Department of Artificial Environment, Graduate School of Environment and Information Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, 240-8501, Japan.
Department of Mechanical and Materials Engineering, Kanagawa Institute of Industrial Science and Technology, 705-1 Shimo Imaizumi, Ebina, Kanagawa, 243-0435, Japan.
Sci Rep. 2023 Apr 4;13(1):5479. doi: 10.1038/s41598-023-32319-8.
Eddy current (EC) testing has been selected as a standard candidate for detecting defects in conductive materials in the past few decades. Nevertheless, inventing EC probes capable of detecting minor defects has always been challenging for researchers due to the tradeoff between the probe dimensions and the strength of the EC generated on the surface of the test piece. Here, we use a copper core with a sophisticated design to converge the rotating EC at the tip of the copper core to detect small cracks in all directions in conductive materials. In this method, we can arbitrarily accommodate a large excitation coil so that a larger rotating uniform EC is generated in a small area of the test piece. Hence, the probe can detect cracks in all directions in conductive materials.
在过去的几十年中，涡流（EC）检测已被选为检测导电材料缺陷的标准候选方法。然而，由于探头尺寸和试件表面上产生的 EC 强度之间的权衡，发明能够检测小缺陷的 EC 探头一直是研究人员面临的挑战。在这里，我们使用具有复杂设计的铜芯将旋转的 EC 汇聚到铜芯的尖端，以检测导电材料中各个方向的小裂缝。在这种方法中，我们可以任意容纳一个大的激励线圈，从而在试件的小区域中产生更大的旋转均匀 EC。因此，探头可以检测导电材料中各个方向的裂缝。
