提高Zr－4管涡流检测信噪比及可靠性方法研究

The Method Research on Improving Singnal-to-Noise Ratio and Reliability in Eddy Testing for Zr-4 Tubes

针对管材涡流探伤中存在的一些问题，研制出可匹配低激励电压ＥＴ－２０４型涡流仪的三点式探头，并采用阻抗平面显示技术选择最佳信噪比相位。实验结果表明，该方法具有远距离检测、高灵敏度、抗干扰的特点。

To the problems in the tube eddy testing, some improved ways are given by using a three-point probe matching the eddy instrument model ET-204 with low field voltage, and selecting a phase having the optimum singnal-to-noise ratio with impedance plane technique.The testing results show that the method possesses a jamproof capability for distant testing with high sensitivity.