Title :
3-D finite-element analysis of eddy-current evaluation of curved plates
Author_Institution :
Lab. d´´Electricite Signaux et Robotique, Ecole Normale Supdrieure de Cachan, France
fDate :
3/1/2002 12:00:00 AM
Abstract :
The eddy current method allows thickness evaluation of conductive plates. However, EC measurements are sensitive to multiple parameters such as the sensor liftoff and the plate curvature. In this paper, the plate curvature effect is studied using a three-dimensional finite-element method, and it is shown that the curvature effect cannot be corrected by a conventional liftoff effect correction. Consequently the curvature effect has to be specifically corrected in the measurement inversion. A correction method using bifrequency measurements is implemented
Keywords :
conducting bodies; eddy current testing; electrical engineering computing; finite element analysis; inverse problems; magnetic flux; neural nets; thickness measurement; 3-D finite-element analysis; bifrequency measurements; curvature effect correction method; curved conductive plates; eddy-current testing; hollow turbine blades; measurement inversion; neural network; plate curvature; sensor impedance; sensor liftoff; thickness evaluation; three-dimensional finite-element method; Blades; Coils; Conducting materials; Finite element methods; Impedance; Iron; Magnetic flux; Magnetic sensors; Thickness measurement; Turbines;
Journal_Title :
Magnetics, IEEE Transactions on
