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01.06.2019 - Novel publication about Lorentz force evaluation

The Lorentz force evaluation aims to detect and characterize defects in electrically conducting materials. A velocity dependent Lorentz force evaluation is introduced in order to improve the defect depth estimation. Data sets of a specimen with stacked aluminum sheets and a cylindrical permanent magnet with defects of different shapes and depths are evaluated at two different velocities. The data sets have been simulated by the finite element method. Shifts and amplitude changes of the Lorentz force perturbation signals at a high velocity (v=10 m/s) in comparison to a low velocity (v=0.1 m/s) can be used for the estimation of the defect depth.

E. Dölker, R. Schmidt, H. Brauer and J. Haueisen, "Velocity-Dependent Lorentz Force Evaluation: A Simulation Study," in IEEE Transactions on Magnetics, vol. 55, no. 6, pp. 1-4, June 2019, Art no. 6201104.
doi: 10.1109/TMAG.2019.2901579

URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8671463&isnumber=8716604

Lorentz force pertubation signal components (a) ΔFx and (b) ΔFz: The amplitude ratio show the increase of amplitudes (red fluctuation range) with increasing velocity [v=0.1 m/s (left) versus v=10 m/s (right)]. The amplitude ratio is smaller for deeper defects at 10 mm (bottom) compared to the defect depth of 2 mm (top). Additionally, the main peaks (red arrows) of the force perturbation signals are shifted with increasing velocity.