Concrete Crack Visualization Using Fluorescent UV Imaging
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Solution Overview
Problem
Existing methods for tracking crack initiation and propagation in concrete components, such as AE, DIC, ultrasonic excitation infrared thermal imaging, and fluorescence excitation, face challenges in real-time visualization, especially for multiple cracks, due to interference, small observation areas, and short fluorescence duration.
Innovation Solution
A rapid real-time visualization system using a pressure test machine, fluorescent solution spraying device, UV lamp group, and visible light imaging device, controlled by a computer system, to apply fluorescent solution, UV light, and record crack development, allowing real-time monitoring of crack initiation and propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AE technology is used to locate and identify crack initiation points, then crack positioning capability is improved, but real-time visual tracking of entire crack process is lost
Solution Approach 1:
The patent introduces fluorescent solution as an intermediary substance that adheres to crack surfaces and fluoresces under UV light, enabling visual tracking of cracks while maintaining the positioning capability of AE technology. The fluorescent solution acts as a mediator between the crack structure and the detection system, allowing simultaneous acquisition of both precise location and visual process information.
Solution Approach 2:
The patent utilizes fluorescence color change phenomenon where cracks appear as bright fluorescent lines under UV illumination. This color/brightness change provides visual contrast that enables real-time tracking of crack initiation and propagation processes, complementing the precise positioning data from AE technology.
2Measurement precision
If DIC technology is used to obtain full-field displacement information, then displacement measurement capability is improved, but observation area is limited due to spraying complexity
Solution Approach 1:
The fluorescent solution serves multiple functions: it acts as a speckle pattern for DIC displacement measurement, simultaneously serves as a visual tracer for crack detection, and provides UV-reflective properties for enhanced imaging. This multi-functionality eliminates the need for separate observation area limitations and enables full-component monitoring.
3Measurement precision
If fluorescence excitation technology is used to detect existing cracks, then microcrack detection capability is improved, but real-time tracking is lost due to short fluorescence duration
Solution Approach 1:
The patent applies fluorescent solution to the concrete surface before loading, allowing the solution to penetrate and adhere to potential crack paths in advance. This preliminary action ensures that when cracks form during loading, the fluorescent material is already in position to highlight them, enabling continuous real-time tracking throughout the entire crack development process rather than only detecting existing cracks.
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 real-time visualization of crack initiation and propagation, identifying cracks as narrow as 0.017 mm, with synchronized fluorescent solution adhesion and UV imaging, facilitating comprehensive crack pattern analysis.
Implementation Method 1
The fluorescence excitation technology utilizes the unique capillary adsorption effect to cracks, especially microcracks, to induce fluorescence solution on the surface of an excited object to migrate into a crack cavity.
Implementation Method 2
The UV lamp group is configured to project UV lights onto the observation surface of the concrete component
Data Source
AI summary
A rapid real-time visualization system for a crack initiation process of a concrete component includes a pressure test machine, a fluorescent solution spraying device, an ultraviolet lamp group, a visible light imaging device group and a computer control system. Before the concrete component cracks, a surface of the concrete component is coated with a fluorescent solution retention layer to separate the sprayed fluorescent excitation solution from the concrete component, making the fluorescent excitation solution adhere to the fluorescent solution retention layer for a long time to mark cracks at any position in real time. The rapid real-time visualization system is used to achieve visualization of the crack initiation process, especially an early stage thereof. The rapid real-time visualization system and method can be used to study patterns of microcrack mutual traction development and aggregation into groups when concrete materials crack at any position or multiple points at a component scale.