ERT/ECT Dual-Modality 3D Sensor for Concrete Moisture Monitoring
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Solution Overview
Problem
Existing sensors for monitoring moisture transport in concrete structures are limited by complex construction, small dynamic monitoring range, inadaptability to concrete structures, inability to provide three-dimensional detection results, and lack of comparative verification methods in imaging results.
Innovation Solution
The development of an ERT/ECT dual-modality combined three-dimensional sensor with a simplified structure, wide dynamic monitoring range, and integrated design, capable of tracking moisture intrusion processes inside concrete structures and providing three-dimensional visual nondestructive monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nuclear magnetic resonance method or ray attenuation method is used for moisture monitoring, then spatial resolution is improved, but equipment complexity and cost increase
Solution Approach 1:
The patent combines ERT and ECT technologies into a dual-modality integrated sensor system. This merging allows the system to achieve high measurement precision through multiple imaging modes while avoiding the high equipment complexity and cost of nuclear magnetic resonance or ray attenuation methods, as both ERT and ECT use relatively simple electrical measurement principles
Solution Approach 2:
The integrated sensor serves multiple functions: it can perform both ERT imaging and ECT imaging, providing versatile moisture monitoring capabilities. This multi-functionality replaces the need for separate specialized equipment, reducing overall system complexity while maintaining high measurement precision through different imaging modes
2Measurement precision
If nuclear magnetic resonance method or ray attenuation method is used for moisture monitoring, then spatial resolution is improved, but measurement process complexity increases
Solution Approach 1:
By merging ERT and ECT into a single integrated sensor, the system achieves high spatial resolution through electrical imaging methods that provide fast response and simple measurement processes, avoiding the extremely tedious quantitative analysis and calculation required by nuclear magnetic resonance or ray attenuation methods
3Measurement precision
If ERT and ECT are combined into dual-modality system, then imaging accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges ERT and ECT electrode arrays into a single integrated sensor structure where ECT electrodes are arranged on the outer wall and ERT electrodes are arranged on the inner wall. This merging improves imaging accuracy through dual-modality measurement while the integrated design keeps the device structure relatively simple compared to separate systems
Solution Approach 2:
The sensor structure employs a nested arrangement where ERT electrodes are positioned inside the ECT electrode array. This nesting allows both electrode arrays to coexist in a compact configuration, achieving dual-modality imaging functionality without significantly increasing overall device complexity
4Adaptability or versatility
If traditional separate ERT and ECT systems are used, then measurement range is limited, but combining them widens measurement range
Solution Approach 1:
The patent merges ERT and ECT into a single integrated sensor that can measure both capacitance and resistance simultaneously. This combining widens the measurement range to cover both low moisture content (ECT-sensitive) and high moisture content (ERT-sensitive) conditions, while the integrated design manages system integration complexity through unified electrode arrangement and combined data acquisition
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 sensor achieves interactive, multi-dimensional, and visual quantitative detection of moisture intrusion processes, effectively solving the problem of dynamic three-dimensional imaging comparative analysis and overcoming the defects of conventional sensors in space imaging.
Implementation Method 1
the ERT is configured to measure the resistivity inside an object, the measurement field is equivalent to a resistance model, and electrodes are usually installed on the inner wall of the sensor to facilitate the injection of excitation current
Implementation Method 2
the ECT is configured to measure the dielectric constant inside an object, the measurement field is equivalent to a capacitance model
Implementation Method 3
the ERT and the ECT are both based on the electromagnetic field theory, and the images of the changes of the moisture distribution inside the concrete over time is reconstructed by acquiring the changes of electrical signals in the measurement field by the sensors in real-time
Data Source
AI summary
The present disclosure relates to an ERT/ECT dual-modality combined three-dimensional sensor. A cover box is sheathed with a shielding box, a plurality of small round holes are formed in the top surface and the side surfaces of the cover box, ERT electrodes are arranged in the small round holes, and ECT electrodes are arranged at the outer sides of the ERT electrodes. The ERT electrodes are connected to an ERT data acquisition box via electrode leads, and the ECT electrodes are connected to an ECT data acquisition box via the electrode leads. An integrated cuboid design in line with the concrete structure is employed. Meanwhile, the dimensions, combination modes, placement modes and positions, supporting structures, shielding devices, electrode leads and leading-out modes of two sets of electrode arrays are subjected to comprehensive optimization design to achieve three-dimensional visual nondestructive monitoring of the moisture intrusion process in the concrete structure.