Electromagnetic Testing Eddy Current in Brief
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An alternat<strong>in</strong>g current flow<strong>in</strong>g through the coil produces a primary magnetic<br />
field that <strong>in</strong>duces eddy currents <strong>in</strong> the part. Energy is needed to generate the<br />
eddy currents, and this energy shows up as resistance losses <strong>in</strong> the coil.<br />
Typical NDE application are designed to measure these resistance losses.<br />
<strong>Eddy</strong> currents flow with<strong>in</strong> closed loops <strong>in</strong> the part.<br />
Figure 2. Diagram illustrat<strong>in</strong>g <strong>Eddy</strong> <strong>Current</strong>s created <strong>in</strong> a port<br />
Charlie Chong/ Fion Zhang
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