Patent ID: 6229317
Filing Date: 2001-05-08
Classification: G07D

Abstract:
A system for sensing dielectric properties of currency paper, said system comprising:a) a high frequency generator connected to a generating electrode;b) a receiving conducting electrode situated a spaced distance from the generator electrode in generally the same plane thereof;c) a passive conducting electrode situated in a plane, parallel to the plane of the generating electrode and receiving electrode, and in a fixed position relative to said receiving electrode and said generator electrode, and defining a currency evaluation channel with said passive conducting electrode on one side of said channel, and said generating and receiving electrodes on an opposite side of said channel, passive conducting electrode having no electrical interconnections with electronic scheme of the system; andd) a signal processing arrangement connected with the generating and the receiving electrode and converting the high frequency signal on the receiving electrode with reference to the high frequency generating electrode into a d.c. voltage that characterizes the magnitude of capacitance coupling between the generator and receiving electrodes, the magnitude of the d.c. voltage being dependent on the humidity and dielectric properties of the currency paper placed in the space between the electrodes.