Eddy current depth penetration ferrous metals
How deep eddy currents penetrate into a material is defined as the depth at which their f = coil frequency; μ = magnetic permeability (in H/mm) of the material.
At two standard depths of penetration (2d), the eddy current density has of test drive frequency, the test material's conductivity and magnetic permeability.
Phase Angle and Impedance
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Description:They normally travel parallel to the coil's winding and flow is limited to the area of the inducing magnetic field. Eddy currents concentrate near the surface adjacent to an excitation coil and their strength decreases with distance from the coil as shown in the image. Eddy current density decreases exponentially with depth. This phenomenon is known as the skin effect. The skin effect arises when the eddy currents flowing in the test object at any depth produce magnetic fields which oppose the primary field, thus reducing the net magnetic flux and causing a decrease in current flow as the depth increases.