LIBS Fractal Scanning for Artifact-Free Composition Maps
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Solution Overview
Problem
Conventional laser-induced breakdown spectroscopy (LIBS) scanning methods suffer from artifacts such as blurring and smearing in positionally-resolved images due to material transport effects, leading to inaccurate composition measurements.
Innovation Solution
Employing a fractal path for moving the ablation point sequentially along a fractal pattern, which reduces material transport and minimizes artifacts by distributing scan movements in multiple directions, using fractal patterns like Hilbert, Moore, or Peano curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional scanning methods are used to move the ablation point across the sample surface, then the scanning process is simple and fast, but material transport effects cause blurring and smearing artifacts in positionally-resolved images
Solution Approach 1:
The scanning path is divided into multiple fractal segments (e.g., Hilbert curve, Peano curve, Moore curve) that collectively cover the sample surface. Each segment is designed to minimize material transport in specific directions, and the combination of segments achieves comprehensive coverage while eliminating blurring artifacts.
Solution Approach 2:
The scanning approach transitions from conventional linear or raster paths to fractal curves that fill two-dimensional space efficiently. These space-filling curves distribute scanning movements in multiple directions across the surface, converting a simple one-dimensional scanning motion into a complex multi-directional path that eliminates material transport artifacts.
2Reliability
If the ablation point moves in a single direction or simple pattern, then the scanning mechanism is simple, but material transport causes smearing artifacts in the compositional maps
Solution Approach 1:
The scanning system dynamically adjusts the ablation point trajectory following fractal curves rather than static linear paths. The positioning system (galvanometer mirrors or piezoelectric actuators) is controlled to trace complex fractal patterns, dynamically changing direction at each segment to minimize material transport effects while maintaining precise positional control.
Solution Approach 2:
The patent replaces simple mechanical scanning with optically-controlled beam positioning using galvanometer mirrors or piezoelectric actuators. This substitution allows precise control of the ablation point along fractal paths without complex mechanical moving parts, achieving reliable compositional mapping through optical-mechanical integration.
3Manufacturing precision
If conventional raster or linear scanning is used, then the scanning process is straightforward and fast, but positionally-resolved images exhibit blurring artifacts
Solution Approach 1:
The fractal scanning path is implemented as a periodic sequence of directional changes along the curve. The ablation point periodically reverses direction at fractal segments, creating a systematic pattern of multi-directional scanning that eliminates material transport artifacts while maintaining continuous scanning operation.
Solution Approach 2:
The scanning approach combines multiple fractal curve segments (e.g., Hilbert + Peano, or multiple Moore curves) to create a composite scanning path. This composite fractal path integrates the advantages of different fractal geometries to achieve comprehensive surface coverage with minimized material transport effects in all directions.
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
This approach provides accurate, artifact-free positionally-resolved maps and averaged compositions, enhancing the precision of elemental analysis in LIBS by minimizing errors and blurring.
Implementation Method 1
LIBS relies on pulsed energy emissions, such as pulsed laser emission, directed toward the sample to ablate, atomize, and ionize matter
Implementation Method 2
The impact of each laser pulse onto the sample's surface creates a plume of plasma
Implementation Method 3
the plasma causes atomic emission during the cooling process
Implementation Method 4
The different energy levels of different atoms produce different photon energies for each kind of atom, with narrowband emissions due to their quantization. These emissions correspond to the spectral emission lines found in LIBS spectra
Data Source
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AI summary
A method for compositional analysis includes providing a sample having a surface, moving an ablation point to a plurality of positions on the surface along a fractal path, pulsing an energy source to provide an electromagnetic energy beam to ablate material at the ablation point, collecting an emission spectrum in response to pulsing the energy source, and analyzing the emission spectrum to determine a composition at the surface.