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1、第40卷第4期光电工程Vol.40,No.42013年4月Opto-ElectronicEngineeringApril,2013文章编号：1003-501X(2013)04-0120-07双光弹差频调制型偏振光谱测量技术a,ba,ba,ba,ba,ba,b张瑞，王志斌，赵冬娥，陈友华，高婷婷，黄艳飞(中北大学a.仪器科学与动态测试教育部重点实验室；b.山西省光电信息与仪器工程技术研究中心，太原030051)摘要：提出了一种基于双光弹调制差频调制和傅里叶-贝塞尔(Fourier-Bessel)变换的光谱偏振测
2、量方法，该方法将双光弹调制器(Dual-photoelastic-modulator，Dual-PEM)分别工作在数值略有差异的频率上，以对光进行差频调制，并产生载有被测偏振信息的低频(几十~几千赫兹)调制分量，普通阵列探测器就可以实现低频分量的探测。通过对调制信号中的低频成分进行傅里叶-贝塞尔变换，可得到被测光对应的Stokes矢量中Q(σ)和U(σ)的光谱。该方法降低了偏振光谱测量系统的复杂度。本文介绍了其原理并推导出了偏振光谱反演公式，并通过仿真和实验验证其可行性。关键词：双光弹调制器；Stokes矢量
3、；偏振光谱；傅里叶-贝塞尔变换中图分类号：O436.3文献标志码：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
