BWO连续太赫兹波成像检测  

Nondestructive Testing Based on Backward Wave Oscillator Continue Terahertz Wave Imaging System

作　　者：袁宏阳[1] 葛新浩[1] 张存林[1] 

机构地区：[1]北京市太赫兹波谱与成像重点实验室太赫兹光电子学教育部重点实验室,首都师范大学物理系,北京100048

出　　处：《大气与环境光学学报》2009年第6期456-461,共6页Journal of Atmospheric and Environmental Optics

基　　金：国家重点基础研究发展计划基金项目(2007CB310408);(2006CB302901);北京市人才强教项目和国家自然科学基金项目(10390160)资助

摘　　要：返波管(BWO)连续太赫兹波成像方法是一种新的无损检测方法。实验过程中把样品放在X-Z二维电控平移台上进行扫描成像,透过样品的太赫兹波强度信息由热释电探测器接收,再经由电脑成像。给出了应用0.71 THz的连续太赫兹波对打孔铝板、公交卡、校园卡的内部结构和对隐藏在信封内的硬币等物体和信封内纸片上的铅字迹的成像实验研究事例,并且测知该系统能够分辨出最小直径为1.5 mm的小孔。并且对成像图像进行了数字图像处理,结论表明,优化处理后的图像更加直观明显,提高了连续波成像的应用能力.揭示了BWO连续太赫兹波成像系统在无损检测和安检领域是实际有效的。Abstract： The terahertz（THz） imaging system with a backward wave oscillator（BWO） is a new approach to nondestructive testing. The sample is placed on an X-Z two-dimensional stage controlled by a computer. The intensity information of the terahertz wave after passing sample is collected by a pyroelectric detector, and then it can image by the computer. A number of potential imaging applications are demonstrated using the 0.71 THz radiation, including nondestructive real-time testing for plastic bus fare card, campus debit card and various articles contained in an envelop. The spatial resolution ability of the system is measured to be 1.5 mm And the digital image processing is presented based on the result of the imaging system. The conclusion indicates that the image results are more distinct, after the optimization, which can improve the ability of continuous wave imaging technology. The results reveal that the BWO THz imaging system is very practical and effective in nondestructive identification and security inspections applications in future.

关 键 词：无损检测 BWO连续太赫兹波成像 返波管 数字图像处理 

分 类 号：TH878[机械工程—仪器科学与技术]