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1、第23卷第6期光學(xué)精密工程Vo1.23No.62015年6月OpticsandPrecisionEngineeringJun.20l5文章編號1004924X(2015)06—150808激光外差探測對振動目標(biāo)多普勒頻譜成像劉立生,張合勇,王挺峰,郭勁,陳長春(中國科學(xué)院長春光學(xué)精密機械與物理研究所激光與物質(zhì)相互作用國家重,實驗室,吉林長春130033)摘要:提出了采用激光外差技術(shù)探測振動目標(biāo),獲取目標(biāo)多普勒頻譜圖像,實現(xiàn)目標(biāo)輪廓識別的方法?;谙辔蛔兓o出了目標(biāo)振動形成外差信號的光電流模型;用掃描振鏡控制激光光束方向?qū)崿F(xiàn)對目標(biāo)點掃描;通過振鏡驅(qū)動電壓觸發(fā)數(shù)據(jù)采集卡,實現(xiàn)掃描與采集
2、同步。利用頻譜展寬占有比例的信號處理方式處理振動目標(biāo)形成的多普勒頻譜,簡化了數(shù)據(jù)處理方式,有效消除了單個峰值噪聲對信號的影響。實驗中以5MHz采樣率測得兩個日標(biāo)在不同位置的特征頻譜,得到了它的頻譜展寬占有比例曲線;選取不同頻譜展寬占有比例形成多普勒頻譜圖像,指出頻譜展寬占有比例在0.7到0.9時能夠形成良好的振動圖像。文中結(jié)果證實了利用頻譜展寬占有比例的數(shù)據(jù)處理方式探測振動目標(biāo)是有效的,利用外差技術(shù)獲取振動頻譜圖像是可行的。關(guān)鍵詞:激光外差探測;振動目標(biāo)探測;多普勒頻譜成像;目標(biāo)識別中圖分類號:0436.1;TN247文獻標(biāo)識碼:Adoi:10.3788/OPE.20152306.
3、1508DopplerspectrumimagingofvibratingtargetusinglaserheterodynedetectionIIULi—sheng,ZHANGHe—yong,WANGTing—feng,GUOJin,CHENChang—qing(StateKeyLaboratory0/LaserInteractionwithMatter,ChangchunInstituteofOptics,F(xiàn)ineMechanicsandPhysics,ChineseAcademyofSciences,Changchun130033,China)*CDr】ep07zgautho
4、r,E-mail:liuls@ciomp.“(’.cnAbstract:Torecognizetheprofileofavibratingtarget,theDopplerspectralimageofthetargetwascapturedbyusingthe1aserheterodynedetectionmethod.Aphoto—currentmodeloflaserheterodynesignalfromthevibratingtargetwasderivedbasedontheinstantchangingofphase,thetargetwasscannedpointb
5、ypointinthelaserdirectioncontrolledbyascanninggalvanometer,andthedatacollectionwassynchro—controlledbythedrivevoltageofthegalvanometertosynchronizedatascanninganddatacapturing.AmethodcalledtheRatioinBroadenSpectrum(RIBS)tovibrationsignalprocessingwasproposedtoprocesstheDopplerspectrumcomefromt
6、hevibrationsignalbywhichthedataprocessingwassimplifiedandtheeffectofpeaknoiseonthesignalwaseliminated.Thecharacteristicspectraoftwotargetsindifferentpositionsweredetectedata5MHzsamplingrateintheexperimenttoderivetheRIBScurve,andDopplerspectrumimagingwascapturedwithdifferentRIBS,whichshowthatwh
7、entheoptimalratioissetfrom0.7to0.9,thehighqualityvibrationimage收稿日期:201407—07;修訂日期:2014—08一l9.基金項目:國家自然科學(xué)基金資助項目(No.61205143)第6期劉立生,等:激光外差探測對振動目標(biāo)多普勒頻譜成像canbeobtained.TheresultdemonstratesthevalidityoftheRIBSinvibratingtargetdetectionandt