Journal
APPLIED SPECTROSCOPY
Volume 73, Issue 2, Pages 152-162Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0003702818803943
Keywords
Long-short double-pulse laser-induced breakdown spectroscopy; DP-LIBS; steel; manganese; improvement
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Funding
- National Natural Science Foundation of China [51506171, 51675415, 51335009]
- National Key Research and Development Program of China [2017YFD0700200]
- Tokushima University
- Xi'an Jiaotong University
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A long-short double pulse laser-induced breakdown spectroscopy (long-short DP-LIBS) method was employed to improve the analytical performance of LIBS for the measurement of manganese in steel samples. The long pulse with a duration of 60 mu s was generated using a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser which was operated at free-running (FR) mode. To investigate the detection ability without sample preparation, the steel washers were tested using single-pulse LIBS (SP-LIBS) and long-short DP-LIBS, respectively. The measurement results show that long-short DP-LIBS was able to record clear spectra from the steel washers with a surface layer. Through the observation on the laser craters with a scanning electron microscope (SEM), the results suggest that the improvement in detection ability can be attributed to the pre-irradiation effect of long-pulse laser beam. Next, the analytical performance for quantitative measurement of manganese was evaluated employing ten standard steel samples. The results show that the linearity fit (R-2) of the calibration curve is 0.988 for long-short DP-LIBS, whereas, R-2 is only 0.810 for SP-LIBS under the same measurement conditions. The repeated measurement results show that the average relative standard deviation (RSD) of the tested samples is 29.3% for SP-LIBS and is 10.5% for long-short DP-LIBS. The prediction results also show that the average relative error of prediction (REP) is 94.9% for SP-LIBS and is 4.9% for long-short DP-LIBS.
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