摘要
实现基于二维阵列的三维成像会遇到阵元多、通道数多、系统复杂、回波信号弱等困难。从阵元排列的设计着手,分析了时间-空间信号在离散有限长窗函数下的特征,推导出阵列设计的一般准则;依据此准则,根据脉冲回波场理论,在计算机模拟的基础上设计了8×8二维阵列;并利用该阵列实现了相控阵三维体数据的扫描和显示。扫描试验所得人工缺陷的三维图像呈现出良好的轮廓和走向等信息。
More elements, more channels, system complexity and weak signal were the main difficulties in implementing 3D imaging by 2D array. The elements planning was designed, then the behavior of the time-space signal through discrete finite long window was analyzed and the rules to design probe was concluded. A square 2D array with 8 X 8 elements was designed based on computer simulation. 3D imaging was implemented by the array. Experiment showed that, testing system and the 2D array both had good performance. 3D imaging supplied information about contour of the defect.
出处
《无损检测》
北大核心
2007年第4期177-180,184,共5页
Nondestructive Testing
关键词
超声检测
相控阵
二维阵列
维图像
Ultrasonic testing
Phased array
2D array
3D imaging
