Mu-metal and Copper Shielding Plug for EMF Channels
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Solution Overview
Problem
Electromagnetic field channels lack a plug to prevent external signals from entering and electromagnetic fields from escaping, compromising shielding capabilities and allowing for modular configurations in healthcare and research applications.
Innovation Solution
A plug with Mu-metal and copper layers, spaced apart with air gaps, provides effective shielding by attenuating magnetic and electrical fields, and is designed to fit within electromagnetic field channels, using a tubular body with an outer plastic layer for structural support and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plug is installed in an electromagnetic field channel, then shielding capabilities are improved by preventing external signals from entering and internal fields from escaping, but device complexity increases due to the additional plug component
Solution Approach 1:
The plug is segmented into multiple functional layers including Mu-metal layers for magnetic field shielding, copper layers for electrical field shielding, and air gaps for insulation. This segmentation allows each layer to perform its specific shielding function while maintaining overall system reliability without requiring a monolithic complex structure.
Solution Approach 2:
The plug employs a nested structure where Mu-metal layers and copper layers are stacked within the tubular body, with each layer nested within the previous one. This nesting approach provides comprehensive electromagnetic shielding across multiple frequency ranges while minimizing the overall volume and complexity of the plug component.
2Adaptability or versatility
If multiple electromagnetic channels are provided on an omnibus device, then measurement versatility is improved by enabling sensing at different locations, but shielding integrity deteriorates when channels are left empty as external signals can enter and dilute adjacent channel measurements
Solution Approach 1:
The plug is designed as a universal component that can be inserted into any empty electromagnetic channel of the omnibus device. It provides multi-functional shielding against both magnetic fields (via Mu-metal) and electrical fields (via copper layers), maintaining shielding integrity across all channels regardless of whether they are currently in use or left empty.
Solution Approach 2:
The plug acts as an intermediary element that fills the empty channels between active sensing channels. It mediates the electromagnetic interference by blocking external signals from entering empty channels and preventing internal field leakage, thereby preserving the shielding integrity of adjacent active channels while allowing the omnibus device to maintain its modular multi-channel configuration.
3Reliability
If Mu-metal and copper layers are spaced apart with air gaps, then shielding effectiveness is improved through critical insulation and field reflection, but manufacturing precision requirements increase to maintain the spaced apart relation
Solution Approach 1:
The plug applies local quality by providing different material properties at different locations within the tubular body. Mu-metal layers are positioned for magnetic field attenuation, copper layers for electrical field attenuation, and air gaps are strategically placed for insulation. This localized material assignment optimizes shielding effectiveness for specific frequency ranges and field types while maintaining manufacturability through standardized layer thicknesses.
Solution Approach 2:
The plug utilizes composite materials by combining Mu-metal, copper, and air gaps in a layered structure. This composite approach leverages the complementary properties of each material: Mu-metal for magnetic field shielding, copper for electrical field shielding, and air gaps for insulation and field reflection. The composite structure achieves superior shielding effectiveness across multiple electromagnetic spectrum ranges while maintaining practical manufacturing precision through established material fabrication techniques.
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 plug effectively prevents electromagnetic interference, maintaining shielding integrity and allowing for modular placement of EMF sensors to measure different areas while preserving the shielding capabilities of the channel.
Implementation Method 1
Multi-layered nickel-iron soft ferromagnetic alloy, such as Mu-metal®, copper mesh, and plastic provide substrate in the exact dimensions to fill the void inside the electromagnetic channel when a sensor is not present
Implementation Method 2
copper mesh, and plastic provide substrate in the exact dimensions to fill the void inside the electromagnetic channel when a sensor is not present
Implementation Method 3
Air gaps between the two stacks provide critical insulation
Data Source
AI summary
A plug for an electromagnetic field channel. The plug may have a tubular body capped at one end. The body may be composed of a plurality of coaxial layers, including electromagnetically inert outermost and innermost layers. A MU-metallic second layer may be wrapped by the outermost electromagnetically inert layer, and a copper third layer may be wrapped by the innermost electromagnetically inert layer. An air gap may be disposed between the second and third layers.