欢迎来到天天文库
浏览记录
ID:11070888
大小:320.50 KB
页数:11页
时间:2018-07-09
《(光学系统像质评价)》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ChapterXImagequalityevaluationofopticalsystem(光学系统像质评价)Introduction§10.1BrightnessofcenterdiskandRayleighJudgement(中心点亮度和瑞利判断)§10.2Resolvingpower(分辨率)§10.3Spotdiagram(点列图)§10.4Opticaltransferfunction(光学传递函数)11IntroductionTheinitialpreliminaryevaluationoftheimagequalityprovidedbyaparticular
2、systemcomefromtheblurcircleformedbyalltheraysemittedbypointobjectsindifferentfieldofview.Thisblurcircleiscalledusuallyasdiffuseddisk,spotdiagram,pointspreadfunction.1.Geometricalaberration:Thegeometricalaberrationistheresidualaberrationlessthanthetoleranceofaberrationoraccordingtothecurveo
3、faberration.Wedeterminethedimensionofdiffuseddisk.*Becauseofdiffractiongeometricalaberrationcannotdescribetheactualdistributionofenergyofapointobject.2.WavefrontaberrationRayleighcriterion(iftheimagequalityisgood;iftheimagequalityisperfect)isverysimple,itisdoesnotconsiderthedefectarea.Only
4、usedinsmallaberrationsystem.(PeaktoValley:maximumwavefrontaberration)3.Theresolvingpowerofanopticalsystemhasbeenthecriterionmostusedforthequalityoftheimage.Ithasbeenexpressedbyintermsofthemaximumnumberoflinespermillimeter.Moreover,theresolvingpowerdependsgreatlyonthecontrastinobject.4.Opti
5、calTransferFunction(OTF)OTFrepresentsthepropertyofanopticalsystemconsideredasatransmitterofspatialfrequence.*Evenanideallycorrectedsystemcanonlytransmitspatialfrequencebelowsomelimitingfrequence-cutofffrequence.11§10.1BrightnessofcenterdiskandRayleighJudgement(中心点亮度和瑞利判断)1.Brightnessofcent
6、erdiskStrehlCriterion:LetGetExpansionseriesofSample:ItcorrespondstotheRayleighcriterion.112.RayleighJudgementTheimagequalityisgoodTheimagequalityisperfectConsideringonlythemaximumwavefrontaberration,defocusingcanimprovethewavefrontaberration.(Selectthebestimageplane)Therationofthearea()tot
7、hewholeareaisnotconsidered.Theadvantageiseasytocalculate,appliedinopticalsystemwithsmallaberration,suchastelescope,microscopeobjective.Zemax:①analysis↙wavefront②windowOpd:determinethedefectarea§10.2Resolvingpower(分辨率)Resolvingpowerofasystemwillbeoftheorderof,i
此文档下载收益归作者所有