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1、第32卷第8期光學學報Vo1.32,No.82O12年8月ACTAOpTICASINICAAugust,2012高分辨率制冷型中波廣角紅外成像系統(tǒng)的光學設計楊勝杰(中國航空工業(yè)集團公司洛陽電光設備研究所,河南洛陽471009)摘要設計了一個F數(shù)為2,工作波段為3.7~4.8Fm,全視場2co一111.2。的高分辨率制冷型中波廣角紅外成像光學系統(tǒng)。該系統(tǒng)采,~j-次成像構(gòu)型,通過Si、Ge、ZnSe三種材料六片式對稱布局,利用折/衍混合器件及非球面,實現(xiàn)了光學被動消熱差設計,使系統(tǒng)在一55℃至+80C的寬溫范
2、圍內(nèi),在空間頻率為33lp/mm處的光學傳遞函數(shù)(MTF)均大于0.4,系統(tǒng)在15m的像素尺寸內(nèi),能量集中度大于70%0;采用口設計,使成像系統(tǒng)對不同視場具有相同的角分辨率;通過引入光闌像差和控制像方視場角,使像面具有較好的均勻性,邊緣視場最低相對照度為中心視場的90.9,且具有近100的冷光闌效率,同時,系統(tǒng)具有較好的冷反射抑制效果,該光學系統(tǒng)適用于像素為15,分辨率為640pixel×512pixel的中波制冷探測器。關(guān)鍵詞光學設計;廣角紅外鏡頭;消熱差;折/衍混合系統(tǒng);冷反射中圖分類號TN216文獻標
3、識碼Adoi:10.3788/AOS201232.0822003OpticalDesignforHighResolutionCooledMid.WavelengthInfraredWide-AngleImagingSystemYangShengjie(LuoyangResearchInstituteofElectro—OpticalEquipment,AviationIndustryCorporationofChina,Luoyang,Henan471009,China)AbstractAnopticals
4、ystemofmid-wavelengthinfraredforhighresolutioncooledwide.a(chǎn)ngleimagingsystemisdesigned.TheF—numberofthesystemiS2andfullfieldofview(FOV)2∞一111.2。.Thesystemchoosesadoubleimagingconfiguration.Byintroducingandiffractiveopticalelement,settingasphericsurfacesands
5、ymmetricallydistributingthreetypesofmaterialSi,GeandZnSewith6elements,thesystemisathermalizedacrossawidetemperaturerangefrom一55℃to+80℃andtheopticalaberrationiswellbalanced.Intheathermalizedtemperaturerange,themodulation—transferfunction(MTF)ishigherthan0.4
6、at33lp/mm,andthediffractiveradialenergyismorethan7O%inacircleof15um.Basedontheprincipleoff-0lens,thewide-anglesystemgetsthesameangularresolutionfordifferentfields.ByintentlyintroducingstopaberrationandspecificallycontrollingtheFOVinimagingspace,thefocalpla
7、negetsaverygoodilluminationuniformity,therelativeilluminationofoff—axisfieldismore9O.9%andtheefficiencyofthecoldstopiSalmost1OO%.Moreover,thenarcissusofthesystemiScontrolledverywelI.ThissystemiSsuitableforhighresolutioncold640pixel×512pixeldetectorwithpixe
8、lsizeof15“m.Keywordsopticaldesign;wide—angleinfraredlens;athermalization;hybridrefractive/diffractiVesystem;narcissusOCIScodes220.3620;050.1970:040.30601引言“實時”信息獲取的需求及進展,報道了其長波非制冷焦平面陣列的魚眼系統(tǒng)成像效果和中波制冷型魚隨著紅外探測器的