Transparent Slab Defect Detection via Collimated Light Diffusion
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Solution Overview
Problem
Existing methods for identifying defects in transparent slabs often result in high false positives due to foreign bodies, leading to increased verification time and costs, and require a washing and drying phase to mitigate these issues, which is resource-intensive and costly.
Innovation Solution
A method and system that utilize a combination of emission and lighting phases to differentiate between defects and foreign bodies by emitting collimated light radiation through the slab, which is diffused by defects, allowing for precise identification without pre-washing, using a system with acquisition, emission, and lighting phases to capture images of the slab from different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a washing phase is introduced to eliminate foreign bodies, then false positives are reduced, but execution time and resource consumption increase
Solution Approach 1:
The patent extracts and removes foreign bodies from the slab surface using a blowing device that directs compressed air onto the slab, eliminating the need for water washing and drying phases while maintaining defect identification accuracy
Solution Approach 2:
The patent replaces the mechanical washing system (water spray, drying equipment) with a pneumatic system (compressed air blowing device) that achieves the same cleaning purpose without the associated time and resource costs
2Reliability
If a washing phase is introduced to eliminate foreign bodies, then false positives are reduced, but resource consumption increases
Solution Approach 1:
The patent extracts and removes foreign bodies from the slab surface using a blowing device that directs compressed air onto the slab, eliminating the need for water washing and drying phases while maintaining defect identification accuracy
Solution Approach 2:
The patent uses compressed air (pneumatic system) to blow foreign bodies off the slab surface, replacing the hydraulic washing system and eliminating water and detergent consumption
3Productivity
If conventional image acquisition is used, then foreign bodies are detected as defects, but this increases false positives
Solution Approach 1:
The patent introduces collimated light as an intermediary that passes through the transparent slab, allowing defects to be highlighted through light diffusion while foreign bodies on the surface do not affect the transmitted light pattern
Solution Approach 2:
The patent changes the illumination parameter from conventional surface lighting to transmitted collimated light, exploiting the transparency of the slab to differentiate between surface foreign bodies and internal defects
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
Significantly reduces the risk of false positives and execution time by accurately identifying defects without the need for pre-washing, while maintaining efficiency and reducing resource consumption.
Implementation Method 1
emission of at least one light radiation 4 transmitted inside the slab 2 along an emission line B substantially transverse to the acquisition line A and adapted to be incident with at least one defect 3 of the slab 2 so as to identify the position thereof
Data Source
AI summary
A method (and system) for the identification of defects in transparent slabs comprises at least the phases of supply of at least one transparent slab to be inspected; acquisition of at least one image of at least one portion of the slab along an acquisition line; identification of at least one defect in the slab depending on the acquired image; at least one emission phase of at least one light radiation transmitted inside the slab along an emission line substantially transverse to the acquisition line and adapted to be incident with at least one defect in the slab in order to identify the position thereof, the light radiation incident with the defect being diffused by the latter at least in part outside the slab.