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Eddy current testing is a non-destructive testing (NDT) inspection method used for a variety of purposes, including for flaw detection, material and coating thickness measurements, material identification and establishing the heat treatment condition of certain materials.

Eddy current testing is based on the physics phenomenon of electromagnetic induction. In an eddy current probe, an alternating current flows through a wire coil and generates an oscillating magnetic field. ... This in turn affects the movement of electrons in the coil by varying the electrical impedance of the coil.

An eddy current is also called the Foucault current. Eddy currents are swirls of electric currents induced within conductors by a changing magnetic field within the conductor (self-inductance). Eddy current works on the principle of Faraday's law of induction. The Eddy Current Principle works as the Self-inductance.

Direct measuring of eddy currents is simply impractical. Yes, you can attach electrodes to the media, where you excite currents, and measure the current directly. This will be called a transformer. Measuring eddy currents is a special area of NDT.

Eddy current allows analysts to inspect materials on a surface and near-surface level. ... The best eddy current instruments can detect cracks for complex inspections like tubing via multiple frequencies and dual options, and can pick up developing cracks as small as 0.1 mm or less in dept