Magnetic detection system for use in currency processing and method and apparatus for using the same
First Claim
1. A magnetic detection system for authenticating a document, the magnetic detection system comprising:
- a first magnetic scanhead being adapted to create a first magnetic field for saturating the magnetization of an area on the document;
a second magnetic scanhead including an electromagnet, the electromagnet being configured to create a second magnetic field of adjustable intensity, the second magnetic field being of opposite polarity from the first magnetic field;
wherein the intensity of the second magnetic field is adjusted by changing the amount of current supplied to the electromagnet, wherein the amount of current supplied to the electromagnet is adjusted based upon a characteristic of the document to be authenticated.
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Accused Products
Abstract
A magnetic detection system for authenticating a document includes a first magnetic scanhead adapted to create a first magnetic field for saturating the magnetization of an area on each of the bills. The magnetic detection system further includes a second magnetic scanhead with an electromagnet. The electromagnet is capable of creating a second magnetic field of adjustable intensity. The second magnetic field is the opposite polarity of the first magnetic field. The intensity of the second magnetic field is adjusted by changing the amount of current supplied to the electromagnet. The amount of current supplied to the electromagnet is based upon a characteristic of the document to be authenticated.
278 Citations
39 Claims
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1. A magnetic detection system for authenticating a document, the magnetic detection system comprising:
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a first magnetic scanhead being adapted to create a first magnetic field for saturating the magnetization of an area on the document; a second magnetic scanhead including an electromagnet, the electromagnet being configured to create a second magnetic field of adjustable intensity, the second magnetic field being of opposite polarity from the first magnetic field; wherein the intensity of the second magnetic field is adjusted by changing the amount of current supplied to the electromagnet, wherein the amount of current supplied to the electromagnet is adjusted based upon a characteristic of the document to be authenticated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A magnetic scanhead for sensing a flux measurement of a document being transported past the scanhead, comprising:
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a first pole piece generally perpendicular to a transport direction of the document; a second pole piece generally perpendicular to the transport direction and generally parallel to the first pole piece; a middle section located between the first pole piece and the second pole piece; a coil having a conductive core and an insulating material, the coil being twisted around at least a portion of the first pole piece, the coil having a plurality of ends; at least one power supply wherein the plurality of ends of the coil are electrically connected to the power supply, the power supply being adapted to supply an adjustable and reversible D.C. electric current to the coil; a sensor between the first pole piece and the second pole piece, the sensor being adapted to sense the flux measurement of the document being transported. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A magnetic scanhead for sensing a flux measurement of a document being transported past the scanhead, comprising:
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a first pole piece perpendicular to a transport direction of the document; a second pole piece perpendicular to the transport direction and parallel to the first pole piece; a middle section located between the first pole piece and the second pole piece; a coil having a conductive core and an insulating material, the coil being twisted around at least a portion of the first pole piece, the coil having a plurality of ends; at least one power supply wherein the plurality of ends of the coil are electrically connected to the power supply, the power supply being configured to supply an adjustable and reversible D.C. electric current to the coil; a controller being configured to adjust the amount of current supplied to the coil during operation based on a characteristic of the document to be authenticated; and a sensor between the first pole piece and the second pole piece, the sensor being adapted to sense the flux measurement of the document being transported. - View Dependent Claims (22, 23, 24, 25)
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26. A magnetic detection system for authenticating a document, the magnetic detection system comprising:
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a first magnetic scanhead being adapted to create a first magnetic field for saturating the magnetization of an area on the document; a second magnetic scanhead including an electromagnet, the electromagnet being configured to create a magnetic field of adjustable intensity, the second magnetic field being of opposite polarity from the first magnetic field; and a controller being adapted to automatically adjust the second magnetic field by changing the amount of current supplied to the electromagnet, wherein the controller is adapted to adjust the supplied current during operation based on a sensed characteristic of the document to be authenticated. - View Dependent Claims (27, 28, 29)
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30. A method for determining the authenticity of currency bills, the method comprising the acts of:
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creating a first magnetic field for saturating the magnetization of an area on a currency bill; measuring the magnetic flux of the area on the bill in response to the first magnetic field; creating a second magnetic field of opposite polarity from the first magnetic field; adjusting the intensity of the second magnetic field based on the denomination of the bill, the second magnetic field being of opposite polarity from the first magnetic field; measuring the magnetic flux of the area on the bill in response to the second magnetic field; and determining a flux ratio of the first magnetic flux measurement to the second magnetic flux measurement. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A method for authenticating a document using a magnetic detection system, the method comprising the acts of:
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configuring a first magnetic scanhead to create a first magnetic field for saturating the magnetization of an area on the document; configuring an electromagnet of a second magnetic scanhead to create a second magnetic field of adjustable intensity, the second magnetic field being of opposite polarity from the first magnetic field; detecting a characteristic of the document to be authenticated; and automatically adjusting the intensity of the second magnetic field by changing the amount of current supplied to the electromagnet based upon the detected characteristic of the document to be authenticated. - View Dependent Claims (38, 39)
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Specification