一种改进的太赫兹主动成像系统

南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (5): 787–.

一种改进的太赫兹主动成像系统

那宏越，周德亮，姜寿禄，盖之慧，李先峰，陈　健*，吴培亨

出版日期:2016-09-24 发布日期:2016-09-24
作者简介: 南京大学超导电子学研究所，南京，210093
基金资助:
基金项目：国家973计划(2014CB339800)，国家自然科学基金(61521001，11173015)
收稿日期：2016－04－12
*通讯联系人，Email：chenj63@nju.edu.cn

An improved active terahertz imaging system

Na Hongyue，Zhou Deliang，Jiang Shoulu，Gai Zhihui，Li Xianfeng，Chen Jian*，Wu Peiheng

Online:2016-09-24 Published:2016-09-24
About author: Research Institute of Superconductor Electronics，Nanjing University，Nanjing，210093，China

摘要/Abstract

摘要： 利用卡塞格伦反射镜组自行搭建了一套反射式太赫兹主动成像系统，以商用肖特基二极管探测太赫兹信号，进行室温下的太赫兹快速成像．系统采用二维旋转式扫描，相较于光栅扫描，其扫描速度得到了大幅提高．通过大量实验发现该太赫兹成像系统，仅对铜柱成像效果较好，对其他物体成像效果不佳，甚至无法成像．通过对其可能存在的问题进行分析，利用数学建模的方法重新构建系统扫描轨迹，解决了成像物体形变的问题．此外，采用狄洛尼三角剖分算法对采集的数据点进行插值运算，进一步改善了系统的成像质量．实验结果表明，改进后的太赫兹主动成像系统不仅成像结果形变小，而且对一些复杂结构的物体，仍能获得较好的成像效果，对于促进该系统应用于安检等领域有着重要的意义．

Abstract: The reflectionmode terahertz active imaging system with a Cassegrain reflector has been constructed.A commercial Schottky diode is utilized in the system to detect the reflected terahertz signal and realize rapid imaging at room temperature.The system adopts 2D rotating scanning.Compared with the raster scanning，the scheme can substantially increase the scanning speed of the system.It is found from the experiment that the system can get clear images only when the objects are copper sticks.However，for the other objects，the system is not effective enough so that sometimes the clear images cannot be obtained.In this paper，the possible reasons for its poor image quality is analyzed.Firstly，the method of the mathematical modeling on the basis of the theory of optical reflection is employed to reconstruct a scanning trajectory.The method can solve the deformation of the terahertz images，because the calculated trajectory is much more consistent with the actual one compared with reported method.Secondly，in order to optimize the quality of the images without the sacrifice of scanning time，the Delaunay triangle algorithm is proposed to demodulate data and thus improve image quality.Our experiments show that a higher image quality can be achieved from the improved imaging system.Specifically，the terahertz images have little deformation for the copper sticks.Even for the objects with complex structures，acceptable image quality can be obtained.Moreover，it is meaningful to apply the improved terahertz active imaging system to practical fields，including the security checking，nondestructive evaluation，etc.

那宏越，周德亮，姜寿禄，盖之慧，李先峰，陈　健*，吴培亨. 一种改进的太赫兹主动成像系统[J]. 南京大学学报(自然科学版), 2016, 52(5): 787–.

Na Hongyue，Zhou Deliang，Jiang Shoulu，Gai Zhihui，Li Xianfeng，Chen Jian*，Wu Peiheng. An improved active terahertz imaging system[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(5): 787–.

