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Magnetic tomography is a new and nondestructive testing technology based on the metal magnetic memory method, which can perform noncontact testing outside a pipeline. To identify the type of defect from the characteristics of the magnetic field signal detected by this method, we performed basic research on the propagation mechanism of a magnetic memory signal outside the pipe. In this paper, a magnetic field model of the stress concentration zone was first discussed based on the magnetic dipole theory. A 3-D formulation of the spatial propagation of the magnetic memory signals detected by the magnetic tomographic method was built, based on the Biot&#x2013;Savart law and the magnetic vector potential. The reliability of the model was verified by comparing the field testing signal with the model-calculated values. The model can well describe the propagation law of the magnetic memory signal for the stress concentration zone generated on the inner wall of a pipeline.

Spatial Propagation Law of Magnetic Memory Signals Detected by Using Magnetic Tomography Method