基于光纖干涉儀的激光超聲檢測研究.pdf

1、北京交通大學(xué)碩士學(xué)位論文基于光纖干涉儀的激光超聲檢測研究姓名：張建亮申請學(xué)位級別：碩士專業(yè)：光學(xué)工程指導(dǎo)教師：盛新志吳重慶20071201jb立鑾通厶堂亟堂焦論塞△旦一工_jL塵—UABSTRACTABSTRACT：Fiberinterferometeriscompatibletobeusedinlaserultrasounddetectionasitissmallvolume，lowweight，compactstructureand

2、highsensitivityHoweveranyunsteadinessofphaseandpolarizationofthelightcouldbringtheunsteadinessoftheinterferometerduetoenvkonmentfactorsSokeeptheinterferometersteadyisinacriticalpositioninthefieldoflaserultrasounddetectio

3、nwithfibreMicheisoninterferometerTraditionalfiberMichelsoninterferometerusedto2x2coupler，thefeasibilityoflaserultrasoundstablydetectingWasdemonstratedbyanewtypefiberMichelsoninterferometerwith3x3couplerinthispaperFirstly

4、theadvantagesisdiscussedAndthenthedesignandexecutionwereintroducedofthelaserandtheservomochanismusedinthisexlmimemAndanewmethodwasbroughtforwardtomeasurephaseshiftofmepiezoelectricphasemodulatorwhichismoreexactlyandablet

5、oreiterate∞comparedwithtraditionalmethodsAnexperimentsystemhasbeendesignedandaphase—shiftcoefficientWaSgottenofonekindofPZTusedintheservomechanismoffiberMichelsonintefferometerAtlast，ultrasoundvibrationdetectionexperimen

6、twasdemonstratedbythefiberMiehelsoninterferometerwith3x3couplertheresultsshowsthat，thenewinterferometerisabletodetectCWandpulseultrasoundvibrationwellKEYWORBS：fiberopticMichel裂3ninterferometer；laserultrasound；3x3coupler；