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1、第40卷第4期光電工程Vol.40,No.42013年4月Opto-ElectronicEngineeringApril,2013文章編號：1003-501X(2013)04-0120-07雙光彈差頻調(diào)制型偏振光譜測量技術a,ba,ba,ba,ba,ba,b張瑞，王志斌，趙冬娥，陳友華，高婷婷，黃艷飛(中北大學a.儀器科學與動態(tài)測試教育部重點實驗室；b.山西省光電信息與儀器工程技術研究中心，太原030051)摘要：提出了一種基于雙光彈調(diào)制差頻調(diào)制和傅里葉-貝塞爾(Fourier-Bessel)變換的光譜偏振測
2、量方法，該方法將雙光彈調(diào)制器(Dual-photoelastic-modulator，Dual-PEM)分別工作在數(shù)值略有差異的頻率上，以對光進行差頻調(diào)制，并產(chǎn)生載有被測偏振信息的低頻(幾十~幾千赫茲)調(diào)制分量，普通陣列探測器就可以實現(xiàn)低頻分量的探測。通過對調(diào)制信號中的低頻成分進行傅里葉-貝塞爾變換，可得到被測光對應的Stokes矢量中Q(σ)和U(σ)的光譜。該方法降低了偏振光譜測量系統(tǒng)的復雜度。本文介紹了其原理并推導出了偏振光譜反演公式，并通過仿真和實驗驗證其可行性。關鍵詞：雙光彈調(diào)制器；Stokes矢量
3、；偏振光譜；傅里葉-貝塞爾變換中圖分類號：O436.3文獻標志碼：Adoi：10.3969/j.issn.1003-501X.2013.04.018DifferentialFrequencyModulationSpectropolarimeterMeasurementBasedonDual-photoelastic-modulatora,ba,ba,bZHANGRui，WANGZhi-bin，ZHAODong’e，a,ba,ba,bCHENYouhua，GAOTingting，HUANGYanfei(a.Ke
4、yLabofInstrumentScience&DynamicMeasurement,MinistryofEducation;b.EngineeringandTechnologyResearchCenterofShanxiProvincialforOptical－ElectricInformationandInstrument,NorthUniversityofChina,Taiyuan030051,China)Abstract:Anewdifferentialfrequencymodulationmetho
5、dbasedondual-photoelastic-modulator(dual-PEM)andFourier-Besseltransformisproposedasankeycomponentofdual-photoelastic-modulator-basedspectropolarimeter.Thedual-PEMareoperatedasanelectro-opticcircularretardancemodulator.OperatingthePEMsatslightlydifferentreso
6、nantfrequenciesω1andω2respectively,generatesadifferentialsignalatamuchlowerheterodynefrequencythatmodulatestheincidentlight.ThismethodretainstheadvantagesoftheexistingPEM,andthefrequencyofmodulatedphotocurrentisdecreasedby2~3ordersofmagnitude,whichcanbedete
7、ctedbycommonarraydetector.Theincidentlightspectropolarimeter(Q(σ)andU(σ)ofStokesparameters)canbeobtainedbyFourier-Besseltransformoflowfrequencycomponentinthemodulatedsignal.Themethodreducesthecomplexityofspectropolarimetermeasurementsystem.Thebasicprinciple
8、isintroduced,thebasicequationisderived,andthefeasibilityisverifiedthroughthecorrespondingnumericalsimulationandexperiment.Keywords:dual-photoelastic-modulator;Stokesparameters;spectropolarimeter;Fourie
