A non-destructive testing method of eddy current array is proposed

aiming at the problem that internal defect of carbon steel pipe is difficult to quantitatively detect.After the amplitude normalization and phase difference processing of the eddy current array signals

the simulation and experimental results show that the eddy current array signals have significant changes at the defects.The extreme value of the array signal can obviously reflect the change of the defect depth.The range length of the array signal can directly represent the defect width.The root mean square error of the simulation is 0.70 mm

and the root mean square error of the experiment is 2.88 mm.The eddy current array method is used to realize the quantitative detection of the depth and width of defects on the inner wall of carbon steel pipes.