Defect Sizing Simulation Studies for the Tone-Burst Eddy Current Thermography Using Genetic Algorithm Based Inversion

In this paper, the results of the simulation study to reconstruct the size of the defects from the data obtained using the active thermography technique based on transient induction heating will be presented. Simulations were performed using the finite element model to obtain the temperature data which are then used to reconstruct the radius (r _d ) and depth (d _d ) of the wall thinning defects in aluminum plate using inversion method. Two cases, coil inner radius less than the defect radius (r _c <r _d ) and coil inner radius greater than the defect radius (r _c >r _d ), were considered. The analysis of the sensitivity of coil dimensions to the calculated peak temperature at the observation point was carried out.