Portable LIBS Analysis for Consistent Liquid and Solid Plasma Plumes
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Solution Overview
Problem
Current methods for elemental composition analysis, such as LIBS, face challenges with variability in plasma plume generation and are not suitable for rapid, reliable, and cost-effective analysis of both solid and liquid samples, particularly in industrial settings like petroleum refining, due to issues like sample volatility and surface tension affecting optical alignment and sensitivity.
Innovation Solution
A compact, portable LIBS apparatus with a pulsed laser, nebulizer, and optical system that generates a plasma plume from both liquid and solid samples, using a system computer for precise sample positioning and spectral data analysis, enabling high accuracy and reproducibility in elemental composition measurement without sample preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ICP-OES is used for multi-element analysis, then detection limits for metals can reach sub-ppm level, but the equipment complexity, power consumption, and sample preparation requirements increase significantly
Solution Approach 1:
The patent extracts the essential function of elemental analysis from the complex ICP-OES system and implements it through a simplified LIBS apparatus. By removing unnecessary components (complex sample introduction systems, high-purity gas flow systems, sophisticated consumables), the invention achieves sub-ppm detection limits with a portable, simplified device that uses minimal sample preparation.
Solution Approach 2:
The patent replaces the mechanical and chemical complexity of ICP-OES (acid digestion, quartz glassware, high-power argon flow) with an optical-based LIBS system. The laser-induced plasma generation substitutes for the inductively coupled plasma, eliminating the need for complex mechanical sample preparation and high-power gas flow systems while maintaining sub-ppm detection capability.
2Productivity
If LIBS is used for liquid sample analysis, then analysis speed improves, but plasma plume generation becomes inconsistent due to sample volatility and surface tension
Solution Approach 1:
The patent introduces an intermediary substance (immiscible liquid or solid support material) that mediates between the laser and the volatile liquid sample. This intermediary provides a stable surface for consistent plasma plume generation while allowing the volatile analytes to be effectively ablated and detected, thus maintaining both analysis speed and plasma consistency.
Solution Approach 2:
The patent modifies physical parameters such as laser pulse duration, energy density, and timing to optimize plasma generation on volatile liquid samples. By adjusting these parameters, the system achieves consistent plasma plume formation despite the challenges of sample volatility and surface tension, maintaining both speed and reliability.
3Measurement precision
If dissolution in acid is used for compositional analysis, then measurement accuracy improves, but hazardous chemical waste is generated and disposal costs increase
Solution Approach 1:
The patent converts the potential harm of direct laser irradiation on samples into a benefit by using the laser-induced plasma as both the ablation mechanism and the detection medium. The plasma naturally atomizes and excites the sample elements without requiring harsh chemical digestion, thereby eliminating hazardous waste while maintaining compositional accuracy through optical emission spectroscopy.
4Reliability
If commercial LIBS instruments are used for solid sample analysis, then reliability improves, but adaptability to liquid samples and portability are limited
Solution Approach 1:
The patent designs a universal LIBS apparatus that can analyze multiple sample types (solids, liquids, aerosols) using the same basic configuration. By implementing a flexible sample introduction system and adjustable analysis parameters, the instrument achieves reliable analysis across different sample matrices without requiring separate specialized equipment for each sample type.
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 apparatus provides rapid, accurate, and sensitive analysis of major and trace elements in both solid and liquid samples, reducing costs and improving transportability, with the ability to measure every element on the periodic chart simultaneously, and generates no hazardous waste.
Implementation Method 1
A pulsed laser is focused on a sample site to generate a plasma plume during a laser ablation process
Implementation Method 2
The plasma plume can be detected with an optical spectrometer having an intensified charge coupled device
Data Source
AI summary
Methods of liquid and solid materials analysis by laser induced ablation spectroscopy are disclosed. The liquid and solid materials are analyzed in an instrument having one pulsed laser to produce emissive plasma plumes and ablate solid material. Liquid phase samples are aerosolized before streaming to an analysis zone where they are dissociated into a plasma plume. A large number of sites within solid phase sample structures and be analyzed using a movable x-y-z stage and displayed in a chemical map.