One‐point calibration LIBS based on Saha‐Boltzmann plot and self‐absorption correction

HU Zhenlin; WANG Tianze; GUO Lianbo; LIN Nan

doi:10.3969/j.issn.1007-5461.2024.03.007

Chinese Journal of Quantum Electronics, Volume. 41, Issue 3, 455(2024)

One‐point calibration LIBS based on Saha‐Boltzmann plot and self‐absorption correction

HU Zhenlin1... WANG Tianze1, GUO Lianbo2,* and LIN Nan1,** |Show fewer author(s)

Author Affiliations

¹Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

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Fig. 1. Schematic diagram of experimental setup

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Fig. 2. LIBS spectra of the titanium alloy TC4-1

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Fig. 3. (a) The original, (c) OPC, and (e) OPC and self-absorption corrected (SAC) Boltzmann plots of TC4-2; (b) The original, (d) OPC, and (f) OPC and SAC Saha-Boltzmann plots of TC4-2 with a gate delay of 2 μs

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Table 1. Spectral lines selected for OPC-LIBS calculation

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Table 1. Spectral lines selected for OPC-LIBS calculation

Species	Spectral lines/nm
Ti I	363.55, 365.35, 395.63, 395.82, 398.18, 399.86, 498.17, 499.11, 499.95, 500.72
Ti II	253.13, 253.46, 253.59, 255.60, 257.10, 263.54, 263.86, 264.20, 264.59264.59, 295.88, 309.72, 314.80, 316.85, 319.09, 320.25, 328.77, 345.25, 345.64, 346.15, 347.72, 351.08, 352.03, 353.54, 359.60, 374.16, 390.05
V II	296.84, 300.12, 311.07, 313.97, 326.77, 354.52, 355.68
Al I	394.40, 396.15

Table 2. Quantitative results of titanium alloy samples of four OPC‐LIBS methods

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Table 2. Quantitative results of titanium alloy samples of four OPC‐LIBS methods

Samples	Methods	Mass fraction/%			MREs /%
Samples	Methods	Ti	V	Al	MREs /%
TC4-2	Certified content	91.17	3.43	5.40	-
	OPC-LIBS based on Boltzmann plot	91.59	3.81	4.60	8.78
	OPC-LIBS based on Saha-Boltzmann plot	91.15	3.79	5.06	5.60
	OPC-LIBS based on Boltzmann plot and self-absorption correction	91.48	3.81	4.71	8.07
	OPC-LIBS based on Saha-Boltzmann plot and self-absorption correction	90.92	3.78	5.30	4.11
TC4-3	Certified content	89.34	3.86	6.80	-
	OPC-LIBS based on Boltzmann plot	90.97	3.91	5.12	9.28
	OPC-LIBS based on Saha-Boltzmann plot	90.67	3.88	5.45	7.29
	OPC-LIBS based on Boltzmann plot and self-absorption correction	90.67	3.90	5.43	7.56
	OPC-LIBS based on Saha-Boltzmann plot and self-absorption correction	90.09	3.85	6.06	3.99
TC4-1	Certified content	90.37	5.70	3.93	-

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Zhenlin HU, Tianze WANG, Lianbo GUO, Nan LIN. One‐point calibration LIBS based on Saha‐Boltzmann plot and self‐absorption correction[J]. Chinese Journal of Quantum Electronics, 2024, 41(3): 455

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