通过对涡流检测传感器的设计和制作，对触头罩缺陷和涡流信号响应特征之间的关系进行了分析和研究，对比分析了裂纹等缺陷的阻抗图特征。验证了根据阻抗图幅度和相位分析判定缺陷的技术优点。实践表明，涡流检测速度快、灵敏度高且测试结果准确。

The design and development of eddy current transducer were introduced, the relationship between the flaws and characteristics of eddy current signals was analyzed and studied in contact cover, the features of the impedance diagram for the flaws such as cracks were analyzed by comparison. The advantages of the technique by which the flaws were discriminated on the basis of impedance diagram and phase analysis were testified. Through practical testing, it showed that the eddy current testing could increase the testing speed, improved the sensitivity and test accurately.