Eddy current methods for evaluation of the transformed fraction of metals by voltage source

Finite-element methods employing voltage sources rather than widely used current sources are used to evaluate magnetic permeability, impedance, and transformed fraction in metals. The transformed fractions have been successfully estimated by nondestructive eddy-current measurements using voltage sources. The experimental results agree well with those of numerical simulations. The authors also investigate the sensitivity of the eddy-current measuring system as a function of the various parameters by numerical simulations, and present a suitable measuring environment for nondestructive testing of the properties of materials. It is determined that a rectangular sensor may be better than a cylindrical sensor in eddy-current measurements of conductive material