratedbytheelasticwavescausedbythestressandstrainofmaterials,whichcanbedetectedandanalyzedtoidentifythetype,location,andseverityofthedefects.However,thesensitivityandaccuracyofAEdetectiondependontheperformanceofthesensorused. OpticalPolymerCladdingMode(OPCM)sensorisatypeoffiber-opticsensorthatcanmeasuretherefractiveindexandthicknessofthecladdinglayerofanopticalfiber.Whenthecladdinglayerissubjectedtoexternalloadsortemperaturechanges,therefractiveindexandthicknessofthelayerwillchange,whichresultsinchangesintheopticalsignaltransmittedthroughthefiber.TheOPCMsensorcandetectthesechangesandconvertthemintoelectricalsignalsformeasurementandanalysis. Inthisstudy,weinvestigatedthedynamicsensingcharacteristicsoftheOPCM-AEsensor,whichcombinestheadvantagesofAEandOPCMtechniques.TheOPCM-AEsensorcansensethechangesinthecladdinglayerandtheelasticwavesgeneratedbythematerialssimultaneously,whichprovidesamorecomprehensiveandaccurateassessmentofthematerials. NumericalSimulation ThenumericalsimulationwasconductedusingFiniteElementMethod(FEM)toinvestigatethedynamicsensingcharacteristicsoftheOPCM-AEsensor.Thesimulationmodelconsistedofanopti