23819.激光相干探測(cè)水下聲信號(hào)的實(shí)驗(yàn)研究

1、學(xué)號(hào)：201100357006201100357006分類號(hào)：O4343碩士學(xué)位論文激光相干探測(cè)水下聲信號(hào)的實(shí)驗(yàn)研究研究生姓名：曹增輝指導(dǎo)教師：張駿（教授）學(xué)科門類：理學(xué)專業(yè)名稱：光學(xué)論文提交日期：2014.4煙臺(tái)大學(xué)碩士學(xué)位論文IIAbstractInthispapertheunderwatersoundfieldissimulatedexperimentalstudiedbyusinglasercoherentdetection.A

2、boveallsimulationprogramismadebyMatlabsoftwareaccdingtotheprincipleofunderwateracousticvibrations.Thedetectiontonaturalwaveofwatersurfacewithoutunderwateracousticsignalswithunderwateracousticsignalsofdifferentfrequencies

3、aresimulatedrespectively.Furthermeanexperimentaldeviceadoptingfiberlasercoherentdetectionisdesignedunderwateracousticsignalsarestudiedexperimentally.Finallytheextractionmethodinregardtolowfrequencyunderwateracousticsigna

4、lsisdiscussed.Naturalwaveofwatersurfaceisdetectedresearchedexperimentallyinthispaper.Wealsostudyexperimentallydifferentstateofunderwatersoundfieldrespectivelyfexamplethesoundsourcewithdifferentvibrationfrequencyacousticv

5、ibrationindifferentdepthsunderwater.Experimentalresultsshowthat:(1)TheunderwateracousticsignalissimulatedbyMatlabsoftwarethemodeloflasercoherentdetectiononfluctuationsinthewatersurfacecausedbyunderwatervibrationsourceise

6、stablished.Bythismodelitrevealsthelawofacousticvibrationsitprovidesthetheeticalbasisftheexperimentaboutusinglasercoherenttodetectunderwateracousticsignals.(2)Theacteristicsofnaturalfluctuationsonthewatersurfacearestudied

7、experimentallybyusinglasercoherentdetection.Theinfmationofnaturalwaveofwatersurfaceareanalyzedtheresultsshowthatthefrequencyofnaturalfluctuationsonwatersurfaceisbetween9~25Hz.Theresultsisconsistentwiththeexperimentaldete

8、ctionresultsthatthetimeintervaloftheneighbedresolutepointswhichis20~60ms.(3)Theunderwateracousticsignalsofdifferentfrequencyintensityaredetectedbyusinglasercoherentdetection.Theresultsshowthatunderwatervibrationcanbedete