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1、2566IEEETransacTIonsonUlTrasonIcs,FErroElEcTrIcs,andFrEqUEncyconTrol,vol.60,no.12,dEcEmbEr2013StrainSensitivityModelforGuidedWavesinPlatesUsingtheTime-ReversalTechniquealanc.Kubrusly,nicolásPérez,Member,IEEE,Julioc.adamowski,Member,IEEE,andJeanPierrevonderWeidAbstract—Theuseofthetime-reversaltechniq
2、uetodetectmonitoring,especiallyinthedetectionoflocalizeddefectsvariationsintheexternalappliedtractioninastripofalumi-[5],[6].numplateispresented.Experimentshavebeenperformedinatagivenfrequency,thepropagationoflambwavestransmission–receptionmode,usingtwofixedultrasonictrans-ducersneartheendsoftheplat
3、e.Twodifferentparametersispossibleinsymmetricandantisymmetricmodes.Theseofthetime-reversedsignalareusedformonitoringthestrainmodesmaybedispersive,hinderingtheuseofconvention-state,thepeakamplitudeandthefocusingtime.Theinversealsignalprocessingtechniquestodeterminethetimeoffiltertechniquewasusedinthe
4、transmittedsignaltoequal-flightbetweentwopointsintheplate.Time-reversalsig-izetheamplitudespectrum,enhancingthesensitivityinthenalprocessinghasbeenproposedasasuitabletechniquefocusamplitudeby5times.Theexternaltractionsensitivitywasexperimentallyverifiedbyusinganaluminumplate(800todealwiththedifficul
5、tyintroducedbythedispersionof×100×3mm)andtwo5-MHzultrasonictransducersspacedacousticwaves[7],[8].Thetimereversalofacousticwaves700mmapart.Atthemaximumstrainstate(180µstrain),wasoriginallyproposedbyFinkinthelate1980sasathepeakvaluewasreducedbyabout10%intheconventionalmethodtoobtainfocusedacousticwave
6、s[9].processandby50%usingtheinversefilter.ToevaluatetheInthecaseofguidedlambwaves,theuseoftime-effectsofthestraininthetime-reversalsignal,atheoreticalmodelwasconstructed.Thismodelissuccessfulinpredictingreversedsignalscompensatesthedispersionofeachpropa-thechangesinthegroupdelayand,consequently,thef
7、ocusinggationmode.Inathinplateexcitedbyashortpulsewithtimeusingalinearequation.Thisrelationshipcanalsobeusedawidefrequencyspectrum,thesignalisrecompressed,todeterminethestrainlevelquantitatively.Theex
