Eddy Current Technology

Category: Characterization > Sampling & Analysis Equipments > Analysis Equipment
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Eddy current testing (ECT) is based on inducing electron flow (eddy currents) in electrically conductive material. Any defect in the material such as cracks, pitting, wall loss, or other discontinuities, disrupts the flow of the eddy currents. ECT array probes use a number of individual coils grouped together in one assembly. Array probes are configured with flat or circular coils, or have coils shaped to match the inspection surface. The coils work together to scan a wider inspection area than conventional coil probes. Data from ECT array probes is transmitted directly from the probe to computer memory for record keeping and graphic, color-coded reports. Higher frequency signals are used to detect near-surface flaws. Lower frequencies are used for deeper, subsurface flaw detection.

Benefits

ECT array inspection has many benefits: •Faster inspections •Simpler, faster inspection of complex shapes •Simpler scan patterns and lower cost scanners •Various types, shapes, and sizes of coils are available •Computer-based data records and reports •ECT array testing can replace liquid dye penetrant or magnetic particle testing and eliminate the time and effort of surface preparation.

Limitations

•Only conductive materials can be inspected •Surface must be accessible to the probe •Skill and training required is more extensive than other techniques •Surface finish and and roughness may interfere •Reference standards needed for setup •Depth of penetration is limited •Flaws such as delaminations that lie parallel to the probe coil winding and probe scan direction are undetectable

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