【摘要】 介绍了Landweber迭代算法衰减成像原理。采用加速的Landweber迭代算法对一带有空洞缺陷体的混凝土灌注桩模型进行了超声波衰减图像重建,所得图像清晰显示出空洞的位置与形状,并与速度重建图像相比较,两者吻合较好。对某桥梁工程灌注桩进行了衰减图像重建与速度图像重建,两者均清楚显示出缺陷体的部位,经钻孔抽芯验证,其结果证明了该衰减成像方法的有效性。更多还原

【Abstract】 Principle of Landweber iterative algorithm attenuation tomography is introduced.Accelerated Landweber iteration algorithm is used to calculate ultrasonic attenuation tomography for a cast-in-place pile model with a hole defect.The result clearly shows the position and shape of the hole,and agrees well with the velocity image.Furthermore,the algorithm is used on the attenuation image reconstruction for a cast-in-place pile of a bridge engineering.The reconstruction image and velocity image both clearly show the place of defect.The results of core-drilling verify the effectiveness of the algorithm.更多还原