ChapterV Field stop and aperture stop英文资料

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1、ChapterVFieldstopandaperturestop视场光阑与孔径光阑5.1Fieldstopandaperturestop视场光阑与孔径光阑5.2Filedofview视场5.3Vignettingandfieldlens渐晕与场镜5.4Telecentricsystem远心系统5.5Depthoffocusanddepthoffield焦深与景深5.6Straylightinlenses透镜中的杂散光5.1Fieldstopandaperturestop一、FieldstopandaperturestopApertu

2、restop:Thestopclosetolenslimitsthesizeofthebundlesofraysofaxispoint.Itdeterminestheamountoflightreachinganygivenpointintheimage,thereforecontrolsthebrightnessofimage(imageplane).Fieldstop:Justfrontofthefocalplanelimitstheangleatwhichtheincidentbundlescangetthroughtothi

3、splane(imageplane).Itdeterminestheextentoftheobjectorthefield.(Fieldstopisusuallymadetocoincidewithimage.)二、Entrancepupilandexitpupil:Theimageofaperturestopformedbyprecedingit.:Theimageofaperturestopformedbyfollowingit.Theimageofthisstop,asformedbythelensisfoundtolieat

4、theposition.*Sinceisinsidethefocalplane,itsimageliesintheobjectspaceandisvirtualanderect,PLcalledentrancepupil.*liesintheimagespace,calledexitpupil.`*,,arepairsofconjugatedpoints.Anyrayintheobjectspacedirectedthroughoneofthesepointswillafterrefractionpassthroughitsconj

5、ugatepointintheimagespace.三、ChiefrayAnyrayintheobjectspacethatpassesthroughthecenterofentrancepupiliscalledchiefray.Afterrefractingalsopassthroughthecenteroftheexitpupil.*Chiefrayisacentralrayofobliquerays.preliminarydesignofanopticalinstrument,mustdeterminewhichoneact

6、uallydoesthelimiting?Theentrancepupilofthecentricsystemistheimageoftheaperturestopformedbyalllensesprecedingit.Theexitpupilistheimageformedbyalllensesfollowingit.四、StopbetweentwolensesChiefraypassthroughtheentrancepupil,thestopandtheexitpupil.Howtodetermineaperturestop

7、?五、 TwolenseswithnostopTheperipheryofanylensinsystemisapotentialstop.Objectatinfinity,:entrancepupil.ObjectatA,:entrancepupilDeterminationoftheaperturestopThesystemconsistsoftowlensesandastop.isthevirtualimageofthefirst()andastopformedby():VirtualimageofthestopPformedb

8、y.:Virtualimageofthestopformedby.:Virtualimageofthesecondlensformedby.ForallaxialobjectpointslyingtotheleftofX,limits