Patent ID: 7109724
Filing Date: 2006-09-19
Classification: G01R

Abstract:
1. A device for measurement of mobility and sheet charge density in conductive sheet materials, comprising: a microwave source; a circular waveguide positioned to receive microwave power from said microwave source; a mount adapted to position a sheet material item at a measurement location to receive microwave power transmitted from said circular waveguide, said mount having a planar surface and a disc positioned in said mount, said disc being rotatable with respect to said mount about an axis substantially perpendicular to the plane of said mount planar surface, said disc having a bore therein that is not coaxial with said axis so that rotation of the disc adjusts the position of the bore relative to the mount; wherein said bore defines a portion of said sheet material exposed to an output of said circular waveguide; a magnet positioned to induce a magnetic field at the measurement location; a first detector to detect the power of the microwave source; a second detector to detect the power of the microwave power reflected from the sheet material item in the measurement location; and a third detector to detect a Hall effect microwave power reflected from the sheet material item.