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Nondestructive metal sheet testing using the phase angle of the electromagnetic fields

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2 Author(s)
G. A. Girgis ; Assiut University, Electrical Engineering Department, Assiut, Egypt ; Awad Bastawros

An exciting cylindrical coil fed with AC current is placed in front of a metallic sheet under test. Variation of the coil impedance due to the presence of the sheet depends on the purity and thickness of the sheet. It is shown that the phase angle rather than the amplitude of the change of the coil impedance is a good measure for testing.

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IEE Proceedings A - Physical Science, Measurement and Instrumentation, Management and Education - Reviews  (Volume:133 ,  Issue: 3 )