计算机辅助光学设计codeVS

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1、CODEVIntroductorySeminar:Day1“Optics101”DigitalCameraDesignStudy3280EastFoothillBoulevardPasadena,California91107USA(626)795-9101Fax(626)795-0184e-mail:service@opticalres.comWorldWideWeb:http://www.opticalres.comSection1Optics101(onaBudget)Goalsand“N

2、otGoals”Goals:BriefoverviewofbasicimagingconceptsIntroducesomelingooflensdesignersProvideresourcesforquickreferenceorfurtherstudyNotGoals:DerivationofequationsExplainallthereistoknowaboutopticaldesignExplainhowCODEVworksSignConventionsDistances:positiveto

3、rightCurvatures:positiveifcenterofcurvatureliestorightofvertexAngles:positivemeasuredcounterclockwiseHeights:positiveabovetheaxist>0t<0VCc=1/r<0VCc=1/r>0q>0q<0LightfromPhysics102Lighttravelsinstraightlines(homogeneousmedia)Snell’sLaw:nsinq=n’sinq’Paraxial

4、approximation:Smallangles:sinq~tanq~q;andcosq~1OpticalsurfacesrepresentedbytangentplaneatvertexignoresagincomputingrayheightthicknessisalwayscenterthicknessPowerofasphericalrefractingsurface:1/f=f=(n’-n)*cUsefulfortracingraysquicklyanddevelopingaberration

5、theoryCardinalPoints6importantpointsalongtheaxisofanopticalsystem2focalpoints(frontandback):inputlightparalleltotheaxiscrossestheaxisatfocalpointsFandF’2principalpoints(primaryandsecondary):extendlinesalonginputrayandexitingfocalray;wheretheyintersectde

6、finesprincipal“planes”whichintersecttheaxisattheprincipalpoints2nodalpoints(firstandsecond):raysaimedatthefirstappeartoemergefromthesecondatthesameangle.“first”pointsdefinedbyparallelraysenteringfromtheright;“second”pointsdefinedbyparallelraysenteringfrom

7、theleftCardinalPointsIllustratedEffectiveFocalLength(EFL)=distancefromprincipalpointtofocalpointP1F1F2EFLEFLApertureStopAperturestop:determineshowmuchlightentersthesystem2specialraysMarginalray:fromon-axisobjectpointthroughtheedgeofthestopChiefray:frommax

8、imumextentofobjectthroughthecenterofthestopApertureStopChiefrayMarginalrayPupilsandtheApertureStopPupilsEntrancepupil:imageofaperturestopviewedfromobjectspaceExitpupil:imageofaperturestopviewedfromimagespaceEntrance