In-Chamber Fiber Optic LIBS Detection for Stable Plasma Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laser ablation systems face challenges in detecting certain chemical species due to atmospheric gases and high ionization potential elements, which cause interference and poor sensitivity in inductively-coupled plasma systems, and require complex external optic systems that are prone to fouling and misalignment.
Innovation Solution
The system employs fiber optics positioned directly within the laser ablation chamber to collect light emitted from plasma without intervening focusing optics, using a cup to support the fibers adjacent to the target, ensuring direct light collection and transmission to spectrometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external optic systems are used to collect light from plasma, then light collection is possible, but the system becomes complex and prone to fouling and misalignment
Solution Approach 1:
The patent extracts the light collection function from the complex external optic system and implements it directly through fiber optic cables positioned within the ablation chamber. This eliminates the need for separate lenses, mirrors, and focusing optics, thereby reducing system complexity while maintaining reliable light collection for spectral analysis
Solution Approach 2:
The patent uses fiber optic cables as intermediaries to transmit light directly from the plasma source to the spectrometer. These fibers serve as the sole optical interface, eliminating the need for complex external optic systems and reducing susceptibility to fouling and misalignment while maintaining detection reliability
2Measurement precision
If fiber optics are positioned within the ablation chamber, then light collection efficiency improves, but the risk of fiber damage from plasma increases
Solution Approach 1:
The patent positions the fiber optic cables within the ablation chamber before plasma generation occurs. The fibers are strategically placed to collect light from the plasma while maintaining adequate spacing to avoid direct exposure to the most intense plasma conditions, thereby preserving measurement precision while preventing fiber damage
Solution Approach 2:
The patent implements spatial differentiation in the ablation chamber by positioning fiber optic cables in regions of optimal light collection while avoiding the most intense plasma zones. This local positioning strategy enables high signal quality without exposing the fibers to damaging plasma conditions
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 enhances signal quality and sensitivity by eliminating errors from external optics, providing stable and reproducible analysis of chemical species without interference.
Implementation Method 1
ablating a portion of the target with one or more laser pulses to generate a plume containing particles and/or vapor ejected or otherwise generated from the target
Implementation Method 2
generate a plasma upon ablation
Implementation Method 3
receive light emitted from the plasma generation
Data Source
AI summary
Systems and methods for laser induced breakdown spectroscopy using one or more fiber optics within a laser ablation chamber are described. A system embodiment includes, but is not limited to, an ablation chamber defining an interior region configured to hold a sample target for ablation by an ablation beam source to generate a plasma upon ablation; and at least one optical fiber having an end positioned within the interior region adjacent the sample target to receive light emitted from the plasma generation.