Patent ID: 6198278
Filing Date: 2001-03-06
Classification: G01B

Abstract:
A process for determining a thickness of a layer (20) of electrically conductive material, which is deposited on a body (17) if ferromagnetic material, with the aid of at least one measurement coil (14) through which an alternating current flows, and the inductivity change of this measurement coil is evaluated, wherein the following measurement steps occur:determination of an inductivity value L.sub..infin. of the coil (14) in a measurement exclusively in relation to a layer of the electrically conductive material;determination of an inductivity value L.sub.0 of the coil (14) in a measurement exclusively in relation to an uncoated base body of the ferromagnetic material;determination of an inductivity value L.sub.x of the coil (14) in a measurement in relation to the coated layer (20) to be defined;conversion of the inductivity values L.sub..infin., L.sub.0 and L.sub.x into a dimensionless value M.sub.e ; andconversion of the value M.sub.e into a layer thickness value with the aid of a calibration curve.