6. Eddy currents
6.1 Principle and physical basis
6.1.1 Principle of eddy current detection
When a conducting body is placed in a magnetic field that varies in time or space, induced currents develop in a closed circuit inside it. These are known as Foucault currents (French physicist 1819-1868).
A coil carrying a variable current, such as an alternating current, generates such induced currents which, in turn, create a magnetic flux that opposes the generating flux, thereby modifying the impedance of the coil....
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Eddy currents
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