基于面阵式探测器连续太赫兹波三维层析成像  

A continuous-wave terahertz 3-D computed tomography using a pyroelectric array detector

作　　者：李斌[1] 王大勇[1,2] 周逊[3,4] 戎路[1,2] 李赜宇[3,4] 李磊[3,4] 黄昊翀 万敏[1] 王云新[1,2] LI Bin;WANG Dayong;ZHOU Xun;RONG Lu;LI Zeyu;LI Lei;HUANG Haochong;WAN Min;WANG Yunxin(College of Applied Sciences;Beijing Engineering Research Center of Precision Measurement Technology and Instruments,Beijing University of Technology, Beijing 100124, China;Research Center of Laser Fusion,China Academy of Engineering Physics,Chengdu Sichuan 610041,China;Microsystem and Terahertz Research Center,China Academy of Engineering Physics, Chengdu Sichuan 610200,China)

机构地区：[1]北京工业大学应用数理学院,北京100124 [2]北京工业大学北京市精密测控技术与仪器工程技术研究中心,北京100124 [3]中国工程物理研究院激光聚变研究中心,四川成都610041 [4]中国工程物理研究院微系统与太赫兹研究中心,四川成都610200

出　　处：《太赫兹科学与电子信息学报》2017年第1期21-25,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(61675010;1475011;61307010);北京市教委科技重点资助项目(KZ201610005008);中国工程物理研究院太赫兹科学技术基金资助项目(201406);日新人才和中央支持地方专项配套项目

摘　　要：太赫兹波层析成像技术是利用太赫兹波的穿透性对样品进行旋转投影数据采集,通过层析重建算法获得样品的二维横截面图,并实现样品的三维内部结构图的重构。本文介绍了基于面阵式探测器连续太赫兹波层析成像系统。该成像系统的优势在于利用了面阵式探测器记录二维投影数据,相比扫描层析成像系统,提高了投影采集速率。为了获得高精确度的二维投影数据,利用角谱衍射传播算法将二维投影图传播至样品后表面,实现抑制太赫兹波在物体外部衍射效应,最终利用滤波反投影算法重建出高保真的样品三维内部结构图,并进一步探索了基于面阵式探测器的连续太赫兹波层析成像技术在无损检测和安全检测上的可行性。Terahertz computed tomography makes use of the penetrability of terahertz radiation and obtains three-dimensional(3-D) object projection data. In this paper, continuous-wave terahertz computed tomography using a pyroelectric array detector is presented. Compared with scanning terahertz computed tomography, a pyroelectric array detector can obtain a large quantity of projection data in a short time. To obtain a high precision two-dimensional(2-D) projection data, the two-dimensional projection data is propagated by angular spectrum algorithm; then the diffraction effects are suppressed on external sample.Two-dimensional cross-sectional images and three-dimensional images of the internal structure of the object are obtained by the filtered back projection algorithm. Further, the feasibility of terahertz computed tomography is explored in non-destructive testing and security testing.

关 键 词：太赫兹波成像 层析成像 面阵式 三维成像 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O441.4[自动化与计算机技术—计算机科学与技术]