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Probes – Shielding & Loading
One of the challenges of performing an eddy current inspection is getting sufficient eddy current…
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Probes – Configurations
Eddy current probes are classified by the configuration and mode of operation of the test…
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Absolute Probes
Absolute probes generally have a single test coil that is used to generate the eddy…
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Display – Analog Meter
Analog instruments are the simplest of the instruments available for eddy current inspections. They are…
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Display – Complex Impedance Plane
Electrical Impedance (Z), is the total opposition that a circuit presents to an alternating current. Impedance, measured…
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Bridges
The bridge circuit shown above is known as the Maxwell-Wien bridge (often called the Maxwell…
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Resonant Circuits
Eddy current probes typically have a frequency or a range of frequencies that they are…
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Eddy Current Instruments
Eddy current instruments can be purchased in a large variety of configurations. Both analog and digital instruments…
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Phase Lag
Phase lag is a parameter of the eddy current signal that makes it possible to…
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Depth of Penetration & Current Density
Eddy currents are closed loops of induced current circulating in planes perpendicular to the magnetic…