基于超声波聚焦原理，提出借助声透镜实现线阵相控阵探头的二维聚焦的方法。通过声场模拟对比了普通线阵相控阵和改进型相控阵的声场分布；通过试验得到了上述两种手段对同一铜钢堆焊结构的C扫描检测图像，并将检测结果与常规单晶片点聚焦探头的检测结果进行了对比。理论分析和试验结果均显示，改进后的相控阵系统能够有效地使线性阵相控阵探头实现二维聚焦，其C扫描结果与常规单晶片探头的检测结果吻合良好；在保证检测准确性和可靠性的前提下，扫描效率也得到了显著的提升。

Based on principle of ultrasonic focusing, the two-dimensional focusing of linear phased array probe is designed by means of acoustic lens. The simulation of sound field is compared with the common linear phased array and improved phased array acoustic field. Afterwards, C-scan images of the Cu-Fe joint are obtained experimentally. Theoretical analysis and experimental results show that the improved phased array system can effectively make the linear phased array probe to realize two dimensional focusing, and the C-scan results with conventional single crystal probe are in good agreement with the results. On the premise of ensuring the detection accuracy and reliability, the scanning efficiency has been significantly improved.