金属圆棒超声螺旋扫查检测的合成孔径成像技术

李振杰, 蔡桂喜, 张博, 李经明, 李建奎

Synthetic Aperture Imaging Technology for Ultrasonic Spiral Scanning Detection of Metal Bars

LI Zhenjie, CAI Guixi, ZHANG Bo, LI Jingming, LI Jiankui

图1 Cartesian坐标系下超声合成孔径成像技术(SAFT)原理图

Fig.1 Schematic diagram of SAFT imaging in cartesian coordinate system (SAFT—synthetic aperture focusing technology; x and z—location for object point by lateral distance and depth, L—effective length of synthetic aperture, β0.5—diffusion angle of sound beam, 1…i…n—position of each probe, S1…Si…Sn—detection signal at each probe position, M and M ′—measured size of defect A before and after SAFT processing, respectively) (a) linear scanning mode (b) signal set corresponding to each detection position (c) SAFT reconstructed image