基于双峰谱长距离BOTDA的厘米量级热点探测技术研究

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1、国内图书分类号：TP212.14学校代码：10213国际图书分类号：535密级：公开工学博士学位论文基于双峰谱长距离BOTDA的厘米量级热点探测技术研究博士研究生：SanogoDiakaridia导师：董永康研究员申请学位：工学博士学科：电子科学与技术所在单位：航天学院答辩日期：2018年6月授予学位单位：哈尔滨工业大学ClassifiedIndex:TP212.14U.D.C:535DissertationfortheDoctoralDegreeinEngineeringCm-scaleHotSpotDete

2、ctioninLong-RangeBrillouinOpticalTime-DomainAnalysisSensingbasedonDouble-PeakSpectrumCandidate:SanogoDiakaridiaSupervisor:Prof.DongYongkangAcademicDegreeAppliedfor：DoctorofEngineeringSpecialty:ElectronicsscienceandTechnologyAffiliation:SchoolofAstronauticsDa

3、teofDefense:Jun,2018Degree-Conferring-Institution:HarbinInstituteofTechnologyAbstractAbstractThisthesisisacontributiontoperformanceenhancementofthedistributedfibersensorsbasedonstimulatedBrillouinscattering(SBS).TheDistributedfiber-opticsensorsbasedonBrillou

4、inscatteringenabletomeasurechangesinbothtemperatureandstrainalongthefibercable.Thepresentstudyespeciallyfocusedonimprovingthespatialresolutionoflong-rangeBrillouinopticaltime-domainanalysis(BOTDA)sensor.AnewhighspatialresolutionBrillouinbasedinterrogatorenab

5、lingdetectingacm-scaledisturbanceoverlongsensingdistanceswasdeveloped.Thenovelsensingmethodcalled“double-peakspectrum”basedonthedifferentialpulse-widthpairDPP-BOTDAtechniquehasbeenproposedandinvestigatedtheoretically,demonstratednumericallyandimplementedexpe

6、rimentally.InstandardBOTDAsensing,thespatialresolutionisanimportantparameterbecauseitrepresentstheminimumdetectableperturbationlengthofthesensor,whichisdeterminedbythewidthofthepumppulse.However,thisimportantparameterislimitedunfortunatelyto1mbytheacousticph

7、ononslifetime(10-ns).Forpumppulsedurationsshorterthan10-nstheBGSexperiencesbroadening.Thelatterfeatureturnstobeharmfultothemeasurementaccuracybecauseitleadstoapoorfrequencyresolutionwhenestimatingthecentralfrequencyofthegainspectrum.Meanwhile,forpulsesmuchlo

8、ngerthan10-ns,thegainspectralwidthtendstowardtheBrillouinnaturallinewidth(30MHz).FortraditionalBOTDAsensorwhenthespatialresolutionishighenoughtoresolveagivenperturbationtheresultingBGShasasingle