Quantitative Detection of Steel Local Corrosion Using Pulse Eddy Current Thermography

Steel corrosion is one of the most serious problems for industrial safety.Steel surface corrosion can be detected and evaluated by pulsed eddy current(PEC) thermography.Combining numerical simulation and actual corrosion detection experiments,the characteristics were analyzed using PEC thermography to detect corrosions.The width of the high temperature zone and the maximum temperature were extracted to describe the width and depth of the corrosion.The surface temperature profile along the coil was chosen as the input data of the LSSVM (least squares support vector machine).The 2D profile of corrosion was output data.The sample dataset was established with the simulation data and experimental data.The mapping relationship of the thermal image to the defect profile was established.It carried out the 2D profile reconstruction of corrosion defects.