Eddy Current Testing
Eddy current testing is a non-destructive method used to detect surface and near-surface defects in electrically conductive materials. Based on electromagnetic induction, it enables fast, contactless, and highly precise inspection – ideal for automated inline testing as well as maintenance and laboratory applications.
The eddy current method operates on the principle of electromagnetic induction. A probe coil generates an alternating magnetic field that induces circulating eddy currents in the conductive test material. When the current flow encounters discontinuities such as cracks, pores, or inclusions, the resulting change in magnetic coupling alters the coil’s impedance. This deviation is measured, visualized, and evaluated as a defect signal.
Depending on the test frequency and probe design, eddy current testing can detect both fine surface defects and near-surface irregularities with resolutions of up to 30 μm under optimal conditions. Since the method is contactless and requires no coupling medium, it leaves the test surface completely undamaged and contamination-free.
Modern eddy current systems from FOERSTER combine precise sensor technology with intelligent digital signal processing and automation capability. Multi-frequency testing, adaptive filtering, and software-supported evaluation make it possible to detect the smallest defects even in complex geometries or harsh industrial environments. With minimal maintenance, low energy consumption, and complete traceability according to international standards, eddy current testing is one of the most efficient and environmentally friendly non-destructive testing methods worldwide.