Patent ID: 6815947
Filing Date: 2004-11-09
Classification: G01B

Abstract:
A method for measuring in an electrically conductive film of a specific sample, the method comprising:providing data indicative of a free space response of an RF sensing coil unit to AC voltage applied to the RF sensing coil; locating said sensing coil proximate to the sample at a distance h substantially not exceeding 0.2 r wherein r is the coil radius; supplying an AC voltage in a range from 100 MHz to a few GHz to the sensing coil to cause generation of an eddy current passage through the conductive film; detecting a response of said sensing coil to an effect of the electric current through the conductive field onto a magnetic field of the coil and generating measured data indicative of said response; and utilizing said data indicative of the free space measurements to analyze the measured data and to determine at least a thickness of the conductive film in said specific sample, the method providing for measuring in conductive films with a sheet resistance Rs in a range from about 0.009 to about 2 Ohm/m2.