LEI Zhenting, ZHU Xinglong, SUN Jin, MA Haotian, LIANG Li
(School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China)

Abstract: 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 objective condition for subsequent defect analysis. The method is well adapted and economical, with potential applications in the field of non-destructive testing.
Key words: dynamic array element; synthetic aperture focusing imaging; flat ceramic membrane; ultrasound imaging; three-dimensional reconstruction