Simulation and Experimental Study of a Rotating Electromagnetic Field Probe for Nondestructive Testing

Maintaining the integrity of pipelines that are used to transport natural gas and petroleum products is of utmost importance. In this study, a novel probe that uses the rotating electromagnetic field measurement method to detect cracks in the inner walls of pipelines is proposed. This paper investigates the probe based on the rotating electromagnetic field, identifies periodic changes in the rotating electromagnetic field, deduces the magnetic induction intensity of the arc-shaped excitation coil, and establishes static detection simulation models. The distribution of the magnetic field near the crack under arc excitation is analyzed, and experimental conditions consistent with the simulation model are established. Furthermore, experiments are conducted to assess the probe’s detection capabilities, and its quantitative detection performance is evaluated. In addition, the principles and functions of the rotating electromagnetic field tool are elucidated. The results demonstrate that the proposed probe exhibits exceptional capabilities for crack inspection in pipe walls, potentially serving as a technical reference for early warning systems and ensuring the long-term safe operation of metal structures.