Eddy Current Testing (ET) inspection is based on the interaction between a magnetic field source, a coil, and the electrically conductive material to inspect. This result of this interaction is the induction of Eddy Currents (also known as electromagnetic induction). Discontinuities can then be detected by measuring and analyzing the intensity variations of the current.
Eddy Current Array (ECA) technology represents the evolution of the Conventional Eddy Current method. This technology offers a wider coverage and a greater sensitivity to potential flaws due to the multi-coil design. Eddy Current Array probes can be customized to best suit the application and required coverage; the number of coils and flexibility of the probe can be adjusted to inspect complex geometries, such as the teeth on gears.
Tangential Eddy Current (TEC) inspection is another technique based on magnetic induction. The main difference between Tangential and Conventional Eddy Current is that the coils are oriented tangential to the surface. Considering that eddy currents are created perpendicular to the surface, this orientation improves the depth positioning and sizing of flaws .
Pulsed Eddy Current (PEC) inspection is a technology based on the magnetic field penetration through multiple layers of coating or insulation to reach the surface of a given material and induce eddy currents. This technique is generally used to measure thickness and to detect corrosion on ferrous materials that are covered with an insulation layer, fireproofing, or coating.
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