参考文献

[1]　John F F，Brian S，Feng H，et al.THz imaging and sensing for security applications—explosives，weapons and drugs.Semiconductor Science and Technology，2005，20(7)：S266.
[2] 赵国忠．太赫兹光谱和成像应用及展望．现代科学仪器，2006，2：36－40.(Zhao G Z．Application and outlook of THz spectroscopy and imaging.Modern Scientific Instruments，2006，2：36－40.)
[3] Christian A W，Wolff von S，Ralf H，et al.Fast active THz cameras with ranging capabilities.Journal of Infrared，Millimeter，and Terahertz Waves，2009，30(12)：1281－1296.
[4] 张存林，牧凯军．太赫兹波谱与成像．激光与光电子学进展，2010，2：1－14.(Zhang C L，Mu K J．Terahertz spectroscopy and imaging.Laser & Optoelectronics Progress，2010，2：1－14.)
[5] 谢　巍，侯丽伟，潘　鸣．被动太赫兹成像二维扫描技术．太赫兹科学与电子信息学报，2014，2：176－179.(Xie W，Hou L W，Pan M．2D scanning technology in passive terahertz imaging.Journal of Terahertz Science and Electronic Information Technology，2014，2：176－179.)
[6] 成彬彬，李慧萍，安健飞等．太赫兹成像技术在站开式安检中的应用．太赫兹科学与电子信息学报，2015，6：843－848.(Cheng B B，Li H P，An J F，et al.Application of terahertz imaging in standoff security inspection.Journal of Terahertz Science and Electronic Information Technology，2015，6：843－848.)
[7] 赵军凯．调频连续太赫兹波成像的信号探测与采集系统设计．硕士学位论文．重庆：重庆大学，2013.(Zhao J K．Design of signal detection and acquisition system for FMCW THz imaging.Master Dissertation.Chongqing：Chongqing University，2013.)
[8] 乔灵博，王迎新，赵自然等．主动式近距离太赫兹人体安检技术分析．微波学报，2015，4：93－96.(Qiao L B，Wang Y X，Zhao Z R，et al.Analysis of active nearfield terahertz imaging for personnel surveillance.Journal of Microwaves，2015，4：93－96.)
[9] Grossman E N，Gordon J，Novotny D，et al.Terahertz active and passive imaging.In：The 8th EuropeanConference on Antennas and Propagation(EuCAP 2014)．The Hague：IEEE Press，2014，2221－2225.
[10] Wolff von S，Christian am W，Ral H，et al.Illumination aspects in active terahertz imaging.IEEE Transactions on Microwave Theory & Techniques，2010，58(7)：2008－2013.
[11] Ortolani M，Giovine E，Gaspare A D，et al.Perspectives in the design of monolithic focal plane arraysfor terahertz active spectroscopic imaging.In：The 35th International Conference on Infrared Millimeter and Terahertz Waves(IRMMWTHz)．Rome：IEEE Press，2010，1－3.
[12] Kulik L，Antonov V，Giblin S，et al.Towards passive terahertz imaging using a semiconductor quantum dotsensor.In：The 32nd International Conference on Infrared and Millimeter Wavesand the 15th International Conference on Terahertz Electronics.Cardiff：IEEE Press，2007，358－359.
[13] 张　馨，赵源萌，邓　朝等．被动式太赫兹图像目标检测研究．光学学报，2013，2：83－88.(Zhang X，Zhao Y M，Deng C，et al.Study on the passive terahertz image target detection.Acta Optica Sinica，2013，2：83－88.)
[14] 孙振龙，涂学凑，姜　奕等．基于自制太赫兹检测器的快速成像系统．中国激光，2014，8：252－255.(Sun Z L，Tu X C，Jiang Y，et al.Fast imaging system based on selfmade terahertz detector.Chinese Journal of Lasers，2014，8：252－255.)
[15] 李　金．多普勒直接探测激光测风雷达接收光学系统研究．硕士学位论文．哈尔滨：哈尔滨工业大学，2013.(Li J．Study on direct detection doppler wind lidar receive optical system.Master Dissertation.Harbin：Harbin Institute of Technology，2013.)
[16] John D K，Ronald J M．天线．章文勋译．北京：电子工业出版社，2011，199－202.(John D K，Ronald J M．Antennas.Beijing：Publishing House of Electronics Industry，2011，199－202.)
[17] 刘银年.45°镜多元探测器并扫成像特性和扫描轨迹分析．光学精密工程，2002，1：110－115.(Liu Y N．Analysis of imaging characteristics and scanning traces of 45° rotating scanning mirror.Optics and Precision Engineering，2002，1：110－115.)
[18] 潘汉军，刘　娅．光线反射过程的矩阵表达方法．应用光学，2004，4：9－13.(Pan H J，Liu Y．Matrix method to express the reflecting process of beam.Journal of Applied Optics，2004，4：9－13.)
[19] 贾　亮．图像超分辨率重建技术研究．硕士学位论文．南京：南京航空航天大学，2008.(Jia L．Research on image superresolution reconstruction.Master Dissertation.Nanjing：Nanjing University of Aeronautics and Astronautics，2008.)
[20] 王　海，陈国良，黄心渊．狄洛尼三角剖分在LOD点删除简化中的应用探讨．计算机应用与软件，2007，12：29－31.(Wang H，Chen G L，Huang X Y．LOD vertex deletion simplification operation based on delaunay triangulation.Computer Applications and Software，2007，12：29－31.)
[21] 余　杰，吕　品，郑昌文．Delaunay三角网构建方法比较研究．中国图象图形学报，2010，8：1158－1167.(Yu J，Lv P，Zheng C W．A comparative research on methods of delaunay triangulation.Journal of Image and Graphics，2010，8：1158－1167.)

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