中文摘要：

带斜楔的相控阵超声检测广泛应用于低碳钢薄壁工件焊缝的检测,研究带斜楔的相控阵超声偏转聚焦检测延时法则和对应的声场将使检测可靠性进一步提高。本文利用费马原理探究了相控阵超声探头辐射声波至楔块中,在楔块-工件平面界面发生模式转换入射到工件中的横波聚焦时各阵元延时的计算方法,数值求解指定焦点时各阵元的延时,并利用计算得到的延时进行声场仿真和实验测量,发现声波能很好的聚焦在目标点,仿真和实验结果吻合。

英文摘要：

Phased array ultrasonic testing with inclined wedges is widely used in low carbon steel thin-wall workpieces welds inspection. Investigation of delay laws for phased array ultrasonic focusing deflection testing can improve the evaluation reliability even more. In the ultrasonic testing, sound wave radiated from a phased array probe passes through the wedge-specimen plane interface and the mode conversion shear wave was focused in the specimen. Employing Fermat principle, calculations of each element delay time was deduced and a numerical solution for a focal point was got. Finally, simulation and experimental measurement of focusing acoustic field was carried out. The result shows that the beam can focus on the target point, and the simulation and experimental results agree well.