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Ahmad, E.
in Cooperation with on an Cooperation-Score of 37%
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Publications (7/7 displayed)
- 2017A real time quantum well hall effect 2D handheld magnetovision system for ferromagnetic and non-ferromagnetic materials non-destructive testing
- 2017A real time quantum well hall effect 2D handheld magnetovision system for ferromagnetic and non-ferromagnetic materials non-destructive testing
- 2017Top-down design of magnonic crystals from bottom-up magnetic nanoparticles through protein arrayscitations
- 2016Non-destructive detection of defects in materials by a hand-held QWHE magnetic scanner
- 2016Non-destructive detection of defects in materials by a hand-held QWHE magnetic scanner
- 2016A quantum well hall effect sensor based handheld magnetic scanner with programmable electromagnetic coil for non-destructive testing of ferromagnetic and non-ferromagnetic materials
- 2005Hybrid Fe3O4 /GaAs (100) structure for spintronics
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booksection
Non-destructive detection of defects in materials by a hand-held QWHE magnetic scanner
Abstract
© Copyright (2016) by British Institute of Non-Destructive Testing All rights reserved. 3D simulations have been performed for frequency dependent detection of defects in metals by exciting a sample with two electromagnets 50 mm apart to investigate, prior to prototyping, the design of a hand-held magnetic scanner constructed from advanced Quantum Well Hall Effect (QWHE) sensors array. The electromagnet is made of two ferrite cores coils each having 22 turns and carrying a current of 2A. The electromagnet is placed 2mm above a rectangular Iron slab which has a groove on its top surface (2mm x 1mm x 0.5 mm). The frequency range for simulations is chosen in such a way that the skin-depth of the Eddy current produced covers the depth of the groove. Simulated magnetic images clearly show the presence of the groove on the surface through leaked flux. The net magnetic field at the boundaries of the groove increases with increase in frequency. This is due to the fact that the contributions from the Eddy current induced magnetic fields which counteract the magnetic flux leakage (MFL) signals, are reduced at higher frequencies. Further investigation using Al shows that by changing frequency, it is possible to probe both the presence of the groove and its depth.