Sensor element, test device and method for testing data carriers having a spin resonance feature
AssigneeGiesecke+Devrient Currency Technology GmbH
InventorStephan Huber
Life of this patent
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Abstract
A sensor element for testing a flat data carrier, in particular a banknote, has a spin resonance feature. The sensor element contains a magnetic core having an air gap, into which the flat data carrier can be inserted for testing, an element for generating a static magnetic flux in the air gap, and a resonator for exciting the spin resonance feature of the data carrier to be tested. The resonator is formed by a microstrip line resonator which is arranged in the air gap of the magnetic core and comprises a flat carrier having an upper side and a conducting structure which is arranged on the upper side of the carrier with a characteristic length.
Claims15
A sensor element for testing a flat data carrier, comprising:
- a magnetic core having an air gap into which the flat data carrier is insertable for the test,
- an element for generating a static magnetic flux in the air gap, and
- a resonator for exciting a spin resonance feature of the data carrier under test,
- wherein the resonator is formed by a microstrip line resonator which is arranged in the air gap of the magnetic core and which has a flat carrier with an upper side and an opposing lower side,
- wherein a conducting structure having a characteristic length l is arranged on the upper side,
- wherein the microstrip line resonator is designed for excitation of spin resonance signals having a frequency between 1 GHz and 100 GHz.
A method for testing a flat data carrier having a spin resonance feature by means of a sensor element, in which the following steps are carried out:
- providing the flat data carrier;
- feeding the flat data carrier into an air gap of a magnetic core of the sensor element;
- exciting the spin resonance feature of the flat data carrier by means of a microstrip line resonator of the sensor element arranged in the air gap of the magnetic core;
- capturing a measurement signal which is characteristic of the spin resonance feature by means of the microstrip line resonator;
- and
- testing the flat data carrier by means of the captured measurement signal,
- wherein the microstrip line resonator is designed for excitation of spin resonance signals having a frequency between 1 GHz and 100 GHz.
Dependencies are inferred from the claim text.