基于二维阵列的相控阵超声三维成像实现

3-D imaging by a 2-D ultrasonic phased array

基于二维阵列的三维成像在实现上具有阵元多、通道数多、系统复杂、回波信号弱等困难。从阵列探头的设计着手,分析了时间空间信号在离散有限长窗函数下的行为特点,推导出阵列探头设计的一般规则;在此基础上,利用脉冲回波场理论,通过计算机模拟,设计了8×8二维阵列探头,并利用该阵列实现了相控阵超声三维体数据的扫查和显示。实验表明,该系统和阵列探头具有良好的性能,扫查所得人工缺陷的三维超声图像提供了很好的轮廓、走向等信息。

The main difficulties in implementing 3 D imaging by a 2 D array are the need for more dements and more channels, the system complexity and weak signals. In this article, the behavior of the time-space signal in a discrete long window is analyzed to identify rules to design the probe. A square 2 D array with 8 × 8 elements was designed using computer simulation for 3 D imaging. Tests show that the testing system and the 2 D array both perform well. The 3 D imaging supplies accurate information about the contour of a defect, which confirms its effectiveness for fast and accurate non-destructive testing and evaluation.