Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-08-29
1985-08-20
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
194100A, 235449, 340675, G01N 2772, G01R 3312, G06K 708
Patent
active
045367094
ABSTRACT:
The metal detecting device includes first and second coils provided on both sides of a passageway for paper money. This metal detecting device is designed for use in detecting a metal strip embedded in the paper money in order to determine whether the paper money is genuine or counterfeit. The first coil is connected to a high frequency AC source to generate an AC magnetic field. The second coil is connected to a capacitor to form a resonance circuit which resonates at the same frequency as the AC current. The variation of the Q factor of the resonance circuit due to eddy-current losses produced in the metal strip of the paper money is used by a detecting circuit to determine whether the paper money passing through the space between the first and second coils is genuine.
REFERENCES:
patent: 2217843 (1940-10-01), Langer
patent: 2513745 (1950-07-01), Reynolds
patent: 2711510 (1955-06-01), Tricebock
patent: 3020472 (1962-02-01), Cauley
patent: 3286168 (1966-11-01), Schmidt
patent: 3422346 (1969-01-01), Hammer
patent: 4063230 (1977-12-01), Purinton et al.
Strecker Gerard R.
Tokyo Shibaura Denki Kabushiki Kaisha
LandOfFree
Detecting device having spaced transmitting and receiving coils does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Detecting device having spaced transmitting and receiving coils , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detecting device having spaced transmitting and receiving coils will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-563114