隐藏腐蚀脉冲太赫兹无损检测的建模与分析  

Modeling and Analysis for Pulsed Terahertz Nondestructive Testing of Hidden Corrosion

作　　者：张雯[1] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191

出　　处：《无损检测》2009年第10期790-795,共6页Nondestructive Testing

基　　金：国家自然科学基金资助项目(50777002)

摘　　要：研究了飞机涂层下方隐藏腐蚀脉冲太赫兹检测的电磁建模与分析问题。使用麦克斯韦方程组的轴对称形式建立时域微分方程数学模型,应用时域有限元法求解,给出了数值算例,模拟了在不同缺陷参数下涂有电介质的导体对入射脉冲太赫兹波的响应,并归纳了响应在空间上和时间上的变化规律。结果显示,该方法可以用于分析和预测脉冲太赫兹检测过程中的电磁现象,并且为进一步发展脉冲太赫兹无损检测技术提供了一定的理论依据。This paper discusses electromagnetic modeling and analysis for pulsed terahertz （THz） testing of hidden corrosion under aircraft coating. A time domain differential equation model is established by using the axisymmetrical form of the Maxwell＇s equations, and the finite element time domain（FETE）） method is applied to solve the model. In numeric examples, the responses of coated conductors with different defect size to incident THz pulse are obtained, and the variations of responses in space and time are summarized respectively. Results show this method can be used for analysis and prediction of electromagnetic phenomenon during pulsed THz testing. The paper provides some theoretical basis for the development of pulsed THz nondestructive testing technology.

关 键 词：无损检测 隐藏腐蚀 太赫兹脉冲 麦克斯韦方程组 时域有限元 

分 类 号：TG115.28[金属学及工艺—物理冶金]