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 (EC) testing is based on electromagnetic induction. The technology can be used to detect flaws in conducting materials or to measure the distance between a sensor and a conducting material. The measurement does not require the tested object to be in direct contact with the test equipment.
How do you measure eddy current?
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.9 Nov 2018
Where eddy current testing is used?
Eddy current testing is most commonly used to inspect surfaces and tubes. It is an incredibly sensitive testing method, and can identify even very small flaws or cracks in a surface or just beneath it. On surfaces, ETC can be done with both ferromagnetic and non-ferromagnetic materials.
Can eddy current detect subsurface defects?
Eddy current testing is a fast, accurate, chemical-free method for detecting a variety of surface and subsurface defects, including cracks, corrosion, and heat damage.