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5 钢制试样示意图
Fig.5 Schematic diagram of steel specimen (ϕ—diameter of the specimen)
(a) transverse-hole artificial defect sample (b) polar diagram of each transverse hole position