超声相控阵矩阵阵列三维合成聚焦成像方法

Research on three dimensional synthetic focusing imaging based on matrix phased array probe

掌握缺陷的三维形态信息,会更利于无损评估,因此将合成聚焦二维成像方法扩展,初步探索了三维合成聚焦成像方法,以直观得到缺陷的超声三维成像.将该方法在MATLAB平台编程实现,然后通过超声相控阵矩阵探头采集到的完备集数据后处理进行了验证.结果表明,通过三维合成聚焦处理后,得到探头下方空间的超声成像的三维图像数据,然后在此基础上使用等值面法将缺陷的三维图像分割出来.该图像能够清晰反映出反射体的真实位置及空间分布;在超声探头没有机械移动扫描的前提下能够得到缺陷三维图像.对于探头移动空间受限的检测位置获取缺陷三维图像有一定的理论意义及实用价值.

Knowing three-dimensional information of the defects will be conducive to nondestructive evaluation. In this study,the two-dimensional synthetic imaging method was expanded,and a preliminary exploration on a new method of three dimensional synthetic focused imaging was carried out in order to obtain three dimensional ultrasonic Imaging with defects directly.This new method was implemented by programming on the Matlab platform. The verification was carried out by processing the complete set of data collected by the ultrasonic phased array matrix probe. After the three dimensional synthetic focusing treatment,the three-dimensional data of the ultrasonic imaging in the space under the probe was obtained,then the three-dimensional image of the side-drilled holes was segmented using iso-surface method.The results showed that the defect's three-dimensional image can be obtained without the mechanical moving scanning of the ultrasonic probe,and the image can clearly reflect the true position and spatial distribution of the reflector. This method had a certain theoretical significance and practical value to obtain the three-dimensional image of the defects in the detection position where the moving of the ultrasonic probe was confined.