Laminated Body Defect Detection Using Magnetic Field Diffusion
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Solution Overview
Problem
Existing methods face challenges in analyzing the internal structure of laminated bodies, particularly those with multiple layers, and in evaluating defects within batteries without a comparison value, using magnetic fields.
Innovation Solution
A measurement device and method that applies pulse currents or currents of multiple frequencies to a laminated body, acquiring in-plane magnetic field distribution information, generating three-dimensional magnetic field distribution data, and processing this data to identify defects within the body using averaged and continuous diffusion-type partial differential equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic field measurement methods are used, then measurement simplicity is maintained, but measurement precision and ability to detect internal defects in laminated bodies deteriorates
Solution Approach 1:
The patent transforms two-dimensional magnetic field distribution measurements into three-dimensional internal structure information by solving diffusion equations. The measurement system captures magnetic field distributions at multiple positions and uses mathematical transformation to reconstruct internal defect information, effectively adding a dimensional transformation from surface measurement to internal visualization.
Solution Approach 2:
The patent introduces diffusion equations as an intermediary mathematical model between the measured magnetic field data and the internal defect information. This intermediary framework allows transformation of external magnetic field measurements into internal structure characterization without direct physical contact or complex internal sensors.
2Loss of information
If simple magnetic field measurement is used, then ease of operation is maintained, but information completeness on internal structure deteriorates
Solution Approach 1:
The patent performs preliminary mathematical processing by solving diffusion equations before final defect identification. The system pre-processes magnetic field distribution data at multiple measurement positions to generate three-dimensional internal information, preparing the data in advance for accurate defect localization and characterization.
Solution Approach 2:
The patent replaces direct physical measurement of internal structures with mathematical field transformation. Instead of using complex mechanical probing or invasive sensors inside the laminated body, the system uses magnetic field measurements combined with diffusion equation solving to substitute and infer internal conditions.
3Adaptability or versatility
If conventional inspection methods are used, then device complexity is low, but ability to evaluate multilayer structures deteriorates
Solution Approach 1:
The patent applies local quality analysis by solving diffusion equations with boundary conditions specific to each measurement position and orientation. The system characterizes local magnetic field distributions at different locations on the laminated body surface and uses these localized measurements to reconstruct global three-dimensional internal structure information.
Solution Approach 2:
The patent creates a universal measurement framework that can evaluate various types of laminated structures regardless of layer composition or defect type. The diffusion equation-based approach provides a multi-functional solution that adapts to different material combinations and defect configurations through boundary condition adjustments.
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
Enables non-destructive evaluation and defect identification within laminated bodies, providing detailed internal information and improving the analysis of multilayer structures.
Implementation Method 1
a current applying unit (120) which applies a pulse current or a current of a plurality of frequencies to a laminated body (20)
Implementation Method 2
an acquisition unit (140) which acquires in-plane distribution information including at least information indicating distribution of a magnetic field
Implementation Method 3
the equation is an averaged and continuous diffusion type partial differential equation of the laminated body
Data Source
AI summary
A measurement device applies a pulse current or a current of a plurality of frequencies to a laminated body having a plurality of layers having different electrical conductivities. The device acquires in-plane distribution information indicating distribution of a magnetic field of a first plane outside the laminated body. A processor generates three-dimensional magnetic field distribution information indicating a three-dimensional distribution of magnetic field on an outside of the laminated body based on the in-plane distribution information, and generates information on an inside of the laminated body by processing the three-dimensional magnetic field distribution information on the outside of the laminated body. The in-plane distribution information includes information indicating response characteristics to a change in the current applied by the current applying unit. In addition, the three-dimensional magnetic field distribution information on the outside of the laminated body includes frequency characteristics of the magnetic field.