Abstract：Laser-induced breakdown spectroscopy (LIBS) is a promising in-situ diagnosis technology for the wall materials in tokamak devices. Currently, it has been applied to the Experimental Advanced Superconducting Tokamak (EAST) devices, which can in real time, in situ and online monitor the surface composition of wall materials. But there is a challenge to get precisely quantitative result of wall surface in high vacuum environment. The high vacuum environment of EAST device was simulated, and five kinds of samples (nickel base alloy) were ablated by nanosecond pulsed laser to generate plasma and obtain spectra. The temperature and density of plasma were calculated by multi-Boltzmann slope method and Stark width method respectively. The One Point Correction method (OPC) was used to carry out quantitative research comparing with the Calibration-Free LIBS (CF-LIBS) method. The results showed OPC method could significantly improve the quantitative accuracy of each element in the alloy. For matrix element of Ni, the relative error was less than 3.92%. The relative error of Mo with atomic percent of 3.11% decreased from 155.41% to 34.32%. The quantitative method provided a theoretical reference for on-line measurement of impurity deposition on wall surface with LIBS technology.
刘佳敏, 吴鼎, 李聪, 丁洪斌. 高真空环境下激光诱导击穿光谱技术对镍基合金的定量分析研究[J]. 冶金分析, 2020, 40(12): 79-85.
LIU Jia-min, WU Ding, LI Cong, DING Hong-bin. Quantitative analysis of the nickel base alloy by laser-induced breakdown spectroscopy in high vacuum environment. , 2020, 40(12): 79-85.
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