Study of Ultrasonic CT Method in Nondestructive Detection of Large Scale Concrete Structural Member of Bridge
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摘要: 超声波CT成像技术是利用专用设备记录超声波从接收探头到超声震源之间的传播时间, 并据此反演、计算弹性波速度分布的一种方法。通过分析目标区内声波速度的分布特征, 间接获得目标体强度以及均匀性等信息。介绍了超声波CT的工作原理, 对比分析不同观测系统进行的正演模拟计算, 并对不同反演迭代算法进行了优化设计。该方法已在大型混凝土构件无损检测中进行了实际应用, 与其它测试手段相比, 该技术效率高、结果直观、对缺陷定位准确, 是大型混凝土构件中缺陷普查的首选方法。Abstract: The ultrasonic computed tomography (USCT) method could record the arriving times of ultrasonic wave between the probes and the sources to calculate the elastic wave velocity in the section using the arrival times. Through analyzing the distribution of seismic velocity in aimed area, the information of the strength and the homogeneity of the investigated zone could be got indirectly. The operational principle of USCT was introduced. According to the calculation result of forward model in partially recording geometry and completely recording geometry and the difference of the inversion algorithm, the better algorithm was chosen and was used to detect the interior defects in large scale concrete structural member. Compared with other exploration methods, this method was more efficient and accurate.
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