Spin Resonance Sensor Core With Switchable Magnetic Reluctance
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Solution Overview
Problem
Existing sensor elements for testing flat data carriers with spin resonance features face difficulties in assembly, disassembly, and storage due to high magnetic forces and stray fields, posing safety hazards and complicating maintenance tasks.
Innovation Solution
Incorporation of magnetic potentiometers that can switch between two states, allowing for reduced disassembly forces and stray fields by redirecting magnetic flux, enabling safe and easy assembly and disassembly of the sensor element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the polarization field B0 is maximized to increase spin resonance signal strength, then measurement sensitivity is improved, but disassembly forces and stray fields increase making assembly and storage difficult
Solution Approach 1:
The magnetic circuit incorporates adjustable magnetic potentiometers that allow dynamic switching between two operational states: a first state for measurement where the polarization field is maximized for high signal strength, and a second state for assembly/disassembly where the magnetic flux is redistributed to minimize disassembly forces. This dynamic adaptability resolves the contradiction by optimizing the magnetic circuit configuration according to the current operational requirement.
Solution Approach 2:
The invention changes the magnetic resistance parameter of the magnetic circuit by adjusting the magnetic potentiometers. In the measurement state, the potentiometers are positioned to minimize magnetic resistance in the polarization path, maximizing B0 field strength. In the assembly state, the potentiometers are adjusted to redistribute flux and minimize forces at the disassembly gap, thereby changing the effective parameters of the magnetic circuit to suit different operational phases.
2Measurement precision
If the polarization field B0 is maximized to increase spin resonance signal strength, then measurement sensitivity is improved, but stray fields increase attracting magnetizable parts during storage
Solution Approach 1:
The magnetic circuit is designed with adjustable magnetic potentiometers that enable dynamic control of flux distribution. During measurement, the potentiometers configure the circuit for maximum polarization field strength. During storage, the potentiometers are adjusted to a second configuration that minimizes stray fields by redirecting magnetic flux through alternative paths, thereby eliminating the harmful attraction of magnetizable parts while maintaining measurement capability when needed.
3Measurement precision
If large disassembly forces are required to maintain high polarization field, then measurement performance is maintained, but assembly and maintenance become hazardous
Solution Approach 1:
The magnetic circuit incorporates adjustable magnetic potentiometers that allow dynamic switching between two operational states: a first state for measurement where the polarization field is maximized for high signal strength, and a second state for assembly/disassembly where the magnetic flux is redistributed to minimize disassembly forces. This dynamic adaptability resolves the contradiction by optimizing the magnetic circuit configuration according to the current operational requirement.
Solution Approach 2:
The magnetic potentiometers act as intermediary elements that control and regulate the magnetic flux distribution within the circuit. By adjusting the potentiometers, the flux can be redirected through intermediate paths that bypass the disassembly gap during assembly operations, thereby mediating between the requirement for high measurement performance and the need for safe, easy assembly.
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
Significantly reduces disassembly forces by up to 50% and stray fields, facilitating safer and more efficient handling of the sensor element during assembly, disassembly, and maintenance tasks without compromising the measurement capability.
Implementation Method 1
a magnetic circuit is often used to direct the magnetic flux from permanent magnets and/or coils to the air gap in which the banknote verification takes place
Implementation Method 2
a quasi-static polarization field B0 that runs parallel to the axial direction (z-direction) of the air gap of a magnetic circuit
Implementation Method 3
nuclear magnetic resonance (NMR)
Implementation Method 4
electron spin resonance (ESR)
Implementation Method 5
ferromagnetic or ferrimagnetic resonance (FMR)
Implementation Method 6
the magnetic core has at least one magnetic potentiometer that can be switched between two states, wherein the magnetic potentiometer has a first magnetic resistance in a first state and the sensor element is configured in the first state of the magnetic potentiometer to measure a spin resonance feature
Data Source
Figure 1~2
Figure 3(a)~3(c)
Figure 4(a)~4(b)
AI summary
The invention relates to a sensor element (10) for testing a planar data carrier (10), in particular a banknote, having a spin resonance feature. The sensor element (10) comprises a magnetic core (20) having an air gap (24), into which the planar data carrier is introducible for the purpose of testing, and having at least one dividing gap (30), along which the magnetic core (20) is divisible into two or more parts. The sensor element also comprises a polarization device (22) for generating a static magnetic flux in the air gap (24). In this case, the invention provides for the magnetic core (20) to have at least one magnetic potentiometer (32) that is switchable between two states. In this case, the magnetic potentiometer (32) in a first state has a first magnetic reluctance and, in the first state of the magnetic potentiometer (32), the sensor element (10) is set up for a measurement on a spin resonance feature of a data carrier introduced into the air gap (24). The magnetic potentiometer (32) in a second state has a second, different magnetic reluctance and, in the second state of the magnetic potentiometer (32), the sensor element (10) is set up for a division of the magnetic core along the dividing gap (30).