Spin Resonance Sensor Core for Fast Banknote Authentication
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Solution Overview
Problem
Existing technologies face challenges in reliably authenticating data carriers with spin resonance features, particularly when the data carriers are moving rapidly.
Innovation Solution
A sensor element is designed with a magnetic core containing eddy current damping magnetic materials, which includes a magnetic core with an air gap, a static magnetic flux generator, a modulation coil, and a resonator to excite and capture spin resonance signals from the data carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a magnetic core with high electrical conductivity (e.g., soft iron) is used to generate strong magnetic fields for spin resonance detection, then the magnetic field strength is improved, but eddy currents are generated that cause energy dissipation and reduce measurement reliability for rapidly moving data carriers
Solution Approach 1:
The magnetic core is constructed from composite materials combining soft magnetic material (for high permeability and strong magnetic field generation) with electrically insulating material (to suppress eddy currents). This composite structure resolves the contradiction by allowing the magnetic core to maintain high magnetic field strength while minimizing energy loss from eddy currents, enabling reliable spin resonance detection of rapidly moving data carriers.
2Productivity
If the data carrier moves rapidly through the sensor, then productivity is improved, but the measurement precision of the spin resonance signal deteriorates due to reduced interaction time and increased eddy current effects
Solution Approach 1:
The composite magnetic core structure enables the system to handle rapidly moving data carriers by suppressing eddy currents that would otherwise distort the spin resonance signal. This allows high authentication speed while maintaining measurement precision, as the insulating material prevents harmful eddy currents even during rapid relative motion between the sensor and data carrier.
Solution Approach 2:
The patent converts the potentially harmful eddy current effect into a beneficial diagnostic tool by using the pattern of eddy current suppression to verify authenticity. The spin resonance feature is designed to interact with the magnetic core in a specific way that produces a characteristic signal pattern, allowing the system to distinguish genuine security features from counterfeits even during rapid movement.
3Device complexity
If conventional magnetic materials are used in the magnetic core, then the device complexity is kept simple, but the reliability of authenticity checking deteriorates due to interference from eddy currents during rapid data carrier movement
Solution Approach 1:
The magnetic core uses a composite structure of soft magnetic material and electrically insulating material arranged in alternating layers or patterns. This design maintains relative structural simplicity while dramatically improving reliability by suppressing eddy currents. The layered composite structure is straightforward to manufacture and integrates seamlessly into existing sensor designs, achieving high reliability for authenticity checking of rapidly moving data carriers without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sensor element effectively suppresses eddy currents, allowing for accurate authentication of rapidly moving data carriers with improved signal-to-noise ratio and reduced energy dissipation, thereby enhancing the reliability and efficiency of the authentication process.
Implementation Method 1
The magnetic core of the sensor element is at least partially formed of an eddy current damping magnetic material
Implementation Method 2
resonant excitation is referred to as nuclear spin resonance (Nuclear Magnetic Resonance, NMR) or electron spin resonance (ESR)
Implementation Method 3
a modulation coil for generating a time-varying magnetic field in the air gap
Implementation Method 4
an element for generating a static magnetic flux in the air gap
Data Source
AI summary
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.