Distributed Electromagnetic Sensing for Internal Concrete Dam Cracks
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Solution Overview
Problem
Existing methods for monitoring active cracks in concrete dams are costly, labor-intensive, and ineffective in detecting internal defects, with limitations such as high noise interference, material heterogeneity, and limited applicability of existing technologies like infrared, acoustic emission, and ultrasonic methods.
Innovation Solution
A system and method utilizing electromagnetic signal acquisition devices with sensors, amplifiers, filters, and a central processing unit to collect, process, and analyze electromagnetic radiation signals from active cracks, enabling real-time monitoring and quantification of crack locations and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic signal acquisition devices are deployed to monitor active cracks in concrete dams, then measurement precision and reliability are improved, but device complexity and cost increase
Solution Approach 1:
The monitoring system is divided into multiple independent electromagnetic signal acquisition devices, each equipped with sensors, amplifiers, and filters. These distributed devices can be strategically placed at different locations on the dam structure, allowing the system to cover large areas while maintaining modular complexity and facilitating easier deployment and maintenance of individual units.
Solution Approach 2:
The patent introduces electromagnetic radiation signals as an intermediary carrier to detect crack activity. Instead of directly measuring mechanical properties or using complex contact-based sensors, the system uses electromagnetic signals generated by active cracks as a mediator to convey information about crack status, simplifying the detection mechanism while improving measurement precision.
2Measurement precision
If traditional monitoring methods like infrared or ultrasonic techniques are used, then device complexity is reduced, but measurement precision and ability to detect internal defects deteriorates
Solution Approach 1:
The patent replaces traditional mechanical or thermal detection methods (ultrasonic, infrared) with electromagnetic field-based detection. By using electromagnetic radiation signals that naturally emanate from active cracks, the system achieves superior penetration and detection capability for internal defects without requiring complex coupling media or thermal sources, thereby improving measurement precision while managing device complexity.
3Reliability
If electromagnetic signal acquisition devices are deployed throughout the dam, then monitoring coverage and reliability are improved, but power consumption and operational cost increase
Solution Approach 1:
The electromagnetic signal acquisition devices operate by periodically detecting and analyzing electromagnetic radiation signals from active cracks rather than continuous monitoring. The system can be configured to sample at optimized intervals, reducing power consumption while maintaining reliable detection capability. The devices remain in low-power states between measurement cycles and activate only when signals are detected or according to predetermined schedules.
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 system provides efficient, real-time monitoring of active cracks within concrete dams with improved accuracy and reliability, overcoming environmental noise and material limitations, and reducing power consumption.
Implementation Method 1
collecting and extracting electromagnetic radiation signals generated by the active cracks in the concrete dam
Implementation Method 2
in response to filtering interference data caused by spatial electromagnetic radiation noises out of the three-axis magnetic field components, obtaining by an amplifier filter circuit and a data acquisition processor, electromagnetic radiation signals generated by the active cracks
Data Source
AI summary
The disclosure provides a system for electromagnetic monitoring of active cracks in a concrete dam. The system includes at least four electromagnetic signal acquisition devices and a main control module. Each electromagnetic signal acquisition device includes: an electromagnetic monitoring sensor, an electromagnetic signal acquisition module, a power supply module and a first wireless communication module, for collecting and extracting electromagnetic radiation signals generated by the active cracks in the concrete dam. The main control module includes: a second wireless communication module, a CPU, a data storage unit and a data display unit, for processing the electromagnetic radiation signals received by the second wireless communication module, positioning locations of the active cracks and quantifying sizes of the active cracks.