Sensor element and device for authenticating a data carrier having a spin resonance feature
AssigneeGiesecke+Devrient Currency Technology GmbH
InventorsStephan Huber, Christian Schuller
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Abstract
A sensor element for checking the authenticity of a flat data carrier, in particular a banknote, with a spin resonance feature, includes a magnetic core with an air gap into which the flat data carrier is insertable for authenticity checking, an element for generating a static magnetic flux in the air gap, a modulation coil for generating a time-varying magnetic field in the air gap, and a resonator for exciting the spin resonance feature of the data carrier to be checked and for capturing the signal response of the spin resonance feature. The magnetic core of the sensor element is at least partially formed of an eddy current damping magnetic material.
Claims13
A sensor element for checking a flat data carrier, with a spin resonance feature, with
- a magnetic core with an air gap into which the flat data carrier is insertable for authenticity checking,
- an element for generating a static magnetic flux in the air gap,
- a modulation coil for generating a time-varying magnetic field in the air gap, and
- a resonator for exciting the spin resonance feature of the data carrier to be checked and for capturing the signal response of the spin resonance feature,
- an evaluation unit which is adapted to generate a check result on the basis of the captured signal response of the spin resonance feature,
- wherein the magnetic core is formed at least in part of an eddy current damping magnetic material, and
- wherein the element for generating a static magnetic flux comprises at least one permanent magnet.
Dependencies are inferred from the claim text.