Reliability Research in Eddy Current Testing for Distinguishing Defects Signal of the Steam Generator Heat Exchanger Tubes

Numerical calculation method is used in simulating and calculating the heat exchanger model in which exists defects in the area of ECT(eddy current testing), the transform relations have been obtained between phase and extent for composite signal under different space and depth of defects. The reliability of quantitative depth for defects is then analyzed and it is concluded that the estimate basis of detection, the efficiency and precision of ECT can be improved.