Superconducting Coil Group Magnetic Shielding
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Solution Overview
Problem
Current magnetic field shielding systems based on Helmholtz coil structures are complex to manufacture and connect, making them inconvenient for practical applications, especially in biomagnetic measurements where high precision is required to filter out noise signals.
Innovation Solution
A magnetic field shielding system comprising a first and second stage superconducting coil forming a closed loop, with adjustable radius and turns ratios, allowing for flexible topological configurations and simplified assembly, which can shield more than 90% of external magnetic fields without relying on the Helmholtz coil structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Helmholtz coil structure is used for magnetic field shielding, then shielding effect is achieved, but manufacturing complexity and assembly difficulty increase significantly
Solution Approach 1:
The patent extracts the essential shielding function from the complex Helmholtz coil structure by using a single superconducting coil with high magnetic permeability material. This removes the need for multiple coils and complex connections while maintaining the core shielding capability through the intrinsic properties of the superconducting material and its magnetic field generation ability.
Solution Approach 2:
The patent changes the key parameter from using multiple coils with specific radius and turns ratios to using a single coil with optimized magnetic permeability material properties. By adjusting the magnetic permeability parameter of the material and the current parameters in the superconducting coil, the shielding effect is achieved without requiring complex multi-coil configurations.
2Object-affected harmful factors
If four Helmholtz coils are connected together to achieve shielding, then magnetic field cancellation is improved, but connection difficulty and manufacturing complexity increase
Solution Approach 1:
The patent merges the function of four separate Helmholtz coils into a single superconducting coil structure. By combining the magnetic field generation capability and the high magnetic permeability material into one integrated component, the need for complex connections between multiple coils is eliminated while maintaining noise cancellation effectiveness.
Solution Approach 2:
The superconducting coil with high magnetic permeability material serves itself to generate the necessary magnetic field and provide shielding without requiring external connection to multiple other coils. The single coil structure inherently provides the shielding function through its own magnetic field generation and material properties, eliminating the need for complex inter-coil connections.
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 system provides effective magnetic field shielding with reduced complexity in manufacturing and assembly, enabling flexible topological configurations and efficient noise reduction in biomagnetic measurements.
Implementation Method 1
comprises a superconducting coil group and a protected object, wherein the superconducting coil group is used to generate a magnetic field for shielding
Implementation Method 2
closed superconducting coil groups
Data Source
AI summary
A magnetic field shielding system includes a first stage superconducting coil and a second stage superconducting coil. The first stage superconducting coil and the second stage superconducting coil are coaxial, coplanar and electrically connected in series to form a closed loop; the first stage superconducting coil has a first radius R1, the second stage superconducting coil has a second radius R2, and R1>R2; a radius ratio α between the first radius R1 and the second radius R2 is: α=R1/R2; the first stage superconducting coil has N1 turns; the second stage superconducting coil has N2 turns; a turns ratio β between N1 and N2 is: β=N1/N2; and the radius ratio α satisfies: α≥2; the turns ratio β satisfies: 0.01≤β≤20.