Nested Cylindrical Magnetic Shielding for Signal Accuracy
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Solution Overview
Problem
Conventional magnetic shielding apparatuses require large spaces, are costly, and suffer from inefficiencies in shielding magnetic flux density components perpendicular to the cylinder axis, leading to distorted signal measurements and positional errors.
Innovation Solution
A dual-cylinder magnetic shielding apparatus with one cylinder open at both ends and a second cylinder with one end open, positioned perpendicularly to the first, to enhance shielding efficiency and correct signal distortions using a magnetic sensor inside the second cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large space is covered with high permeability material to achieve magnetic shielding, then magnetic shield effect is improved, but occupied space and device size increase
Solution Approach 1:
The patent employs nested cylindrical structures where multiple high permeability cylindrical shells are arranged concentrically with different diameters. Each cylinder is positioned inside the previous one, creating a compact nested configuration that achieves effective magnetic shielding while minimizing the overall occupied space. This nesting approach allows the magnetic shield to contain itself within a smaller volume compared to conventional single-layer shields.
Solution Approach 2:
The patent introduces a multi-dimensional shielding approach by arranging cylindrical shields at different radial dimensions and orientations. Rather than expanding in a single direction, the nested cylinders create shielding effectiveness through dimensional layering, where each cylindrical layer contributes to shielding in its specific dimensional space, thereby achieving comprehensive coverage without proportional volume increase.
2Volume of stationary object
If circular cylinders with different diameters are sequentially concentrically arranged to reduce occupied space, then device size is reduced, but magnetic shield effect in axial direction deteriorates
Solution Approach 1:
The patent applies local quality enhancement by positioning specific cylindrical shields with optimized dimensions and permeability properties at different locations within the nested structure. Each cylinder is tailored with specific local characteristics (different diameters, lengths, and permeability values) to address the magnetic flux density distribution requirements in different spatial regions, particularly enhancing shielding effectiveness in the axial direction where it was previously weak.
Solution Approach 2:
The patent employs composite magnetic shielding structures by combining multiple high permeability materials with different magnetic properties in the nested cylindrical arrangement. Each cylindrical layer may utilize materials with different permeability characteristics, creating a composite shielding system that leverages the strengths of individual materials to achieve superior overall shielding performance, particularly in directions where single materials perform inadequately.
3Reliability
If high permeability material is disposed in vicinity of measurement portion to enhance magnetic shield effect, then magnetic shield effect is improved, but measurement signal is distorted
Solution Approach 1:
The patent introduces an intermediary computational correction process that mediates between the magnetic shielding structure and the measurement system. The magnetic flux density distribution measured by sensors is processed through correction calculations that account for the distorting influence of nearby high permeability materials. This computational intermediary restores measurement accuracy by mathematically compensating for the shielding-induced distortions, allowing both effective shielding and precise measurement to coexist.
4Reliability
If permalloy plates are used to fabricate magnetic shield room, then magnetic shield effect is achieved, but fabrication time and cost increase
Solution Approach 1:
The patent segments the magnetic shielding structure into multiple discrete cylindrical components with different diameters that can be independently manufactured and then assembled in a nested configuration. This segmentation allows for more efficient fabrication of individual cylindrical shells compared to constructing a large integrated shield room, reducing overall fabrication time and complexity while maintaining effective magnetic shielding through the segmented nested arrangement.
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 solution allows for a smaller, more efficient magnetic shielding apparatus with improved shielding efficiency, reducing signal distortion and enabling accurate signal source positioning.
Implementation Method 1
a partial space within the magnetically shielding apparatus is covered with the high permeability magnetic body to enhance the magnetic shield effect of the partial space
Data Source
AI summary
As the length of a cylinder of a magnetically shielding apparatus is shorter, the amount of magnetism of a component perpendicular to an axis of the cylinder which enters the opening portion of the cylinder is larger, resulting in a lower magnetic shield effect. A second magnetically shielding apparatus is formed in a cylinder with both ends or one direction close to an object to be measured being opened, and is disposed within a first magnetically shielding apparatus. An axial direction of the cylinder is substantially parallel to the magnetic flux density detection direction. The magnetic sensor, which conducts magnetic signal measurement and is disposed within the cylinder, is in the first magnetically shielding apparatus formed in a cylinder having both open ends, to thereby shield a magnetic flux density component that cannot be shielded by the first magnetically shielding apparatus by the periphery of the magnetic sensor.