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1、第41卷第2期光電工程Vo1.41.No.22014年2月Opto—ElectronicEngineeringFeb,2014文章編號:1003—501X(2014)02—0075—06高分辨率長波紅外連續(xù)變焦光學(xué)系統(tǒng)設(shè)計包佳祺,吉紫娟2,葛振杰,李楠。,俞侃,尹娟娟(1.華中科技大學(xué)文華學(xué)院,武漢430074;2.湖北第二師范學(xué)院,武漢430205;3.武漢振光科技有限公司,武漢430070)摘要:針對高分辨率640x512元非制冷探測器,設(shè)計了一款6×長波紅外連續(xù)變焦光學(xué)系統(tǒng)。該系統(tǒng)由6片透鏡構(gòu)成,工作波長為8~12pm,F(xiàn)數(shù)為1~1.1。根據(jù)變焦光學(xué)系統(tǒng)設(shè)計理論,確定了系統(tǒng)的機(jī)械補(bǔ)償式變
2、焦結(jié)構(gòu)并構(gòu)建了初始結(jié)構(gòu);對該系統(tǒng)的光學(xué)結(jié)構(gòu)參數(shù)及凸輪變焦曲線進(jìn)行了設(shè)計和優(yōu)化。像質(zhì)評價結(jié)果表明該系統(tǒng)在20~120m/yl焦距范圍上實(shí)現(xiàn)了連續(xù)平滑變焦;在30lp/mm空間頻率處,全焦距范圍調(diào)制傳遞函數(shù)值大于0.45,接近衍射極限;全焦距范圍各視場彌散斑均方根半徑小于6_3gm,遠(yuǎn)小于像元尺寸17pm。實(shí)驗(yàn)證明該系統(tǒng)具有高分辨率、高變倍比、大光圈、大視場范圍的特點(diǎn),且像面穩(wěn)定,變焦平滑,結(jié)構(gòu)緊湊合理,成本相對較低。關(guān)鍵詞:長波紅外;連續(xù)變焦;高分辨率;機(jī)械補(bǔ)償;高變倍比中圖分類號:TN216文獻(xiàn)標(biāo)志碼:Adoi:10.3969/j.issn.1003—501X.2014.02.012Desig
3、nofaLong-waveInfraredContinuousZoomOpticalSystemwithHighResolutionBAOJiaqi,JIZijuan,GEZhenjie,LINan,YUKan,YINJuanjuan(1.WenhuaCollege,HuazhongUniversityofScienceandTechnology,Wuhan430074,China;2.HubeiUniversityofEducation,Wuhan430205,China;3.WuhanZhenguangTechnologyCo.L融Wuhan430070.China1Abstract:Al
4、ong—waveinfraredcontinuous6xzoomopticalsystemwith640x512uncooledinfraredthermaldetectorisdesignedanddescribed.Itcontains6lensesandworksat8M2pmwavelengthwiththeF≠}of1~1.1.Basedonthetheoryofzoomopticallensesdesign,amechanicalcompensationstructureisdeterminedandtheinitialstructureparametersarecalculate
5、d.Moreover,theopticalsystemparametersandzoomcurvesaredesignedandoptimized.Theimagequalityassessmentshowsthatsystemzoomscontinuouslyandsmoothlyinall20M20mmfocuslengthensrange.TheModulationTransferFunction(MTF)valuesat30lp/mmareallabove0.45andthespotdiagrams’RMSradiusarealllessthan6.3gmwhichismuchsmal
6、lerthanthedetectorpixelsize17pminallfocuslengthsrange.Theexperimentprovesthatthiszoomsystemhasthemeritsofhighresolution,highzoomratio,bigaperture,bigfieldrange,andhassteadyimageplaneandzoomssmoothlywithcompactstructuresandlowcost.Keywords:long—waveinfrared;continuouszooms;highresolution;mechanicalco
7、mpensation;highzoomratio0引言紅外熱像儀是人們對夜間和惡劣天氣環(huán)境下遠(yuǎn)距離目標(biāo)進(jìn)行監(jiān)測、跟蹤和識別的光電儀器[¨,近年來廣泛應(yīng)用于國防、防火救災(zāi)、地質(zhì)勘探等全天候監(jiān)控領(lǐng)域,具有重大的經(jīng)濟(jì)和社會效益。紅外熱像儀具有收稿日期:2013—0701;收到修改稿日期:2013-1016基金項(xiàng)目:湖北省自然科學(xué)基金(2012FFB02701);國家自然科學(xué)基金(61205062)作者簡