Circumferential and Longitudinal Defect Detection Using Multiphysics Fusion Electromagnetic Sensing Probe

Abstract

Traditional magnetic flux leakage (MFL) detection technology is limited to single direction defect detection, which will lead to missed detection and bring great hidden danger to pipeline safety assessment. This paper proposes a new structured multiphysics sensing of merging Alternating Current Field Measurement (ACFM) and MFL within a multi-parameter system for different defects detection. In particular, a novel electromagnetic coupling sensor structure is proposed, which enables simultaneous interaction between the excitation modes of Yoke and coil. Magnetic Yoke is integrated to magnetizing the axial pipeline to detect the circumferential defects while the coil excites the circumferential uniform alternating current field and recognizes the axial defect. The novel structured sensing is highly sensitive to the detection of both Circumferential and Longitudinal defects. Simulation and experiments on defects in several samples have been conducted to validate the reliability and efficiency of the proposed system.