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时间:2019-02-26
《基于太赫兹气体激光器的连续波成像系统性能分析》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、万方数据第30卷第3期2011年6月文章编号:1001—9014(2011)03—0193—04红外与毫米波学报J.InfraredMillim.WavesV01.30,No.3June,2011Performanceofthecontinuous-waveimagingsystembasedon.aterahertzgaslaserWANGYing.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基于太赫兹气体激光器的连续波成像系统性能分析王迎新1”,赵自然2,陈志强2,张丽2,康克军2,邓景康1(1.清华大学物理系,北京100084;2.清华大学工程物理系粒子技术与辐射成像教育部重点实验室,北京100084)摘要:实现了基于光泵浦远红外气体激光器和高莱管探测器的连续波太赫兹成像.从太赫兹光学器件的选择和配置角度讨论了成像系统的设计和搭建流程.详细测试了系统在信噪比、空间分辨率、探
6、测器响应和成像速度方面的性能指标.利用该系统采集了一系列样品的太赫兹透射图像,实验结果验证了系统的成像效果,揭示出太赫兹成像技术在安全检查和质量控制方面的应用可行性.为了消除激光器功率漂移对图像质量的影响,提出了一种对图像背景区强度进行自动校准的数据处理方法.‘关键词:太赫兹;连续波;成像系统;远红外激光器中图分类号:0439文献标识码:AIntroductionTerahertzradiation,lyingbetweenthemillimeterwavesandinfrared(0.1—10THz),hasgoodpenetra-bilitytomostnonmetallicandnon—
7、polarmaterials.Thisabilitymakesterahertzradiationaneffectiveandcorn·plementaryimagingsourceforrevealingthestructureinformationoftheobject.SincethefirstdemonstrationofpulsedterahertzimagingsystembyHuan
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