Eddy Current Testing Service

Eddy current testing
continuous wave eddy current testing is one of several non-destructive testing methods that use the electromagnetism principle. Conventional eddy current testing utilises electromagnetic induction to detect discontinuities in conductive materials.
A specially designed coil energised with alternating current is placed in proximity to the test surface generating changing magnetic-field which interacts with the test-part producing eddy current in the vicinity.
Variations in the changing phases and magnitude of these eddy currents is then monitored through the use of receiver-coil(s), or by measuring changes to the alternate current flowing in the primary excitation-coil.
The electrical conductivity variations or magnetic permeability of the test-part, or the presence of any discontinuities, will cause a change in eddy current and a corresponding change in phases and amplitude of the measured current. the changes are shown on a screen for easy interpretation.
Another method of using the eddy current principle is pulsed eddy current testing. methods are being developed to investigate surfaces through protective coatings, weather sheetings, corrosion products and even the insulation materials.
Inspection of surfaces at high temperature are possible with the eddy current technique as it is a non-contact method.