Visual Stethoscope for Crack and Scar Distinction
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Solution Overview
Problem
Current methods for distinguishing cracks in metal workpieces from scars caused by forging or external impact are environmentally harmful, ineffective for detecting inner surfaces, and require chemical solvents, making them unsafe and inefficient.
Innovation Solution
An industrial visual stethoscope system comprising a base, workpiece support, single-color lighting device, camera module, rotating device, and analyzing device, which uses single-color lighting and camera imaging to differentiate cracks and scars based on specular reflection, allowing for safe and environmentally friendly detection of both outer and inner surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent powder method is used to detect cracks, then crack detection capability is improved, but environmental pollution and human health hazards occur
Solution Approach 1:
The patent replaces the chemical-based fluorescent powder method with an optical-based imaging system. A camera captures images of the workpiece surface under controlled lighting conditions, and image processing algorithms automatically identify cracks. This substitution eliminates the need for fluorescent powders, water rinsing, and chemical handling, thereby resolving the environmental pollution and health hazard issues while maintaining crack detection capability.
Solution Approach 2:
The patent introduces an image processing system as an intermediary between the workpiece and the detection result. Instead of directly observing fluorescent powder accumulation, the system uses cameras to capture optical images and employs algorithms to analyze surface features, identify crack patterns, and generate detection results. This intermediary approach enables non-contact, chemical-free detection that is both environmentally friendly and highly accurate.
2Measurement precision
If fluorescent powder method is used, then outer surface crack detection is improved, but inner wall detection capability is lost
Solution Approach 1:
The patent designs an imaging-based detection system that can detect cracks on both outer surfaces and inner walls of workpieces. By using cameras and controlled lighting that can be positioned on either side of the workpiece, the system achieves universal applicability. The same optical imaging and image processing methodology works for both external and internal surfaces, eliminating the limitation of the fluorescent powder method which cannot access inner walls.
3Measurement precision
If manual crack inspection is performed, then detection accuracy is improved, but productivity and efficiency deteriorate
Solution Approach 1:
The patent implements an automated detection system where the imaging equipment and image processing algorithms perform the inspection task independently without human intervention. The system automatically captures images, processes them through crack detection algorithms, identifies defects, and generates results. This self-service capability maintains high detection accuracy through consistent algorithmic analysis while dramatically improving productivity by eliminating manual inspection bottlenecks and enabling rapid processing of multiple workpieces.
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 effectively distinguishes cracks from scars without harming the environment or human health, enabling automatic and efficient detection of defects on both outer and inner surfaces of metal workpieces, reducing manpower costs and improving detection efficiency.
Implementation Method 1
the single-color lighting device irradiates the workpiece with a single-color light
Implementation Method 2
distinguish a recess that is overexposed in the film due to specular reflection on the workpiece
Data Source
AI summary
An industrial visual stethoscope system and a detecting method are provided. The system has a base, a workpiece support, a single-color lighting device, a camera module, a rotating device, and an analyzing device. When the single-color light irradiates the workpiece, if the single-color light irradiates into the crack which is relatively deep and narrow, the single-color light is rarely to be reflected out of the crack. But if the single-color light irradiates into the scar, the single-color light is reflected out of the scar due to the specular reflection. During the relative rotation, when the reflected light enters the camera module in parallel, the energy of the light is concentrated, causing overexposure and forming obvious white light. Thus, the analyzing device can identify the recess is a scar formed by hit rather than a crack formed by heat.