Adaptive Selection Method for Analytical Lines in Laser-Induced Breakdown Spectra

Pan Lijian; Chen Weifang; Cui Rongfang; Li Miaomiao

doi:10.3788/CJL202047.0811001

Chinese Journal of Lasers, Volume. 47, Issue 8, 811001(2020)

Adaptive Selection Method for Analytical Lines in Laser-Induced Breakdown Spectra

Pan Lijian, Chen Weifang^*, Cui Rongfang, and Li Miaomiao

College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing, Jiangsu 210001, China

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Figures & Tables(10)

Fig. 1. Flowchart of PSO-GA algorithm

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Fig. 2. Schematic diagram of LIBS experimental system

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Fig. 3. Spectrum of aluminum alloy

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Fig. 4. Calibration curves based on optimal spectral lines. (a) Mg; (b) Mn; (c) Si; (d) Fe

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Fig. 5. Comparison of fitness values between the optimal line and other spectral lines. (a) Mn; (b) Si

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Fig. 6. Comparison of goodness of fit between the optimal line and other spectral lines. (a) Mn; (b) Si

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Fig. 7. Evolutionary graphs of different methods

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Table 1. Content of main non-Al elements in different standard samples of aluminum alloy%
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Table 1. Content of main non-Al elements in different standard samples of aluminum alloy%
Standard sample Si Fe Mn Mg
3003 0.135 0.384 1.070 0.013
5052 0.120 0.150 0.006 2.56
5083 0.044 0.086 0.617 4.22
5962 0.587 0.392 0.417 3.41
6061 0.640 0.546 0.094 1.00
6063a 0.390 0.135 0.0036 0.825
6063b 0.419 0.187 0.055 0.540

Table 2. Results of optimal characteristic lines optimized by PSO-GA
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Table 2. Results of optimal characteristic lines optimized by PSO-GA
Analytical element Generation number Analytical lines /nm Reference lines /nm F_G R²
Mg 38 277.986 236.870 0.503 0.991
Mn 31 259.365 265.249 0.636 0.987
Si 25 288.158 396.171 1.029 0.936
Fe 43 274.627 396.171 0.745 0.972

Table 3. Comparison of optimization results calculated by different methods
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Table 3. Comparison of optimization results calculated by different methods
Method Generationnumber Convergencetime /s F_G
PSO 36 18.7 0.721
GA 54 31.5 0.636
PSO-GA 31 21.4 0.636

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Pan Lijian, Chen Weifang, Cui Rongfang, Li Miaomiao. Adaptive Selection Method for Analytical Lines in Laser-Induced Breakdown Spectra[J]. Chinese Journal of Lasers, 2020, 47(8): 811001

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