应用光学 英文版 chapter 5.ppt

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1、Stop:光阑fieldofview:视场vigetting:渐晕Telecentricsystem:远心光路系统Chapter5SelectionofImageRaysinOpticalSystemsStop：anopeningaperturewhosecenterisattheopticaxis.Stops,Pupils,andWindowsApertureStopFieldstoplimittheimagingraysinsystem.Lens:limitstheamountoflightwhichcanpa

2、ssthroughthesystemlensfilmFilm:limitstheimagingrange.stopApertureStop,EntrancePupil,ExitPupil(孔径光阑,入瞳,出瞳)ApertureStop:theopeninginanopticalsystemthatlimitstheamountoflightthroughthesystemsentoutfromaxialpointontheobject.EntrancePupil:theaperturestop’simageinob

3、jectspace.ExitPupil:theaperturestop’simageinimagespace.§5.1ApertureStopExam.1locatingtheaperturestopandpupils.AperturestopAperturestopTheaperturestopcanbereplacedbyaholelocatedattheentrancepupil.Entrancepupil(virtualimage)P’P”Exitpupil(virtualimage)Inimagespac

4、etheaperturestopandlensisreplacedbytheexitpupil.EntrancePupilExitPupilconjugateApertureStopconjugateconjugateThesysteminfrontofaperturestopThesysteminbackofaperturestopThewholesystemchiefray：araypassingthroughthecenteroftheaperturestop.Thechiefraypassesthrough

5、thecenteroftheaperturestop,entrancepupil,exitpupilAperturestopExitpupilEntrancepupilEntrancewindow(入射窗,简称“入窗”)Exitwindow(出射窗,简称出窗)fieldstop:Itlimitstheimagingrange.§5.2Thefieldstop(视场光阑)ObjectplaneFieldstopandentrancewindowExitwindow(出射窗,简称出窗)FieldstopExitwind

6、owAngularfieldofview(视场角):theanglewhichtheentrancewindowsubtendsfromthecenterofentrancepupil.2ymaxAngularfieldofviewVignetting(渐晕)A0B0B0C0A0A0AABAper.stopFieldStopClearapertureofAper.stopClearapertureofField.stopCommonapertureoftwostopsABCDAD0C0B0A0ExitpupilEx

7、itwindowThevignettingwillincreaseasthefieldangleofviewincreases.Effectofthevignetting:Ifasystemhasthevignetting,therewillbeatransitionareaintheimageplane,changingfrombrighttodim,withoutaclearborderline.Reducingthevignetting:Thefieldstopmustcoincidewithorbenear

8、therealimageplaneofthesystem.Vignettingcoefficient/factor(渐晕系数):linearvignettingcoefficientDωDaxialAreavignettingcoefficient5.3SelectionofImagingRaysinaApparatusEnt.pup.Ex.pup.Eye-