基于动态阵元合成孔径聚焦超声成像的平板陶瓷膜内部缺陷三维重建

Three-dimensional Reconstruction of Defects Inside Flat Ceramic Membranes Based on Dynamic Array Element Synthetic Aperture Focused Ultrasound Imaging

针对平板陶瓷膜内部缺陷可视效果差和超声三维重建运算数据量大等问题,提出了一种基于动态阵元合成孔径聚焦超声成像的平板陶瓷膜内部缺陷三维重建方法。动态阵元合成孔径聚焦超声成像方法是通过在缺陷区域使用多阵元合成孔径,在非缺陷区域使用单阵元合成孔径。采用动态阵元合成孔径聚焦超声成像方法获取多个位置序列的平板陶瓷膜的缺陷B扫描图像,并采用体绘制的方法,实现了平板陶瓷膜缺陷的三维可视化。实验结果表明,采用动态阵元合成孔径聚焦超声成像方法时划痕的重建相对误差在1.27%~2.70%之间,对孔洞的重建相对误差在2.38%~3.03%之间,重建速度平均提高了26.57%。通过对缺陷的三维重建,使得缺陷的呈现更加直观,为后续的缺陷分析的客观性提供了保障。提出的方法具有良好的适应性、经济性,在无损检测领域有重要的意义。

A 3D reconstruction method of defects inside flat ceramic membranes is proposed,basing on dynamic array element synthesis aperture focusing ultrasound imaging,in order to address the problems of poor visualization of defects inside flat ceramic membranes and to reduce the data requirement for ultrasonic 3D reconstruction.In the dynamic array synthetic aperture focused ultrasound imaging method,a multi-array synthetic aperture in defective areas and a single-array synthetic aperture in non-defective areas are used.By using this method to acquire B-scan images of defects in flat ceramic membranes at multiple location sequences and a body drawing method,three-dimensional visualization of defects in flat ceramic membranes is achieved.It is found that relative errors of the reconstruction of scratches using the dynamic array element synthetic aperture focused ultrasound imaging method range from 1.27%to 2.7%,while the relative errors of the reconstruction of holes range from 2.38%to 3.03%,with an average increase in reconstruction speed of 26.57%.The three-dimensional reconstruction method makes the defects more intuitive and provides an objectiv e condition for subsequent defect analysis.The method is well adapted and economical,with potential applications in the field of non-destructive testing.