现阶段核电站换热管的内壁缺陷(内伤)的深度定量是通过检测信号的相位-缺陷深度的线性拟合曲线映射得到的。但根据现场数据分析的实际经验, 该种定量方法仍然存在偏差。结合实际内壁缺陷的涡流检测和金相解剖数据, 采用基于最小二乘的非线性拟合的方法制作新的相位和幅值标定曲线, 并采用统计方法比较现有拟合曲线与原始标定曲线下的定量数据准确性, 发现新拟合曲线下的定量结果更准确。

The quantification of depth for inner defects of heat exchange tubes in nuclear power plant was realized by acquisition data mapped under the linear fitting of phase against defect depth curve. But according to practical experience of data analysis, there still exists deviation in this method. In this paper, based on eddy current and metallographic anatomy data, new phase and amplitude calibration curves were fitted by nonlinear least squares method, and then the comparison of data accuracy as analyzed by statistic method between fitting curves and the original one was undertaken and it was shown that the new phase fitting curves were more accurate for data quantification.