ECT Sensor Structure Optimization for Moisture Monitoring
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Solution Overview
Problem
Current ECT sensors lack effective methods for optimizing structural parameters and accurately calculating electromagnetic field distributions in concrete structures, limiting their ability to provide precise moisture content monitoring and durability analysis.
Innovation Solution
A method involving eight steps using COMSOL software for parameter setting, geometric and material definition, mesh generation, physical field setup, solution calculation, and sensor structure optimization to achieve accurate electromagnetic field analysis and optimization of ECT sensor structures for improved moisture content monitoring in concrete components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional analytical methods are used to solve the forward problem of ECT imaging, then the derivation process becomes complicated and accurate field models are difficult to establish, but this approach was traditionally pursued for theoretical completeness
Solution Approach 1:
The patent replaces traditional analytical mathematical derivation methods with numerical simulation methods (finite element method). This substitution transforms the complicated analytical derivation process into a computational approach that can be efficiently solved using software, thereby improving solution speed while reducing derivation complexity.
Solution Approach 2:
The patent changes the solution approach from analytical parameters to numerical parameters. By using numerical simulation with discretized elements, the method transforms the continuous field problem into a discrete parameter problem that can be efficiently computed, improving both solution speed and reducing the complexity of field model establishment.
2Measurement precision
If the ECT sensor structure is not optimized, then the sensitive field uniformity is poor affecting image quality, but structural optimization requires complex calculations and time-consuming adjustments
Solution Approach 1:
The patent performs preliminary structural optimization of the ECT sensor using numerical simulation before actual measurement. By pre-calculating the optimal sensor structure and sensitive field distribution through finite element analysis, the method eliminates the need for time-consuming trial-and-adjustment processes during actual operation, thereby improving image quality while reducing optimization time.
Solution Approach 2:
The patent creates a virtual copy of the ECT sensor structure in the form of a finite element model. This digital twin allows for rapid simulation and optimization of the sensor structure without physical modifications, enabling quick evaluation of different structural parameters and their impact on sensitive field uniformity, thus improving image quality efficiently.
3Measurement precision
If accurate electromagnetic field calculation is not performed, then moisture content monitoring accuracy is compromised, but complex calculation methods are time-consuming and computationally intensive
Solution Approach 1:
The patent transforms the electromagnetic field calculation from analytical parameter-based methods to numerical parameter-based finite element methods. This allows for accurate calculation of electromagnetic field distribution in complex concrete structures while improving calculation speed through efficient numerical algorithms and computational optimization.
Solution Approach 2:
The patent divides the continuous electromagnetic field problem into discrete finite elements for calculation. By segmenting the measurement domain into smaller computational units, the method achieves accurate electromagnetic field calculation while reducing computational complexity and improving calculation speed through parallel processing and optimized numerical algorithms.
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 approach simplifies the calculation process, enhances measurement accuracy, and provides a theoretical basis for visual monitoring and durability analysis of concrete structures by optimizing sensor parameters and analyzing electromagnetic fields, offering a new concept for ECT system design and analysis.
Implementation Method 1
capacitance between electrode pairs i and j for solving the forward problem is: Cij=Q/(φi-φj) where φi-φj is a potential difference between an excitation electrode i and a measuring electrode j, A represents an area of a closed region of the electrode j, and Q represents a quantity of induced charges on the electrode j
Implementation Method 2
based on a fact that different substances have different dielectric constants, specially designed sensitive array sensors are adopted, and a distribution of a medium in a target field is constructed by using an appropriate image reconstruction algorithm and measuring voltages between sensitive electrodes
Implementation Method 3
when a working frequency of an excitation power supply is within a low frequency band, the excitation power supply meets requirements of an electrostatic field, and a fundamental equation of the electrostatic field is as follows: ∇·D=ρ where D represents an electric flux density, ε represents a dielectric constant, μ represents magnetic permeability and φ represents electric potential energy
Implementation Method 4
a fundamental equation of the electrostatic field is as follows: ∇·(ε·∇φ)=0
Data Source
AI summary
The present application belongs to the technical field of monitoring of durability of concrete, and particularly relates to a method for optimizing a structure of an electrical capacitance tomography sensor and analyzing an electromagnetic field. A specific process of the method includes eight steps: parameter setting, geometric setting, material setting, mesh generation, physical field setting, solution, sensor structure optimization and calculation of electromagnetic field distribution. The method proposes a new concept for solving a forward problem of an ECT system based on COMSOL software. After modeling is completed, uniformity of a sensitive field of the ECT sensor is analyzed according to calculation results, and structural parameter values of components of the ECT sensor are adjusted to seek an optimal design scheme.