Spectral Sorting via Air Suspension for Material Identification
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Solution Overview
Problem
Existing optical spectral analysis systems for material identification and sorting face challenges in measurement precision, process speed, and control of particle speed and orientation, particularly in high-volume processing of materials like plastics and ceramics.
Innovation Solution
A spectral identification and sorting system utilizing a conveying roller with an illumination unit and spectral detection unit to analyze and sort materials based on their infrared spectral signatures, featuring a rotatable conveying roller, an illumination unit that emits light in specific wavebands, and a processing unit for material identification, with optional air jets for sorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If particles are conveyed on a belt conveyor for spectral analysis, then high volume processing is achieved, but measurement precision deteriorates due to particle speed and orientation control issues
Solution Approach 1:
The patent replaces the mechanical belt conveyor system with a pneumatic suspension system that uses air flow to levitate and convey particles. This substitution eliminates mechanical contact and friction, allowing particles to be held in a stable position within the air stream while being conveyed, thereby improving spectral measurement precision while maintaining high processing volumes
Solution Approach 2:
The patent introduces an air stream as an intermediary medium to convey particles through the measurement zone. The air flow acts as a carrier that suspends particles without mechanical contact, enabling precise spectral analysis while maintaining continuous high-volume processing capability
2Measurement precision
If particles are analyzed as freefalling from a particle feeder, then measurement precision is improved, but process speed deteriorates
Solution Approach 1:
The patent implements a continuous air stream that constantly carries particles through the measurement zone, eliminating the intermittent nature of freefall systems. Particles are continuously supplied, suspended, and conveyed through the spectral analysis region, maintaining both high measurement precision and fast process speed through uninterrupted operation
3Device complexity
If particle speed and orientation are not controlled, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent utilizes the natural properties of particles in an air stream, where particles self-adjust their orientation and position based on aerodynamic forces. The system leverages the inherent behavior of particles suspended in air flow, eliminating the need for complex active control mechanisms while maintaining measurement precision through the stable, reproducible nature of aerodynamic suspension
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 achieves precise and efficient material identification and sorting by stabilizing objects on a conveying surface, controlling their speed and orientation, and using infrared spectroscopy to differentiate materials, thereby improving processing speed and accuracy.
Implementation Method 1
an illumination unit configured to project illumination light toward an illumination zone intersecting at least part of the conveying path to illuminate the flow of objects on the conveying surface
Implementation Method 2
a spectral detection unit configured to detect object light emanating from the flow of objects in the illumination zone upon illumination by the illumination light and output spectral data representative of the detected object light
Data Source
AI summary
Spectral identification and optical sorting systems and methods are disclosed. The system can include a conveying roller having a conveying surface on its outer lateral periphery along which a flow of objects can be transported; an illumination unit to illuminate the objects on the conveying surface; a spectral detector to detect object light from the objects and output spectral data; and a processor to derive, from the measured spectral data, material-specific information associated with the objects. A sorting unit can be provided to sort the objects based on the material-specific information. An infrared emitter-detector assembly for measuring a mid-wavelength infrared (MWIR) response of an object is also disclosed and includes an illumination unit having a blackbody-like source operated at a temperature of about at least 2000 kelvins; and a MWIR detector having a detection waveband including wavelengths between about 2.5 and 8 micrometers to detect object light from the object.