Segmented Shielding for Subtle Magnetic Field Measurement
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Solution Overview
Problem
Existing shield apparatuses for measuring subtle magnetic fields face challenges with eddy currents generated by high-conductivity metal layers and difficulties in demagnetizing soft magnetic layers, leading to inaccurate measurements and increased manufacturing costs.
Innovation Solution
The shield apparatus features a high-conductivity metal layer partitioned into segments to prevent eddy current flow and includes coil units wound around corners of a high-permeability soft magnetic layer for efficient demagnetization using a power supply unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-conductivity metal layer is used to shield high-frequency magnetic fields, then shield effectiveness is improved, but eddy currents are generated when strong magnetic fields are applied, interfering with subtle magnetic field measurements
Solution Approach 1:
The high-conductivity metal layer is divided into multiple segments separated by insulating gaps, which interrupt the eddy current paths while maintaining the continuous shielding structure. This segmentation prevents large-scale eddy current circulation that would generate interfering magnetic fields, while still providing effective high-frequency magnetic field shielding through the distributed conductive segments.
2Reliability
If coil units are inserted inside the shield room to demagnetize the soft magnetic layer, then demagnetization capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The demagnetization function is extracted from the internal space of the shield room and integrated into the shield wall structure itself. Coil units are embedded within the shield walls rather than being placed inside the measurement space, eliminating the need for separate internal demagnetization equipment and simplifying the overall device architecture.
Solution Approach 2:
The demagnetization coil units are merged with the shield wall structure, combining the shielding and demagnetization functions into a single integrated component. This integration reduces the total number of separate parts and simplifies manufacturing by consolidating functions that were previously implemented as separate systems.
3Reliability
If coil units are inserted inside the shield walls, then demagnetization is achieved, but the induced magnetic field may not reach the corners of the shield room, limiting demagnetization effectiveness
Solution Approach 1:
Coil units are strategically positioned at the corners of the shield room where magnetic field penetration is most difficult, rather than distributing them uniformly. This asymmetric placement targets the specific problem areas (corners) that require enhanced demagnetization capability, ensuring complete coverage of the measurement space.
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
This configuration minimizes the effect of eddy currents on magnetic field measurements and effectively demagnetizes the soft magnetic layer, ensuring precise measurement of subtle magnetic fields while reducing manufacturing complexity and costs.
Implementation Method 1
an eddy current shield effect obtained using a metal of high electrical conductivity
Implementation Method 2
a magnetic field shield effect obtained using a soft magnetic material of high permeability
Data Source
AI summary
The present invention relates to a shield apparatus and a shield method for measuring a subtle magnetic field. More specifically, the present invention relates to a shield apparatus having a precise magnetic sensor therein, for shielding an external magnetic field in a subtle magnetic field measurement apparatus including a magnetic field generation apparatus for exciting a sample, the shield apparatus for measuring a subtle magnetic field, including: a shield wall provided with a high-conductivity metal layer of high conductivity being partitioned into a plurality of segments and having a high-frequency shield property and a closed high-permeability soft magnetic layer spaced apart from the high-conductivity metal layer by a predetermined distance, so as to seal a measurement space.