介绍了动车车轮在线超声检测系统的结构和原理,针对768个通道的单晶斜探头和双晶直探头所采集的回波信号,提出了一种利用霍尔传感器对行驶中的动车轮对进行定位,从而对大批量超声探头检测数据加以筛选处理的方法。经过实际应用证明,处理后的检测数据在系统中对车轮内部辋裂缺陷的成像准确、清晰。 This paper introduces the structure and principle of on-line ultrasonic testing system for moving wheels. Aiming at the echo signal collected by 768 single-crystal oblique-angle probe and double-crystal straight probe, a moving-wheel pair Positioning, and thus the detection of large quantities of ultrasonic probe data to be filtered treatment method. After the actual application shows that the processed test data in the system of wheel rim crack defects within the imaging accurate and clear.