Non Destructive Testing 3 min read
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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Non Destructive Testing 3 min read
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…
Non Destructive Testing 4 min read
Impedance
Electrical Impedance (Z), is the total opposition that a circuit presents to alternating current. Impedance is measured in ohms and may…
Non Destructive Testing 3 min read
Circuits and Phase
A circuit can be thought of as a closed path in which current flows through the components that make up…
Non Destructive Testing 4 min read
Mutual Inductance
The magnetic flux through a circuit can be related to the current in that circuit and the currents in other…
Non Destructive Testing 5 min read
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…
Non Destructive Testing 3 min read
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,…
Non Destructive Testing 2 min read
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,…
Non Destructive Testing 3 min read
Properties of Electricity
Since eddy current inspection makes use of electromagnetic induction, it is important to know about the scientific principles of electricity…
Non Destructive Testing 3 min read
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…