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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嗓比相位。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。
Aiming at some problems existing in eddy current inspection of pipe, a three-point probe which can match ET-204 eddy current instrument with low excitation voltage was developed and the best signal-to-noise ratio phase was selected by impedance planar display technology. Experimental results show that this method has the characteristics of long-distance detection, high sensitivity and anti-interference.