2018/10/16 by P. Bevington, Bevington, P., R. Gartman +3 · 1 citation
Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #Electrical and Bioimpedance Tomography #FOS: Physical sciences #Force Microscopy Techniques and Applications #Non-Destructive Testing Techniques
paper · pdf · doi:10.48550/arxiv.1811.01050
openalex publication_date 2018/10/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Non-destructive eddy current testing of defects in metal plates using the magnetic resonance signal of a radio-frequency atomic magnetometer is demonstrated. The shape and amplitude of the spatial profile of signal features that correspond to defects are explored. By comparing numerical and experimental results on a series of benchmark aluminium plates we demonstrate a robust process for determining defect dimensions. In particular, we show that the observed images represent the spatial distribution of the secondary field created by eddy currents in the sample. We also demonstrate that the amplitude and phase contrast of the observed profiles enables us to reliably measure defect depth.