Abstract
Eddy-current testing is an important nondestructive testing method in defect detection and evaluation of conductive materials. In testing of moving multilayer conductive plates, a rectangular exciting coil is placed perpendicular to the conductor, and cylindrical or rectangular coils are positioned below the exciting coil serving as pick-up coils. Accurate theoretical expressions of the induced voltage variations in the pick-up coils are derived, and the influences of the two pick-up coils’ exciting frequency and moving speed to the induced voltages are evaluated and compared. The rectangular and cylindrical pick-up coils are also used in testing for flaws in the conductors. The analytical calculation results are verified with experimental results.
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