互相关和高阶谱时延估计在混凝土板冲击反射法测量中的应用  

APPLICATION OF CROSS CORRELATION AND HIGHER ORDER SPECTRUM TIME DELAY ESTIMATION TO TESTING CONCRETE PLATE BY IMPACT-ECHO METHOD

作　　者：赵国文[1] 向阳[1] 彭勇[1] 王利[1] 卢艳辉[1] 

机构地区：[1]武汉理工大学能源与动力工程学院,武汉430063

出　　处：《无损检测》2003年第10期524-527,共4页Nondestructive Testing

基　　金：国家自然科学基金资助项目 ( 5 0 2 75 10 9) ;湖北省科学基金资助项目 ( 99j0 79) ;交通部通达计划资助项目 ( 95 0 60 2 0 4)

摘　　要：介绍互相关时延估计和高阶谱时延估计的基本理论 ,分别用这两种方法对用双传感器测量混凝土板块波速和开口裂纹深度的数据进行了时间延迟估计 ,从两种方法的时间延迟估计结果比较可见 ,当存在相关高斯噪声时 。The theory on cross correlation and higher order spectrum time delay estimation was introduced. Time delay of the data of both the wave velocity of concrete plate and the depth of surface open crack measured with two transducers were estimated by the two methods, and their results showed that higher order spectrum time delay estimation method was superior to cross correlation method when spatially correlated Gaussian noises existed.

关 键 词：混凝土板 冲击反射法 互相关时延估计 高阶谱时延估计 信号处理 缺陷检测 

分 类 号：TU375.2[建筑科学—结构工程] TG115.28[金属学及工艺—物理冶金]