Fractal-Path Laser-Induced Breakdown Spectroscopy for Artifact Reduction
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Solution Overview
Problem
Conventional scanning methods in laser-induced breakdown spectroscopy (LIBS) result in artifacts such as blurring or smearing in positionally-resolved images due to material transport effects, leading to inaccurate composition measurements.
Innovation Solution
Employing a fractal path for the movement of the ablation point on the sample surface, derived from fractal patterns like Hilbert or Moore patterns, to minimize material transport and reduce artifacts, using a system with a controller to guide the laser and spectrometer for accurate emission spectrum collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional scanning methods are used for laser-induced breakdown spectroscopy, then the analysis can be performed with standard scanning patterns, but artifacts such as blurring or smearing appear in positionally-resolved images due to material transport effects
Solution Approach 1:
The patent applies dynamic scanning patterns (fractal paths such as Hilbert or Moore curves) that continuously change the laser beam's trajectory across the sample surface. This dynamic approach distributes material transport effects more uniformly throughout the analysis area rather than concentrating them in fixed scan directions, thereby reducing visible artifacts in positionally-resolved images while maintaining measurement accuracy
2Productivity
If the ablation point moves along conventional scan paths, then the scanning process is simple and fast, but material transport effects cause blurring or smearing in the compositional maps
Solution Approach 1:
The system implements dynamic fractal scanning patterns that optimize the laser beam trajectory to minimize material transport artifacts. These patterns maintain high scanning speeds by using continuous, space-filling curves while distributing ablation points in a manner that reduces directional material flow, thereby preserving both productivity and compositional mapping accuracy
Solution Approach 2:
The patent changes the scanning parameter from conventional linear or raster patterns to fractal-based paths. This parameter change in the scanning trajectory fundamentally alters how material is transported and deposited during analysis, reducing artifacts in compositional maps while maintaining efficient scanning speeds through the space-filling properties of fractal curves
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 use of fractal paths significantly reduces errors and artifacts in compositional maps, enabling high-accuracy, positionally-resolved analysis with minimized galvo and linear stage movements.
Implementation Method 1
pulsing an energy source to provide an electromagnetic energy beam to ablate material at the ablation point
Implementation Method 2
The ablated material evolves an emission spectrum
Implementation Method 3
The impact of each laser pulse onto the sample's surface creates a plume of plasma, light from which can be analyzed to perform qualitative and quantitative spectroscopy measurements
Data Source
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.