造成压水堆核电站蒸汽发生器降质的主要原因有晶间腐蚀、应力腐蚀裂纹、减薄、凹痕、机械磨损、疲劳等。为了可靠地检测出传热管的运行缺陷，分析了旋转探头与阵列探头的特性，对两种探头的缺陷识别以及检测能力进行了比较试验，确定了传热管涡流检测中使用旋转探头及阵列探头的技术特点。

The exchange tube of steam generator is the weak point of reactor's primary circuit. Usually the degradation of PWR nuclear power plant steam generator is mainly caused by corrosion and mechanical wear which include intergranular corrosion, stress corrosion cracking, reduction, dent, mechanical wear, fatigue and etc. In order to detect the defects of heat transfer tubes with higher efficiency and reliability, this article aims to analyze their characteristics. A series of experiments were carried out for the comparison of the defect recognition and detection ability of these two types of probes. The ability of eddy current testing with these two kinds of probes was determined as well.