A method for improving the accuracy of calibration-free laser-induced breakdown spectroscopy (CF-LIBS) using determined plasma temperature by genetic algorithm (GA)

2015 ◽  
Vol 30 (6) ◽  
pp. 1336-1344 ◽  
Author(s):  
Juan Dong ◽  
Long Liang ◽  
Jiao Wei ◽  
Hongsheng Tang ◽  
Tianlong Zhang ◽  
...  
Keyword(s):  
Standard Sample ◽  
Plasma Temperature ◽  
The Self ◽  
Laser Induced Breakdown Spectroscopy ◽  
Internal Reference ◽  
Absorption Effect ◽  
Breakdown Spectroscopy ◽  
External Standard ◽  
Laser Induced Breakdown ◽  
Calibration Free

An internal reference-external standard with iteration correction (IRESIC) method is proposed to correct for the self-absorption effect and plasma temperature in CF-LIBS based on an internal reference line and one standard sample.

scholarly journals Determination of Species Concentrations of Ti-6Al-4V Titanium Alloys using Calibration Free Laser Induced Breakdown Spectroscopy

2018 ◽  
Vol 3 (8) ◽  
pp. 50 ◽  
Author(s):  
Tagreed K. Hamad ◽  
Hussein Thamer Salloom
Keyword(s):  
Energy Levels ◽  
Surface Hardness ◽  
Plasma Temperature ◽  
Hardness Test ◽  
Spectral Lines ◽  
Laser Induced Breakdown Spectroscopy ◽  
Boltzmann Plot ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Calibration Free

In this study, Calibration-free Laser-induced breakdown spectroscopy (CF-LIBS) was applied to quantitatively analyze the elemental composition of Ti-6Al-4V titanium based alloy samples with no need for matrix-matched calibration procedure. Nd:YAG pulsed laser operating at a wavelength of 1064 nm was focused onto the sample to generate plasma. The spectrum of plasma was recorded using spectrophotometer then compared to NIST spectral lines to determine characteristic wavelengths, energy levels and other spectroscopic parameters. The values of plasma temperature obtained using Boltzmann plot for four examined samples ranged from 7439 to 6826 K while the electron density for each element was determined using Boltzmann-Saha equation. The concentration of Ti, Al, V and Fe has been determined and were within the samples nominal concentrations obtained from XRF analysis.  The calculated average relative errors of Ti, Al, V and Fe were 0.39%, 4.38%, 4.94 % and 8.2 %, respectively. Finally, there was a direct proportionality relation between the ratio of ionic to neutral emission lines of Ti for four samples and the surface hardness values measured mechanically using Vickers hardness test. The ratio at   had the best linear regression value (R2=0.95) which indicates the best correlation with surface hardness.

scholarly journals Correction: Investigation of the self-absorption effect using spatially resolved laser-induced breakdown spectroscopy

2020 ◽  
Vol 35 (7) ◽  
pp. 1495-1495
Author(s):  
Rongxing Yi ◽  
Lianbo Guo ◽  
Changmao Li ◽  
Xinyan Yang ◽  
Jiaming Li ◽  
...  
Keyword(s):  
The Self ◽  
Laser Induced Breakdown Spectroscopy ◽  
Absorption Effect ◽  
Breakdown Spectroscopy ◽  
Spatially Resolved ◽  
Laser Induced Breakdown

Correction for ‘Investigation of the self-absorption effect using spatially resolved laser-induced breakdown spectroscopy’ by Rongxing Yi et al., J. Anal. At. Spectrom., 2016, 31, 961–967, DOI: 10.1039/C5JA00500K.

Investigation of the self-absorption effect using spatially resolved laser-induced breakdown spectroscopy

2016 ◽  
Vol 31 (4) ◽  
pp. 961-967 ◽  
Author(s):  
Rongxing Yi ◽  
Lianbo Guo ◽  
Changmao Li ◽  
Xinyan Yang ◽  
Jiaming Li ◽  
...  
Keyword(s):  
The Self ◽  
Laser Induced Breakdown Spectroscopy ◽  
Absorption Effect ◽  
Breakdown Spectroscopy ◽  
Spatially Resolved ◽  
Laser Induced Breakdown

This study discovered the distributional difference of self-absorption effect in laser-induced breakdown spectroscopy, and investigated the method to reduce the self-absorption effect.

Investigation of the multi-elemental self-absorption mechanism and experimental optimization in laser-induced breakdown spectroscopy

2020 ◽  
Vol 35 (5) ◽  
pp. 912-926
Author(s):  
Song Cai ◽  
Yun Tang ◽  
Fan Wang ◽  
Yonggang Xiong ◽  
Xiao Sun ◽  
...  
Keyword(s):  
The Self ◽  
Laser Induced Breakdown Spectroscopy ◽  
Absorption Mechanism ◽  
Absorption Effect ◽  
Experimental Optimization ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The self-absorption effect reduces the accuracy of element measurements in laser-induced breakdown spectroscopy (LIBS) experiments.

A Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS) Quantitative Analysis Method Based on the Auto-Selection of an Internal Reference Line and Optimized Estimation of Plasma Temperature

2017 ◽  
Vol 72 (1) ◽  
pp. 129-140 ◽  
Author(s):  
Jianhong Yang ◽  
Xiaomeng Li ◽  
Jinwu Xu ◽  
Xianghong Ma
Keyword(s):  
Quantitative Analysis ◽  
Plasma Temperature ◽  
Reference Line ◽  
Analysis Method ◽  
Internal Reference ◽  
Absorption Effect ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Quantitative Analysis Method ◽  
Selection Of

The quantitative analysis accuracy of calibration-free laser-induced breakdown spectroscopy (CF-LIBS) is severely affected by the self-absorption effect and estimation of plasma temperature. Herein, a CF-LIBS quantitative analysis method based on the auto-selection of internal reference line and the optimized estimation of plasma temperature is proposed. The internal reference line of each species is automatically selected from analytical lines by a programmable procedure through easily accessible parameters. Furthermore, the self-absorption effect of the internal reference line is considered during the correction procedure. To improve the analysis accuracy of CF-LIBS, the particle swarm optimization (PSO) algorithm is introduced to estimate the plasma temperature based on the calculation results from the Boltzmann plot. Thereafter, the species concentrations of a sample can be calculated according to the classical CF-LIBS method. A total of 15 certified alloy steel standard samples of known compositions and elemental weight percentages were used in the experiment. Using the proposed method, the average relative errors of Cr, Ni, and Fe calculated concentrations were 4.40%, 6.81%, and 2.29%, respectively. The quantitative results demonstrated an improvement compared with the classical CF-LIBS method and the promising potential of in situ and real-time application.

Accuracy improvement of boron by molecular emission with a genetic algorithm and partial least squares regression model in laser-induced breakdown spectroscopy

2018 ◽  
Vol 33 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Zhihao Zhu ◽  
Jiaming Li ◽  
Yangmin Guo ◽  
Xiao Cheng ◽  
Yun Tang ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Partial Least Squares Regression ◽  
The Self ◽  
Laser Induced Breakdown Spectroscopy ◽  
Least Squares Regression ◽  
Absorption Effect ◽  
Accuracy Improvement ◽  
Molecular Emission ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

We chose BO molecular emission to reduce the self-absorption effect in atomic LIBS and applied GA-PLSR to improve the molecular calibration.

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