人工缺陷铝块试样的激光超声三维成像(英文)  

Laser ultrasonic three-dimensional imaging of aluminum block with artificial defects

作　　者：张振振 杨爱玲[2] 赵扬[1] 南钢洋[1] 

机构地区：[1]山东省科学院激光研究所无损检测平台,山东济南250103 [2]中国海洋大学物理系,山东青岛266100

出　　处：《红外与激光工程》2015年第B12期57-62,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(41172110,61107090,51205240);济南市高校自主创新基金(201402008)

摘　　要：给出了结合小波阈值方法的激光超声成像系统,其中激光束作为扫查器扫描铝块试样,而干涉仪作为接收装置。保存的超声信号需要经过小波阈值降噪处理,处理的数据按照扫描的顺序构成三维矩阵,这样可以沿着时间轴切片产生一帧帧图片,这些图片可以利用MATLAB程序叠加成三维空间。最后,这些人工缺陷可以被模型化和可视化。通过结合算法运用超声信号成功地构建了三维物体模型,其中包含了缺陷信息,指明了激光三维成像比传统的激光超声识别缺陷方法更加直观和有效。Laser ultrasonic（LU） three-dimensional（3D） imaging system combining wavelet threshold method（WTM） was presented, in which a laser beam was used to irradiate the aluminum（Al） block as a scanner and an interferometer as a receiver. Ultrasonic signals saved were processed by wavelet threshold for reducing noise. And data processed constitutes a 3D matrix in the scanning sequence, which could be sliced along the time axis to yield spreadsheets and be superposed in a 3D space using the MATLAB procedure. Then, artificial defects can be modelled and visualized. Ultrasonic signals were incorporated with algorithm to successfully reconstruct the 3D object model, which could contain the defect information, indicating that laser ultrasonic 3D imaging is more intuitive and effective than the traditional laser ultrasonic method of identifying defects.

关 键 词：激光超声 三维成像 铝块 缺陷 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]