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时间逆转成像技术具有定位准确和操作简单之特点,本文将其运用于混凝土结构损伤的检测.通过提取各换能器单元的发射信号和损伤散射信号构建超声波传播的传递矩阵然后对其进行奇异值分解,获得包含损伤信息的奇异向量;采用多重信号分类(multiple signal classification,MUSIC)算法,分别基于数值模拟数据和实验实测数据对混凝土结构内部损伤进行成像,实现了准确的损伤定位,并将成像结果与偏移成像法进行对比.此工作探索了将时间逆转成像技术应用于混凝土结构内部损伤实际工程检测可行性,为无损检测技术人员定性或定量分析混凝土结构的内部缺陷提供理论参考.
Time reversal imaging technology has the characteristics of accurate positioning and simple operation.This paper applies it to the detection of damage in concrete structures.The ultrasonic transmission propagation matrix is constructed by extracting the emission signals and the damage scattering signals of each transducer unit and then performing singular value The singular vectors containing the damage information were obtained. The multiple signal classification (MUSIC) algorithm was used to image the internal damage of concrete structures based on the numerical simulation data and the experimental data respectively. The accurate damage localization was achieved and the imaging The results are compared with the migration imaging method.This work explores the feasibility of applying time-reversal imaging technology to the actual engineering of concrete structures internal damage detection, and provides theoretical reference for the non-destructive testing technicians to qualitatively or quantitatively analyze the internal defects of concrete structures.