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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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…
Non Destructive Testing 1 min read
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…
Non Destructive Testing 3 min read
Eddy Current Testing (ET) Overview
Eddy current testing a modern Non-destructive testing – NDT method that has become one of the prime tool for quality…