Current penetration versus frequency
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The depth at which eddy current density has decreased to 1/e, or about 37% of the The depth of penetration decreases with increasing frequency, conductivity .
Eddy currents are closed loops of induced current circulating in planes perpendicular to the The depth of penetration decreases with increasing frequency and.
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Description:Check out our lines of surface and tubing probes to find the one that suits your needs. Permeability Permeability is, also, not uniform. The more intimate your knowledge of the material under test, the better you can choose an operating frequency, and the better your inspection results will turn out to be. So even if the proper penetration can be achieved in ferrous materials, most of the time the level of noise is higher than in non-ferromagnetic materials. They also have to be taken into consideration when choosing an operating frequency for inspection. Nowadays, most available test instruments deliver frequencies as low as 5 Hz up to several tens of megahertz. This is why other electromagnetic technique have been developed.
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