SignalProcess&System信号与系统传感器世界2023.05Vol.29NO.05Total33525摘要：时间反演理论自上世纪90年代提出就引起了研究人员的兴趣，于2004年由声学拓展到电磁学，并被应用于无损检测、通信和医疗成像等多个领域。文中微波的时间反演多信号分类法被首次用于介质材料的无损检测，通过测量电磁波分别在有损样本和标准无损样本传播的信道响应，并取其差值获得用信道响应矩阵表示的样本缺陷对电磁波的散射作用，进而利用特征值分解对信道响应进行降维，并根据已知信道格林函数进行成像。根据在时域有限积分软件的仿真结果可知，该方法能够分辨样品中尺寸远小于波长的单个微小缺陷，且误差较小，是一种超分辨率的方法。关键词：无损检测；微波时间反演；时间反演多信号分类算法中图分类号：TN98；O441.5文献标志码：A文章编号：1006-883X(2023)05-0025-06收稿日期：2023-02-06DOI:10.16204/j.sw.issn.1006-883X.2023.05.005ExplorationofMicrowaveNon-DestructiveEvaluationImagingBasedonTimeReversalCHENTiantian,YANGXiaoqing*,TIANShan,LIXudong(CollegeofElectronicsAndInformationEngineeringofSichuanUniversity,Chengdu610065,China)Abstract:Theoryoftimereversalwasproposedin1990s,ithasarousedinterestofresearchersandwasextendedfromacousticstoelectromagnetismin2004,beingappliedinmanyfieldssuchasnondestructivetesting,communicationandmedicalimaging.Inthepaper,themicrowavetimereversalmulti-signalclassificationmethodisusedforthefirsttimeinthenondestructivetestingofdielectricmaterials.Aftermeasuringthechannelresponseofelectromagneticwavepropagationinthelossysampleandthestandardlosslesssamplerespectively,thedifferenceiscalculated,thustheelectromagneticscatteringeffectofdefectisobtainedrepresentedbythechannelresponsematrix.Byeigenvaluedecompositionofchannelresponse,imagingisachievedwiththeknownGreen’sFunction.Accordingtothesimulationinsoftwareoftimedomainfiniteintegration,thesuper-resolutionmethodisabletodistinguishasingletinydefectwhosesizeismuchsmallerthanthewavelengthwithasmallerror.Keywords:non-destructiveevaluation;microwavetimereversal;timereversalmulti-signalclassification基于时间反演的无损检测成像初探基于时间反演的无损检测成像初探陈恬田杨晓庆*...
