Patent ID: 11113489

Abstract:
Methods and devices for coding and identifying plate-type workpieces are provided. The methods include: coding a workpiece by producing a code with a local modification in a material structure of a base material of the workpiece within a coding region, reading out the code by performing an eddy-current measurement of a local distribution of an electrical conductivity and/or a permeability of the base material by an eddy-current sensor along a reading-out section in a reading region at least partially including the coding region, a signal calibrated to a distance of the eddy-current sensor from a surface of the reading region being determined for reading out the code, storing the read-out code in a storage device, repeating the reading out of the code by repeatedly performing the eddy-current measurement, and identifying the workpiece by comparing the stored read-out code in the storage device and the repeated read-out code.