激光-EMAT法非接触式无损检测金属内部缺陷研究

Noncontact nondestructive detection of inner metal defects based on laser-EMAT technique

为了实现金属材料内部缺陷的非接触式无损检测,采用激光-电磁超声方法进行了理论分析和实验验证研究,取得了钢坯试样中深度为40mm、尺寸为3mm×30mm孔洞人工伤的检测数据,检测结果与实际孔洞位置之间的测量误差约为5%。结果表明,激光-电磁超声技术适用于金属材料内部缺陷的非接触式无损检测。

Theoretical analysis and experiments about laser-EMAT （electromagnetic-acoustic transducer） technique were carried out for the purpose of noncontact and nondestructive detection of inner defects of metal parts. The test slab contains a O3mm - 30mm artificial hole about 40mm beneath the surface. The testing error was about 5%. The result shows that the laser-EMAT technique is suitable for noncontact and nondestructive detection of inner metal defects.