Methods and device for checking value documents
AssigneeGiesecke+Devrient Currency Technology GmbH
InventorsJan Domke, Hans-Uwe Moosler, Klaus Thierauf
Life of this patent
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Abstract
A method for examining a value document includes emitting ultrasonic pulses onto several locations on the value document. An echo pulse arises by reflection of at least a portion of a respective ultrasonic pulse at the value document. The echo pulses are received while forming echo values, and from the echo values at least a characteristic value is established as to the wrinkledness of the value document. As apparatus is provided for carrying out the method.
Claims19
A method for examining a value document, the method comprising:
- emitting ultrasonic pulses onto several locations on the value document, and respectively an echo pulse arising by reflection of at least a portion of a respective ultrasonic pulse at the value document;
- receiving the echo pulses and forming echo values corresponding to said echo pulses, and
- establishing from the echo values at least a characteristic value as to a wrinkledness of the value document;
- wherein the ultrasonic pulses are emitted at a first side of the value document and the echo pulses are received at a second side opposing the first side of the value document.
An apparatus for examining a value document transported along a transport path, having
- a transmitting device which has at least one ultrasonic transmitting element and is devised for emitting ultrasonic pulses to different locations on a value document in the transport path,
- a receiving device which has at least one ultrasonic receiving element and is devised for receiving echo pulses which have arisen from the ultrasonic pulses emitted by the transmitting device by reflection at the value document in the transport path, and for forming echo values, and
- an evaluation device which is configured to establish from the echo values a characteristic value for a wrinkledness of the value document;
- wherein the transmitting device is configured to emit the ultrasonic pulses at a first side of the value document and the receiving device is configured to receive the echo pulses at a second side opposing the first side of the value document.
Dependencies are inferred from the claim text.