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Multifiber Dimension-Conversion Laser-Induced Breakdown Spectroscopy (MFDC-LIBS): Real-Time Spatially Resolved LIBS
Ze Tian1, Yue Tang1, Weiheng Kong1
1Research Center of Analytical Instrumentation, School of Mechanical Engineering, Sichuan University, Chengdu 610065, People's Republic of China.
Analytical Chemistry
|January 6, 2026
Summary
A new multifiber dimension-converting LIBS (MFDC-LIBS) system improves elemental analysis accuracy. This laser-induced breakdown spectroscopy method enhances quantitative precision for in situ compositional analysis of materials.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Background:
- Laser-induced breakdown spectroscopy (LIBS) offers rapid compositional analysis but struggles with accuracy due to uneven elemental distribution in plasma plumes.
- In situ analysis is limited by the restricted accuracy and stability of conventional LIBS quantitative methods.
Purpose of the Study:
- To develop a novel multifiber dimension-converting LIBS (MFDC-LIBS) system to address elemental distribution challenges.
- To investigate the differentiated characterization of elemental distribution within a single plasma plume.
- To enhance the accuracy and stability of LIBS quantitative analysis.
Main Methods:
- Development of a proof-of-concept MFDC-LIBS system utilizing 100 optical fibers.
- Simultaneous collection of 2D spatial distribution information from plasma plume.
- Implementation of an array-to-linear transformation and spectral dispersion using a reflection grating.
- Direct plasma image capture via an area-array CMOS detector.
Main Results:
- The MFDC-LIBS system demonstrated significantly improved linearity, quantitative accuracy, and stability.
- Root-mean-square error (RMSE) was reduced by 74% for Ca, 70% for Ba, 77% for Mg, and 66% for Na in rock samples.
- Successful differentiation of elemental distribution within the plasma plume was achieved.
Conclusions:
- The MFDC-LIBS system provides a robust and scalable approach for enhanced analytical precision in LIBS.
- This method merges spatial diagnostics with improved quantitative capabilities for complex solid materials.
- MFDC-LIBS overcomes limitations of conventional LIBS for accurate in situ compositional analysis.
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