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Related Experiment Video

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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Long-term repeatability improvement using beam intensity distribution for laser-induced breakdown spectroscopy.

Jiacen Liu1, Weiran Song1, Weilun Gu1

  • 1State Key Laboratory of Power System Operation and Control, International Joint Laboratory on Low Carbon Clean Energy Innovation, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China.

Analytica Chimica Acta
|March 16, 2023
PubMed
Summary
This summary is machine-generated.

Improving long-term signal repeatability in laser-induced breakdown spectroscopy (LIBS) is crucial. This study introduces a method modifying spectral intensity using laser beam distribution, significantly enhancing LIBS measurement consistency over time.

Keywords:
Beam intensity distributionBeam profileLaser-induced breakdown spectroscopyLong-term repeatabilitySignal correction

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Laser-induced breakdown spectroscopy (LIBS) faces challenges with measurement repeatability, hindering commercialization.
  • Improving long-term signal repeatability in LIBS is critical for practical applications but remains understudied.
  • Mechanisms causing long-term repeatability degradation in LIBS are not fully understood.

Purpose of the Study:

  • To develop and validate a novel method for enhancing the long-term repeatability of LIBS measurements.
  • To address the impact of day-to-day variations in laser beam intensity distribution on spectral signal consistency.
  • To investigate the effectiveness of modifying spectral intensity based on laser beam intensity profiles.

Main Methods:

  • Pre-processing of laser beam intensity distribution profiles and spectral intensity data.
  • Modeling the relationship between relative deviations in beam and spectral intensities using Partial Least Squares Regression (PLSR).
  • Testing the method on copper and silicon samples over an extended period (30+ days).

Main Results:

  • Observed day-to-day variations in laser beam intensity distribution directly impact spectral intensity and repeatability.
  • The proposed method successfully modified spectral intensity to compensate for beam variations.
  • Significant improvements in long-term repeatability were achieved, with Relative Standard Deviation (RSD) decreasing from ~13.5% to ~4% for copper and ~10.7% to 6.5% for silicon.
  • Valid correction rates for day-mean spectral intensity exceeded 70% for both sample types.

Conclusions:

  • The proposed method offers a viable solution for improving the long-term repeatability of LIBS measurements.
  • Accounting for laser beam intensity distribution is key to overcoming long-term repeatability issues in LIBS.
  • This approach enhances the reliability and commercial potential of LIBS technology.