高精度干涉仪的相干噪声抑制技术研究

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1、密级．无７４分类号ＴＨ１＇ＸＩＡＮＴＥＣＨＮＯＬＯＧＩＣＡＬＵＮＩＶＥＲＳＩＴＹ硕士学位论文题目：高精度干涉仪的相干噪声抑制技术研究作者：张佳莹指导教师：王红军副教授申请学位学科：光学工程２０１８年５月２７日＊密级无分类号TH741XI’ANTECHNOLOGICALUNIVERSITY硕士学位论文题目:高精度干涉仪的相干噪声抑制技术研究作者：张佳莹指导教师：王红军副教授申请学位学科：光学工程2018年5月27日涉图像的条纹对比度和噪声对比度都随之下降，旋转速度在50r/s时，图像信噪比达到峰值，说明干涉图像的降噪效果处于最佳状态

2、。关键词：菲索干涉；相干噪声；条纹对比度；噪声对比度；SNRbasicprincipleofinterferencefringessuppressionwasanalyzedindetail.Wedelvedintotheopticalmodulationtheoryoffrostedglass,includingthetheoryofmodulationofroughsurfaceandrotationspeedtolaserbeam.Wealsosimulatedtheinfluencecausedbysurfaceroughnessandrotationspeedonnoisesup

3、pressioneffectofinterferenceimage.Secondly,webuiltthenoisesuppressionsystembasedonFizeauinterference,andexpoundedtheprocessingflowoftheinterferenceimage.Wealsotestedtheinfluencecausedbysurfaceroughnessandrotationspeedonnoisesuppressioneffectofinterferenceimageanddesignedthecorrelationalgorithmtoca

4、lculatethefringecontrastofinterferenceimage,thenoisecontrastandimageSNR,thencomparedthemwiththesimulationresults,andcomparationshowedgoodconsistency.Theexperimentalerrorwasanalyzeddetailedlyattheendofthepaper.Finally,theresultsofsimulationandexperimentshowedthatwhenthenoisereductionexperimentwasca

5、rriedoutintheinterferencesystem,thesurfaceroughnessandwavelengthratioofthefrostedglassshouldbecontrolledintherangeof0.2to0.6.Thefrostedglasshasgoodnoisereductionperformanceandnoisesuppression.Butinactualoperation,weshouldproperlyreferencetheparametersofrotationspeed,becausetheincreaseoftherotation

6、alspeedoffrostedglasscandecreasethefringecontrastandthenoisecontrastoftheinterferenceimage.Whentherotationspeedisat50r/s,theimageSNRisatitspeak,whichmeansthenoisereductioneffectoftheinterferenceimageisinthebestcondition.Keywords:Fizeauinterferometry;coherentnoise;fringecontrast;noisecontrast;SNR目录

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