Rock Specimen Crack Detection With Acoustic-Optical Sensing
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Solution Overview
Problem
Existing nondestructive testing methods like SEM and CT scanning have limitations in detecting crack initiation and propagation in larger rock specimens, requiring high energy and resolution, and fail to capture internal crack evolution.
Innovation Solution
A fine detection device and method using an organic glass skeleton, sensor support skeletons, electrical and sound emission signal acquisition systems, and distributed optical fiber sound wave acquisition, coupled with a computer, to monitor electrical parameters, sound emissions, and optical fiber vibrations for real-time crack detection during loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SEM or CT scanning is used to detect crack evolution in rock specimens, then measurement precision is improved, but the specimen size is limited to less than 50 mm and energy consumption increases
Solution Approach 1:
The patent replaces traditional mechanical/optical imaging systems (SEM, CT) with an acoustic field-based detection system. Acoustic sensors detect crack signals through sound wave propagation in the rock specimen, eliminating the need for high-energy imaging equipment while enabling detection of larger specimens. This substitution of detection mechanism resolves the contradiction between measurement precision and energy consumption.
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium to detect crack evolution. Instead of directly imaging the rock specimen with high-energy beams, acoustic waves serve as a mediator that propagates through the specimen, interacts with cracks, and carries information to sensors. This intermediary approach enables detection with lower energy consumption while maintaining precision for larger specimens.
2Measurement precision
If CT scanning with high energy and resolution is used for larger specimens, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex high-energy CT scanning equipment with a simpler acoustic detection system. The testing apparatus uses standard loading equipment combined with acoustic sensors, eliminating the need for sophisticated CT machines. This substitution dramatically reduces device complexity and cost while maintaining the capability to detect cracks in larger specimens with adequate precision.
3Measurement precision
If multiple detection systems are used to monitor crack evolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple detection functions into a single integrated acoustic detection system. Instead of using separate SEM, CT, and other imaging systems, the invention combines crack detection, propagation monitoring, and spatial localization into one acoustic-based system. This merging reduces device complexity while maintaining comprehensive monitoring precision through the unified acoustic field approach.
Solution Approach 2:
The acoustic detection system performs multiple functions simultaneously: detecting crack initiation, monitoring propagation, localizing crack positions, and evaluating damage evolution. This multi-functionality eliminates the need for multiple specialized detection systems, reducing overall device complexity while maintaining high measurement precision across all monitoring aspects.
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 dynamic, wide-range, and efficient crack initiation and propagation monitoring in rock specimens, evaluating damage evolution and predicting crack behavior in complex environments, with reusable components for rock mass engineering.
Implementation Method 1
These changes lead to changes in the physical field of the rock specimen, such as resistivity, wave velocity and the like
Implementation Method 2
Meanwhile, sound waves can be excited at the fracture position. If these changing physical fields and even sound waves can be caught, the crack initiation and propagation of the rock specimen can be obtained
Implementation Method 3
the distributed optical fiber sound wave acquisition system is used for determining the intensity of vibration and the three-dimensional spatial position
Data Source
AI summary
The present disclosure provides a fine detection device and method for crack initiation and propagation of a rock specimen during loading process. The device comprises an organic glass skeleton, a plurality of sensor support skeletons, a multi-parameter dynamic acquisition system, a servo press bearing platform and a computer, wherein the organic glass skeleton is placed in the middle of the servo press bearing platform, the sensor support skeletons are arranged inside the organic glass skeleton, the rock specimen is arranged inside the sensor support skeleton, the multi-parameter dynamic acquisition system is fixedly arranged on the sensor support skeleton, the multi-parameter dynamic acquisition system is in contact with the rock specimen, and the multi-parameter dynamic acquisition system and the servo press bearing platform are electrically connected to the computer.