Specular Reflection Imaging for Transparent Material Sorting
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Solution Overview
Problem
Existing imaging systems for automatic material sorting struggle with inspecting transparent and poorly diffusing materials due to reliance on diffused light, which can be unreliable and prone to noise, especially when the conveying surface changes or is dirty, leading to saturation issues and inaccurate characterization.
Innovation Solution
An apparatus and method utilizing concentrated diffused lighting to generate a specular reflected light beam, which is imaged and analyzed to provide reliable characterization data for transparent and light materials, independent of the conveying surface, allowing for effective sorting and classification in industrial processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diffused light is used to characterize transparent materials, then the measurement signal can be obtained, but the signal is too small and lost in noise
Solution Approach 1:
The patent converts the harmful specular reflection into a beneficial signal source. By positioning the imaging unit to receive specularly reflected light from the light source, the system transforms what was previously considered a parasitic effect into the primary measurement signal, thereby obtaining sufficient signal strength without relying on weak diffused light that is lost in noise.
2Object-affected harmful factors
If specular reflections are minimized to avoid saturation, then saturation issues are reduced, but the measured signal becomes too small to provide accurate information
Solution Approach 1:
Instead of trying to minimize or eliminate specular reflections as in prior art, the patent inverts the approach by deliberately utilizing specular reflections as the primary measurement signal. The imaging unit is specifically positioned to receive the specularly reflected light, turning the conventional wisdom on its head and achieving both sufficient signal strength and accurate material characterization.
3Adaptability or versatility
If diffused light from the conveying belt is used, then transparent materials can be inspected, but the inspection becomes unreliable when belt conditions change
Solution Approach 1:
The patent extracts the measurement signal directly from the specular reflection off the inspected material itself, eliminating dependence on the conveying belt's surface properties. By using the light source and imaging unit positioned to capture specular reflections, the system removes the belt condition variability from the measurement equation, ensuring reliable and consistent inspection results regardless of belt state.
4Object-affected harmful factors
If high dynamic range imaging is used to reduce saturation, then maximum detection of diffused light is enabled, but saturation issues may still arise and device complexity increases
Solution Approach 1:
Rather than using high dynamic range imaging to cope with saturation from specular reflections, the patent inverts the approach by positioning the imaging unit to receive specular reflections at an angle that optimizes signal strength while avoiding saturation. This geometric solution is simpler than implementing high dynamic range imaging systems and achieves the same goal of preventing saturation while maintaining signal strength.
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 reliable inspection and sorting of transparent and light materials without relying on a conveying surface, reducing noise and saturation issues, and simplifying implementation and maintenance, making it suitable for online industrial processes.
Implementation Method 1
a lighting unit for projecting a concentrated diffused lighting onto at least a portion of the matter to generate a specular reflected light beam representative of the inspected matter
Implementation Method 2
an imaging unit mounted according to a given imaging angle with respect to the projected concentrated diffused lighting for imaging at least a portion of the specular reflected light beam to provide image data representative of the inspected matter
Data Source
AI summary
An apparatus and a method for inspecting matter and the use thereof for sorting recyclable material including transparent material are disclosed. The apparatus comprises a lighting unit for projecting a concentrated diffused lighting onto the matter to generate a specular reflected light beam representative of the inspected matter. The apparatus comprises an imaging unit mounted according to a given imaging angle with respect to the projected concentrated diffused lighting for imaging the specular reflected light beam to provide image data representative of the inspected matter. The apparatus comprises an analyzing unit for analyzing the image data and providing matter characterization data based on the specular reflected light beam representative of the inspected matter.