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1、萬(wàn)方數(shù)據(jù)第30卷第3期2011年6月文章編號(hào):1001—9014(2011)03—0193—04紅外與毫米波學(xué)報(bào)J.InfraredMillim.WavesV01.30,No.3June,2011Performanceofthecontinuous-waveimagingsystembasedon.a(chǎn)terahertzgaslaserWANGYing.Xinl”,ZHAOZi.Ran2,CHENZhi.Qian92,ZHANGLi2,KANGKe.Jun2,DENGJing—Kan91(1.DepartmentofPhysics,TsinghuaUniversity,Beijing100084
2、,China;2.DepartmentofEngineeringPhysics,TsinghuaUniversity,KeyLaboratoryofParticle&RadiationImaging,MinistryofEducation,Beijing100084,China),Abstract:Continuous—waveterahertzimagingWa$demonstratedbasedonalloptically·pumpedfar·infraredgaslaserandaGolaycelldetector.Theimagingsystemdesignandconstructio
3、narediscussedinthecontextofthechoiceandconfigurationoftheinvolvedterahertzopticalcomponentsanddevices.Performancecharacteristicsofthesystem,includingsignal·to—noiseratio,spatialresolution,detectorresponseandimagingspeedweremeasuredandanalyzedindetail.Withthissys-tern,terahertztransmissionimagesofvar
4、ioussampleswel'eobta/ned,confirmingthequalityofoursetupandsupportingthefeasibilityofterahertzimagingtechniqueforapplicationsinsecurityscreeningandqualitycontr01.AdataprocessingmethodforautomaticcalibrationoftheimageintensitiesinthebackgroundregionWasalsoproposedtoremovetheinfluenceoflaserpowerdrifto
5、ntheimagequality.Keywords:terahertz;continuouswave;imagingsystem;far—infraredlaserPACS:42.30.Va.42.62.cf基于太赫茲氣體激光器的連續(xù)波成像系統(tǒng)性能分析王迎新1”,趙自然2,陳志強(qiáng)2,張麗2,康克軍2,鄧景康1(1.清華大學(xué)物理系,北京100084;2.清華大學(xué)工程物理系粒子技術(shù)與輻射成像教育部重點(diǎn)實(shí)驗(yàn)室,北京100084)摘要:實(shí)現(xiàn)了基于光泵浦遠(yuǎn)紅外氣體激光器和高萊管探測(cè)器的連續(xù)波太赫茲成像.從太赫茲光學(xué)器件的選擇和配置角度討論了成像系統(tǒng)的設(shè)計(jì)和搭建流程.詳細(xì)測(cè)試了系統(tǒng)在信噪比、空間分辨率、探
6、測(cè)器響應(yīng)和成像速度方面的性能指標(biāo).利用該系統(tǒng)采集了一系列樣品的太赫茲透射圖像,實(shí)驗(yàn)結(jié)果驗(yàn)證了系統(tǒng)的成像效果,揭示出太赫茲成像技術(shù)在安全檢查和質(zhì)量控制方面的應(yīng)用可行性.為了消除激光器功率漂移對(duì)圖像質(zhì)量的影響,提出了一種對(duì)圖像背景區(qū)強(qiáng)度進(jìn)行自動(dòng)校準(zhǔn)的數(shù)據(jù)處理方法.‘關(guān)鍵詞:太赫茲;連續(xù)波;成像系統(tǒng);遠(yuǎn)紅外激光器中圖分類(lèi)號(hào):0439文獻(xiàn)標(biāo)識(shí)碼:AIntroductionTerahertzradiation,lyingbetweenthemillimeterwavesandinfrared(0.1—10THz),hasgoodpenetra-bilitytomostnonmetallicandnon—
7、polarmaterials.Thisabilitymakesterahertzradiationaneffectiveandcorn·plementaryimagingsourceforrevealingthestructureinformationoftheobject.SincethefirstdemonstrationofpulsedterahertzimagingsystembyHuan