Arc Path LIBS Scanning to Prevent Image Smearing
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Solution Overview
Problem
Conventional laser-induced breakdown spectroscopy (LIBS) scanning methods result in artifacts such as blurring or smearing in positionally-resolved images due to material transport effects when scanning in a single direction, leading to inaccurate composition measurements.
Innovation Solution
The use of an arc path defined by a plurality of arcs with a common center point or foci, where each arc is concave in the scanning direction, reduces material transport artifacts by moving the ablation point along arcs with alternating angular directions, allowing for accurate emission spectrum collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional linear scanning methods are used, then the scanning process is simple and fast, but material transport artifacts such as blurring or smearing occur in positionally-resolved images
Solution Approach 1:
The patent applies curved arc paths instead of linear scanning trajectories. The ablation point moves along arcs defined by multiple arcs with a common center point or foci, where each arc is concave in the scanning direction. This curvature prevents material ejected during ablation from being reanalyzed by subsequent laser pulses, thereby eliminating blurring artifacts while maintaining scanning efficiency
Solution Approach 2:
The scanning path is divided into multiple discrete arcs rather than using a single continuous linear path. Each arc is independently defined and can be optimized for specific regions of the sample. This segmentation allows the system to achieve comprehensive coverage while minimizing material transport effects in different areas
2Measurement precision
If single-direction scanning is used, then the scanning mechanism is simple, but material transport effects cause blurring artifacts
Solution Approach 1:
The scanning system alternates between different arc directions, with adjacent arcs scanned in opposite angular directions. This periodic reversal of scanning direction prevents systematic material transport artifacts and ensures that ejected material does not consistently affect subsequent measurement points, thereby improving composition measurement accuracy
3Productivity
If linear scanning paths are used, then material analysis is efficient, but mechanical stress on scanning components increases
Solution Approach 1:
The arc-based scanning path distributes mechanical stress more evenly across the scanning components compared to sharp linear transitions. The continuous curvature of the arc paths eliminates abrupt direction changes, reducing peak mechanical stresses on galvanometer mirrors or other scanning actuators while maintaining high scanning speeds and productivity
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 arc path scanning method minimizes blurring artifacts, providing accurate and precise compositional analysis by limiting material reanalysis and reducing mechanical stress on scanning components.
Implementation Method 1
pulsing an energy source to provide an electromagnetic energy beam to ablate material at the ablation point
Implementation Method 2
the plasma causes atomic emission during the cooling process
Data Source
Figure 1
Figure 2
Figure 3~7
AI summary
A method for compositional analysis, in particular laser-induced breakdown spectroscopy (LIBS), includes providing a sample having a surface, moving an ablation point to a plurality of positions on the surface along an arc path defined by a plurality of arcs, wherein the plurality of arcs extend from an edge of the area to another edge of the area, wherein the arc path follows adjacent arcs of the plurality of arcs, 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.