Laser Ablation Spectroscopy Apparatus for Elemental Analysis
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Solution Overview
Problem
Current methods for elemental composition analysis, such as ICP-OES, are costly, complex, and generate hazardous waste, while LIBS instruments struggle with consistent plasma plume generation and are limited in analyzing liquid samples, leading to variability and inefficiency in industrial applications like petroleum refining and fuel analysis.
Innovation Solution
A compact, portable LIBS apparatus with a pulsed laser, nebulizer, and optical system for aerosol generation and spectral analysis, capable of analyzing both solid and liquid samples with high accuracy and sensitivity, using a system computer for precise sample positioning and data processing, and a method involving laser ablation to generate a plasma plume for elemental composition mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ICP-OES is used for elemental composition analysis, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the essential function of elemental analysis from the complex ICP-OES system by using laser-induced breakdown spectroscopy (LIBS) which requires minimal sample preparation. The laser ablation technique directly vaporizes and ionizes the sample surface, eliminating the need for acid digestion, quartz glassware, and complex sample handling procedures while maintaining analytical capability for multiple elements
Solution Approach 2:
The LIBS apparatus is designed to analyze multiple elements (metals, light elements, halogens) across different sample types (solids, liquids, aerosols) using a single instrument platform. The system can detect elements from lithium to uranium and light elements like hydrogen, carbon, nitrogen, oxygen, and halogens, providing universal analytical capability without requiring multiple specialized instruments
2Measurement precision
If ICP-OES is used for elemental analysis, then detection sensitivity is improved, but loss of time and productivity decrease
Solution Approach 1:
The laser ablation process performs preliminary sample vaporization and atomization directly at the measurement point, eliminating time-consuming sample preparation steps like acid digestion and filtration. The system is pre-configured with multiple spectrometers covering different wavelength ranges to simultaneously detect multiple elements, enabling rapid analysis without sequential processing
Solution Approach 2:
The patent replaces the mechanical sample handling and chemical digestion processes of ICP-OES with a optical-based LIBS system. The laser beam directly interacts with the sample to generate plasma, and spectral analysis is performed optically without mechanical sample transfer, digestion vessels, or complex flow systems, enabling field deployment and rapid analysis
3Measurement precision
If ICP-OES is used for analysis, then measurement accuracy is improved, but object-generated harmful factors increase
Solution Approach 1:
The patent converts the potentially harmful laser energy into a beneficial analytical tool. The high-power laser pulse creates a plasma plume that serves as both the atomization source and the detection medium, eliminating the need for hazardous chemicals. The plasma itself becomes the vehicle for generating the spectral signal, turning a potentially destructive process into a clean analytical method
4Productivity
If LIBS is used for rapid analysis, then productivity is improved, but measurement precision deteriorates due to plasma plume variability
Solution Approach 1:
The system incorporates real-time feedback through multiple spectrometers detecting plasma emission across different wavelength ranges simultaneously. The spectral data from multiple elements and transition lines provide feedback on plasma conditions, allowing for normalization and correction of variability. The system can detect both atomic and ionic lines to monitor plasma temperature and density, enabling compensation for plume conditions
5Ease of operation
If LIBS is used for solid sample analysis, then ease of operation is improved, but adaptability to liquid samples deteriorates
Solution Approach 1:
The LIBS apparatus is designed with universal sample introduction capabilities that can handle solids, liquids, and aerosols using the same laser ablation and plasma generation mechanism. For liquids, the system can analyze droplets, streams, or aerosolized samples without requiring a complete redesign of the optical path or plasma generation system, maintaining ease of operation while expanding adaptability
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
Enables rapid, reliable, and cost-effective elemental analysis of major and trace elements in both solid and liquid samples with minimal sample preparation and no hazardous waste generation, improving process efficiency and accuracy in industries like petroleum refining and fuel analysis.
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
Apparatus for laser induced ablation spectroscopy (LIBS) is disclosed. An apparatus can have a computer, a pulsed laser and a lightguide fiber bundle that is subdivided into branches. One branch can convey a first portion of the light to a first optical spectrometer and a different branch can convey a second portion of the light to another optical spectrometer. The first spectrometer can be relatively wideband to analyze a relative wide spectral segment and the other spectrometer can be high dispersion to measure minor concentrations. The apparatus can have a plurality of spectrometers with distinct and/or complementary capabilities, and can include an inductively coupled plasma mass spectrometer and data and instructions in tangible media operable to obtain a synergistic composition analysis based on optical spectra and ion mass to charge ratio peaks from the mass spectrometer.