Abstract
Nondestructive evaluation has currently achieved new capabilities with the introduction of Magneto-Optic Imaging (MOI). The technique offers real-time images of surface as well as subsurface features such as cracks or corrosion. MOI is investigated here for the inspection of pipelines. Magnetic flux leakage maps associated with applied AC current are monitored to locate material features and defects. Computational modeling is presented to characterize the sensitivity of MOI signals to material flaws, based on a three-dimensional finite element method using A-V formulation. Validation of the modeling is performed using the experimental results of the standard TEAM problem 27. Presented results show that the inspection sensitivity is dependent on the injected current frequency and defect features. MOI techniques provide a promising system in detecting hidden flaw features in pipelines.