Eddy current testing ET
Eddy current testing is relatively least used inspection method, which allows to detect surface and subsurface defects. The main advantage of the method is that ET is a very sensitive and quick to perform. During ET testing, the inspected material is excited with alternating electrical current. Resulting reaction data from the material is subsequently received by the testing probe and an ultrasonic diagnostic device. Analysis of various parameters of the electromagnetic field provides accurate information on the condition of the material, defects in place, erosion and corrosion changes, assessment of their size and an estimate of the depth, at which they are located. Eddy current testing is limited to metal materials and the test depth can vary from a few to up to twenty millimeters.