Permalloy Shielding Evaluation for Magnetically Shielded Rooms
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Solution Overview
Problem
There is a lack of in-depth research on the shielding effect of permalloy in magnetically-shielded rooms, leading to failure to satisfy the requirements of different application scenarios for magnetic field shielding.
Innovation Solution
A performance testing and evaluation method for permalloy material, involving quality inspection, experimental setup, magnetic field generation and measurement, real-time monitoring, and Fast Fourier analysis to quantify shielding effect, permeability, hysteresis, and other key parameters, followed by comparative experiments and simulation to optimize magnetically-shielded room design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ferromagnetic material is used for construction of magnetically-shielded room, then shielding performance is improved, but construction cost and weight increase
Solution Approach 1:
The patent changes the material parameter from traditional ferromagnetic material to permalloy alloy, which has different magnetic properties (higher permeability, lower coercivity). This parameter change enables achieving the required shielding performance with lighter weight and lower cost, directly resolving the contradiction between shielding performance and construction weight
Solution Approach 2:
The patent uses permalloy, a composite nickel-iron alloy material, which combines the advantages of both nickel (corrosion resistance, permeability) and iron (magnetic properties, cost-effectiveness). This composite material approach achieves optimal balance between shielding performance, weight, and cost, resolving the technical contradiction
2Reliability
If traditional ferromagnetic material is used for construction of magnetically-shielded room, then shielding performance is improved, but construction cost increases
Solution Approach 1:
The patent changes the material parameter from traditional ferromagnetic material to permalloy alloy, which has different magnetic properties (higher permeability, lower coercivity). This parameter change enables achieving the required shielding performance with lighter weight and lower cost, directly resolving the contradiction between shielding performance and construction cost
Solution Approach 2:
The patent adopts permalloy material which is more cost-effective than traditional ferromagnetic materials. By using this alternative material, the construction cost is reduced while maintaining the required shielding performance, directly addressing the cost concern in the contradiction
3Weight of stationary object
If permalloy material is used instead of traditional ferromagnetic material, then weight and cost are reduced, but shielding effect requires verification and evaluation
Solution Approach 1:
The patent performs preliminary quality inspection on permalloy samples before conducting shielding performance tests. This includes checking material composition, permeability, and other key parameters to ensure the material meets specifications. This preliminary action ensures accurate and reliable evaluation results, resolving the contradiction between weight reduction and evaluation precision
Solution Approach 2:
The patent uses electromagnetic field measurement methods instead of traditional mechanical testing to evaluate shielding performance. By employing magnetic field sensors and electromagnetic induction principles, the evaluation achieves high precision while being non-destructive and efficient, thus resolving the contradiction between weight reduction and measurement precision
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
Provides a fast, accurate, and easy-to-operate method for evaluating permalloy performance, enabling effective magnetically-shielded room design that meets diverse application scenarios, with reduced evaluation time and cost, and improved shielding effectiveness.
Implementation Method 1
by adjusting a current of the magnetic field generation coil, generating magnetic fields with different strengths and frequencies
Implementation Method 2
performing real-time monitoring on a size of the magnetic field shielded by permalloy plates
Implementation Method 3
by using the magnetic field sensor, performing real-time monitoring on a size of the magnetic field shielded by permalloy plates
Implementation Method 4
performing Fast Fourier analysis on data collected by the magnetic field sensor to obtain a valid value of the magnetic field corresponding to the applied frequency
Data Source
AI summary
There is provided a performance testing and evaluation method for a permalloy material for construction of a magnetically-shielded room and relates to testing and evaluation on alloy shielding performance. The present disclosure aims to solve the problem of failure to satisfy the requirements of different application scenarios for the magnetic field shielding due to lack of in-depth research on the shielding effect of the current permalloy in the magnetically-shielded rooms. The method includes: at step 1, selecting a permalloy sample, and conducting quality inspection on the sample to ensure the sample is compliance with an experiment requirement; at step 2, setting up an experimental apparatus; where the permalloy sample is vertically placed, and a magnetic field generation coil and a magnetic field measuring sensor are respectively placed at left and right sides of the permalloy sample; at step 3, carrying out shielding performance testing and evaluation on the permalloy sample.