基于反饋效應的光纖激光水聽器.pdf

1、哈爾濱工程大學碩士學位論文基于反饋效應的光纖激光水聽器姓名：郝倩倩申請學位級別：碩士專業(yè)：光學工程指導教師：孫偉民201203基于反饋效應的光纖激光水聽器AbstractAsopticalfibergratingsanderbium—dopedfiberbeinggreatlyimprovedwiththedevelopmentofopticalfibertechnology，thefiberlasershavebeenwidelyus

2、edinthesensorfieldsuchasmeasuringtemperature，pressureandsoundforitsstableperformance，andthemeasurementofunderwatersoundsignalsfiberlaserhydrophonehasalsobeengreatlydevelopedFiberhydrophonesensortakesdistributedfeedback(D

3、FB)ordistributedbraggreflector(DBR)fiberlaserwhichisformedbygratingsanddopedfiberasitssensingunitWecandemodulatetheoutputoffiberlaserusingintensitydemodulationandphasedemodulationwhenmodulatedbytheunderwateraccousticTher

4、esearchofsensingunitanddemodulationmethodisessentialtotheapplicationanddevelopmentoffiberhydrophoneSenS0rThethesisfocusesonthefiberlaserhydrophonebasedonthefeedbackeffectFirstly，thethesisshowsthebackgroundanddevelopmento

5、ffiberlaserhydrophoneSecondly，weanalyzetheDBRfiberlasercharacteristicsbytheoryandexperimentThentheanalysisofDBRfiberlaserisshownastakingthecoherentandincoherentfeedbackintofiberlaser，andwecalculatethelargestLyapunovexpon

6、enttodeterminethesystemstablityatdifferentfeedbackFinally，wetestthefeedbacksystembyexperimentAfterthetheroyandtest，thefiberlaserhydrophonesystembasedonfeedbackissetupSinglemodefibertwistedroundtheaflexiblesilicagelcolumn

7、isconnectedwiththefiberlasertoachievethesystemInsteadofbeingthesensingunit，thefiberlaserisseparatedfromthesensingunit，SOthesystemischeaper，moresimple，andlongerlifetimethanthetrandionaloneThesystemincludessensingunit，DBRf

8、iberlaser，detectionpart，signalacquisitionandprocessingpart，andreal—timedisplaypartUsingintensityandphasedemodulationmethod，wecanmeasuretheacousticwithdifferentfeedback，andwecanachievethefiberlaserhydrophonebasedonfeedbac