超聲激勵下的光纖光柵傳感響應(yīng)特性研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文超聲激勵下的光纖光柵傳感響應(yīng)特性研究姓名：史巍巍申請學(xué)位級別：碩士專業(yè)：測試計(jì)量技術(shù)與儀器指導(dǎo)教師：譚躍剛201206AbstractTheeffectivedetectionandpreventiontothecrackdamageinmechanicalstructureisthefoundationofthehealthyoperationoftheequipment，andit’Sprovidessecu

2、ritytotheeconomicdevelopmentandlifesafetyItisdifficulttoimplementreal—timedynamicmonitoringwitllmultiplepointsforthetraditionalmethodofmechanicalstructuredamageidentificationMeanwhiletheelectricsensorsarevulnerabletoenvi

3、ronmentalnoiseintheactualworkingcondition，SOthedetectiveeffectisnotgoodenoughTherefore，anewmethod，usingfiberBragggrating(FBG)sensortotesttheultrasonicwhichispropagatinginthestructure，hasbeenprovidedtoachievestructureheal

4、thmonitoringThispapermakesastudyoftheresponsecharacteristicsof也eFBGtoultrasonicinnondefectsstructuresasthisisthefoundationofdamageidentificationThispaperstudiedtheworkingperformanceofthetestingsystemfirstly，andtherespons

5、echaracteristicsofFBOtotheultrasonic，whichWasstimulatedbydifferentirradiationmodes，hadbeenstudiedThenthepositionforFBGsdistributedmeasuringWasdetermined，SOthatthedistributedmeasuringforFBGstoultrasoundhadbeenrealizedThem

6、aincontentofthispaperincludes：1ThestudyoftheworkingperformanceofthetestingsystemTheperformanceparametersofthesystemwereobtainedTheinfluenceontheworkingperformance，whichwaschangedbyvariationofparametersinlightsource，hadbe

7、enexaminedAmethodofsettingupreasonableparametersandthenoteshadbeenproposed2TheultrasoundsignalwassuccessfullyextractedfromdifferentmetalmaterialsTheresponsecharacteristicofFBGtoultrasonic，whichisstimulatedindifferentfreq

8、uencyandincidentangle，wasstudied3TheonedimensionalandtwodimensionalresponsecharacteristicsofFBGtoultrasonichadbeenstudiedOnedimensionalresponserevealstheinfluencelawoftheresponsecharacteristicsofFBGtoultrasonicwhenthestr