基于冲击回波深度谱的混凝土结构层析成像  

Tomography of Concrete Structure Based on the Depth Spectrum of Impact Echo Test

作　　者：胡俊华 李松辉[1] 张龑[1] 黄锦林[2] 叶合欣[3] 罗日洪[2] HU Junhua;LI Songhui;ZHANG Yan;HUANG Jinlin;YE Hexin;LUO Rihong(China Institute of Water Resources and Hydropower Research, Beijing, 100038, China;Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510635,China;Guangdong Technology Center of Water Resources and Hydropower, Guangzhou 510635, China)

机构地区：[1]中国水利水电科学研究院,北京100038 [2]广东省水利水电科学研究院,广州510635 [3]广东省水利水电技术中心,广州510635

出　　处：《广东水利水电》2022年第3期1-6,共6页Guangdong Water Resources and Hydropower

基　　金：国家自然科学基金面上项目(编号:52079061);广东省水利水电技术中心科技项目(编号:440001-2021-18629)。

摘　　要：针对混凝土缺陷检测,提出了一种基于冲击回波数据深度谱的层析成像方法。首先,在混凝土表面绘制网格,在网格上进行冲击回波测试,对记录的信号进行处理,以获得混凝土的频谱;然后,将频率谱转换为深度谱,将各点数据合并成三维数据体;最后,对数据体进行深度谱层析成像,构建任意截面的混凝土结构图像。通过数值模拟验证了该成像方法的有效性和可靠性,结果表明,深度谱层析成像可以成功地显示混凝土试件的内部裂缝。For concrete defect detection,a tomography method based on depth spectrum of impact echo data is proposed.First,the impact echo test is conducted at the grid drawn along the surface of the concrete and the recorded signal is transformed by fast Fourier transform to obtain the frequency spectrum.The frequency spectrum is converted into depth spectrum,and the point data are combined into three-dimensional data volume.Finally,the depth spectrum tomography of the data volume is utilized to construct the concrete structure image of any section.The effectiveness and reliability of the method are verified by the numerical simulation.The results show that depth spectrum tomography can successfully reveal the internal cracks of concrete specimens.

关 键 词：冲击回波测试 频率-深度谱转换 谱层析成像 混凝土缺陷检测 

分 类 号：TV331[水利工程—水工结构工程]