天津大学工程光学第4章 总结与习题课件.ppt

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1、第4章总结专业英语知识要点HanQunar@TJU2012年5月28日13:54:591专业英语SomekeywordsandconceptsStops(aperture~,field~)areeitherthefinitesizeofthelensesoradditionaldiaphragms(光圈)whichlimitthebundleoflightpassingthroughtheopticalsystem.Pupils(entrance~,exit~)Theentrancepupilistheimageoftheapertu

2、restopwhenviewedfromthefrontofthelens.Theimageoftheaperturestopintheimagespaceiscalledtheexitpupil.Chief/Principalray,marginalrayWindows(entrance~,exit~)Fieldofview(linear~,angular~)angleofviewHanQunar@TJU2012年5月28日13:55:002专业英语SomekeywordsandconceptsVignettingIfraybund

3、lesfromallpointsinthefieldofviewfilltheaperturestopentirelyandarenottruncatedorclippedbyaperturesforeoraftofthestopthenthereisnovignettinginthesystem.Atelecentriclensisacompoundlenswhichhasitsentranceorexitpupilatinfinity.Thismeansthatthechiefrays(rayswhichpassthroughth

4、ecenteroftheaperturestop)areparalleltotheopticalaxisinfrontoforbehindthesystem,respectively.Thesimplestwaytomakealenstelemetricistoputtheaperturestopatoneofthelens'sfocalpoints.Anentrancepupilatinfinitymakesthelensobject-spacetelecentric.Anexitpupilatinfinitymakesthelen

5、simage-spacetelecentric.Ifbothpupilsareatinfinity,thelensisdoubletelecentric.HanQunar@TJU2012年5月28日13:55:013专业英语1.SomekeywordsandconceptsFieldlens:Lensesthatlocatedeitherintheimageplaneorveryclosetoitarecalledfieldlenses.Theprimarypurposeofapositivefieldlensistoreduceor

6、eliminatethevignettinginthesystem.DepthoffieldBlursportNormalviewingdistanceHanQunar@TJU2012年5月28日13:55:0242.EnglishhomeworkAstop8mmindiameterisplacedhalfwaybetweenanextendedobjectandalarge-diameterlensof9cmfocallength.Thelensprojectsanimageoftheobjectontoascreen14cmawa

7、y.Whatisthediameteroftheexitpupil?l’-lImageLensStopObjectHanQunar@TJU2012年5月28日13:55:0452.EnglishhomeworkTwolenses,alensof12.5cmfocallengthandaminus(negative)lensofunknownpower,aremountedcoaxiallyand8cmapart.Thesystemisafocal,thatislightenteringthesystemparallelatonesid

8、eemergesparallelattheother.Ifastop15mmindiameterisplacedhalfwaybetweenthelenses:1)Whereistheentrancepupil?2)Wh