基于LIBS技术的黄铜等离子体特征参量的研究

Measurement of brass plasma parameters based on laser-induced breakdown spectroscopy

为了减小测量误差,采用改进的Boltzmann方法和Lorentz函数拟合方法,迭代计算得到黄铜等离子体的电子温度是6051K,拟合CuⅠ324.75nm得到等离子体的电子密度是3.3×1017cm-3。结果表明,经过9次迭代,电子温度的线性相关系数由0.73提高到0.98;经过15次叠加,电子密度的拟合相关度由0.90提高到0.96。这一结果对于精确求解等离子体的特征参量是有帮助的。

In order to minimize the measurement errors, an improved iterative Boltzmann plot method and Lorentz fitting method were used. The electron temperature Te in brass plasma was 6051K with the iterative calculation, and the electron density Ne of 3.3 ×10^17cm^-3 was inferred from the Stark broadened profile of Cu I 324. 75nm. The results show that the correlation coefficient is increased from 0. 73 to 0. 98 after 9 iterations in calculation of Te, and the correlation coefficient increases from 0. 90 to 0. 96 after 15 averaged numbers in calculation of Ne. The results are helpful to accurately calculate the parameters of plasma.