文章摘要
邵伟,朱文发,范国鹏,张海燕,张辉,张梦可.多盲孔缺陷的超声兰姆波时域拓扑能量成像方法研究[J].声学技术,2021,40(5):624~629
多盲孔缺陷的超声兰姆波时域拓扑能量成像方法研究
A study of the time-domain topology energy based ultrasonic Lamb wave imaging method for multi-blind hole defects
投稿时间:2020-09-30  修订日期:2021-03-01
DOI:10.16300/j.cnki.1000-3630.2021.05.006
中文关键词: 时间反转  兰姆波  时域拓扑能量  分辨率
英文关键词: time reversal (TR)  Lamb wave  time domain topological energy (TDTE)  resolution
基金项目:国家自然科学基金青年项目(12004240)、中国博士后基金面上项目(2020M671022)。
作者单位E-mail
邵伟 上海工程技术大学城市轨道交通学院, 上海 201620  
朱文发 上海工程技术大学城市轨道交通学院, 上海 201620
华东理工大学机械与动力工程学院, 上海 200237 
zhuwenfa1986@163.com 
范国鹏 上海工程技术大学城市轨道交通学院, 上海 201620  
张海燕 上海大学通信与信息工程学院, 上海 200444  
张辉 上海工程技术大学城市轨道交通学院, 上海 201620  
张梦可 上海工程技术大学城市轨道交通学院, 上海 201620  
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中文摘要:
      传统超声成像方法受瑞利准则的约束,难以对缺陷间距小于成像分辨率阈值的多缺陷进行成像。提出了一种基于时域拓扑能量的超声兰姆波成像方法,将逆散射拓扑成像方法中的拓扑渐进过程转换成求解直接声场和伴随声场。然后通过将伴随声场进行时间反转,两个声场将具有在缺陷处聚焦,在非缺陷处不聚焦的特性。将直接声场和伴随声场进行融合,以时域拓扑能量值作为像素值进行成像,从而使表征缺陷的精度较高。建立了缺陷间距小于分辨率阈值的多盲孔缺陷有限元模型,通过“一发多收”的方式激发S0模式和采集缺陷散射信号,并进行时域拓扑能量成像。仿真结果表明:对于多盲孔缺陷,时域拓扑能量成像法能够获得比延时叠加法和时间反转成像法更高的分辨率,并且能在缺陷间距小于成像分辨率阈值时进行成像。
英文摘要:
      The traditional ultrasonic imaging methods are constrained by Rayleigh criterion, so it is difficult to image multiple defects in the case of defect spacing less than the imaging resolution threshold. In this paper, an ultrasonic Lamb wave imaging method based on time-domain topological energy is proposed, which converted the topological gradual process in the inverse scattering topological imaging method into solving the forward sound field and the adjoint sound field. Then, the two sound fields, in which the adjoint sound field is time reversed, have the characteristics of focusing at the defects rather than focusing in the non-defective area. By fusing the forward sound field and the adjoint sound field and using the time-domain topological energy value as the pixel value for imaging, the defect can be characterized with high precision. In this paper, the finite element models of multi-blind hole defects in the case of defect spacing less than the imaging resolution threshold is established. The S0 mode Lamb wave is excited and the defect scattering signals are collected in the way of "one transmitter and multiple receiver" for time-domain topological energy imaging. The simulation results show that for multi-blind hole defects, the time domain topological energy imaging (TDTE) method can obtain higher resolution than the delay and sum (DAS) method and the time reversal (TR) imaging method, overcome the influence of mode conversion and achieve high-resolution imaging in the case of the defect spacing less than the imaging resolution threshold.
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