LIBS Spectroscopy V-Chute Gravity Alignment
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Solution Overview
Problem
Existing LIBS measurement systems are bulky and limited in field applicability due to the need for complex scanning and autofocus systems when analyzing materials on a conveyor belt, leading to inefficiencies and reduced reliability.
Innovation Solution
A LIBS system that uses a V-shaped chute to align material pieces with a fixed laser beam, eliminating the need for scanning and autofocus by constraining pieces with gravity, allowing for rapid and accurate spectral analysis through a hole in the chute, and sorting using an air nozzle or diverter system based on composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex scanning and autofocus systems are used to analyze materials on a conveyor belt, then measurement precision is improved, but device complexity increases and reliability decreases
Solution Approach 1:
The system segments the material flow by using a V-shaped chute to individualize each piece's path, allowing a fixed laser beam to analyze each piece sequentially as it passes through the analysis zone. This eliminates the need for complex scanning mechanisms while maintaining the ability to analyze multiple pieces.
Solution Approach 2:
The V-shaped chute utilizes gravity to automatically position and align each material piece with the fixed laser beam and detection optics. The pieces self-align as they slide down the chute, eliminating the need for active autofocus or positioning systems.
2Productivity
If complex scanning systems are used to track material pieces, then every piece can be sampled, but device complexity increases and reliability decreases
Solution Approach 1:
Instead of moving the laser beam to track material pieces (active scanning), the system inverts the approach by keeping the laser fixed and allowing the material to move through the analysis zone. The V-shaped chute guides each piece to pass through the stationary laser beam and detection optics.
Solution Approach 2:
The system replaces complex mechanical scanning systems with a gravity-based V-shaped chute that passively guides material pieces through the analysis zone. This mechanical simplification maintains throughput while eliminating complex scanning mechanisms.
3Measurement precision
If autofocus systems are used to maintain focus on moving material, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The V-shaped chute creates a controlled gravitational field that ensures all material pieces pass through the analysis zone at optimal positioning. By designing the chute geometry to naturally guide pieces through the focal zone, the system eliminates the need for active autofocus mechanisms while maintaining measurement precision.
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 provides rapid, accurate, and reliable material analysis and sorting without the need for complex scanning or autofocus, improving industrial viability by ensuring every piece is sampled and reducing segregation and uncertainty, while maintaining a moderate depth of field.
Implementation Method 1
laser-induced breakdown spectroscopy (LIBS), which involves focusing a laser beam onto a surface of the sample with a high enough power density to transform a small part of the sample material into a state of plasma
Implementation Method 2
Optical emissions from the plasma plume are collected with light collection optics, and the spectral distribution (i.e. intensity as a function of wavelength) of the collected optical emissions is analyzed
Implementation Method 3
A LIBS system that uses a V-shaped chute to align material pieces with a fixed laser beam, eliminating the need for scanning and autofocus by constraining pieces with gravity
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A LIBS measurement system is described herein that provides an orifice, aperture or opening in a substantially V-shaped chute or sleeve that allows access to the material to be analyzed from the underside of the chute. The laser beam is aimed through the hole and return light (signal) is collected through the hole by a photodetector assembly. A diverter device, which is located at an output end of the chute, diverts certain particles away from the chute upon receipt of an actuation signal.