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Eddy Current Instruments
Eddy current instruments can be purchased in a large variety of configurations. Both analog and digital instruments are available. Instruments are commonly…
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Phase Lag
Phase lag is a parameter of the eddy current signal that makes it possible to obtain information about the depth…
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Depth of Penetration & Current Density
Eddy currents are closed loops of induced current circulating in planes perpendicular to the magnetic flux. They normally travel parallel…
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Impedance
Electrical Impedance (Z), is the total opposition that a circuit presents to alternating current. Impedance is measured in ohms and may…
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Circuits and Phase
A circuit can be thought of as a closed path in which current flows through the components that make up…
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Mutual Inductance
The magnetic flux through a circuit can be related to the current in that circuit and the currents in other…
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Self-Inductance and Inductive Reactance
The property of self-inductance is a particular form of electromagnetic induction. Self inductance is defined as the induction of a voltage in…
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Induction and Inductance
Induction In 1824, Oersted discovered that current passing though a coil created a magnetic field capable of shifting a compass needle. Seven years later,…
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Current Flow and Ohm’s Law
Ohm’s law is the most important, basic law of electricity. It defines the relationship between the three fundamental electrical quantities: current, voltage,…
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Properties of Electricity
Since eddy current inspection makes use of electromagnetic induction, it is important to know about the scientific principles of electricity…
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Basic Principles of Eddy Current Inspection
Eddy current inspection is one of several NDT methods that use the principal of “electromagnetism” as the basis for conducting…
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History of Eddy Current Testing
Eddy current testing has its origins with Michael Faraday’s discovery of electromagnetic induction in 1831. Faraday was a chemist in…