METHOD FOR OPERATING AN EDDY CURRENT SENSOR AND EDDY CURRENT SENSOR

摘要

The invention relates to a method for operating an eddy current sensor (1) comprising a measuring coil (2) and an evaluation circuit (4) for determining material and geometrical parameters of a test object (5) which is arranged at a distance (d) from the measuring coil (2). The impedance of the measuring coil (2) is evaluated while the measuring coil (2) is being supplied by an alternating voltage of a predetermined frequency. The evaluation circuit (4) determines the material and geometrical parameters of the test object (5) on the basis of the impedance of the measuring coil (2). The impedance of the measuring coil (2) is determined with an alternating voltage with a first and then a second frequency. The evaluation circuit (4) calculates the material and geometrical parameters of the test object (5) on the basis of the impedance of the measuring coil (2) with the first and second frequencies. An eddy current sensor which can be advantageously used in conjunction with the inventive method is also disclosed.