光学学报, 2020, 40 (7): 0730001, 网络出版: 2020-04-15
遥测LIBS系统中样品位置波动对光谱特征参数的影响 下载: 853次
Influence of Sample Position Fluctuation on Spectral Characteristic Parameters in Telemetry LIBS System
光谱学 激光诱导击穿光谱 遥测 样品位置 光谱特征 相似度 spectroscopy laser induced breakdown spectroscopy telemetry sample position spectral characteristics similarity
摘要
搭建了由共轴Schwarzschild望远镜组成的遥测LIBS系统,研究了不同导轨位置下样品距离波动时LIBS特征谱线光谱强度、相对标准偏差、光谱相似度和等离子体温度的变化情况,并结合物理机制分析了特征参数变化的原因。结果表明,样品位置波动对等离子体温度、特征谱线强度和相对标准偏差有显著影响,而光谱相似度则在一定范围内保持稳定;在光谱满足一定相似度的情况下,样品位置波动允差随样品距离的增加呈线性递增。当前系统聚焦范围为1.9~4.1 m时,在光谱相似度为0.99的情况下,样品位置波动允差的范围为70~220 mm。研究结果有利于高性能光学系统设计,并为光谱的定性和定量分析提供了理论参考。
Abstract
The telemetry LIBS system including a coaxial Schwarzschild telescope is built to study the changes of the LIBS characteristic spectral line intensity, the relative standard deviation, the spectral similarity, and the plasma temperature, when the sample distance fluctuates at different guide positions, and to analyze the reasons for the changes of characteristic parameters based on the physical mechanism. The results show that the sample position fluctuation has a significant influence on the plasma temperature, the characteristic spectral line intensity, and the relative standard deviation, while the spectral similarity remains stable in a certain range. Under the condition that the spectrum satisfies a certain similarity, the tolerance of the sample position fluctuation increases linearly with sample distance. When the current system focus range is 1.9-4.1 m and the spectral similarity is 0.99, the range of the sample position fluctuation tolerance is 70-220 mm. The results are beneficial to the design of high-performance optical systems and provide theoretical references for qualitative and quantitative analysis of spectra.
苏亚辉, 王广谦, 潘从元, 沈川. 遥测LIBS系统中样品位置波动对光谱特征参数的影响[J]. 光学学报, 2020, 40(7): 0730001. Yahui Su, Guangqian Wang, Congyuan Pan, Chuan Shen. Influence of Sample Position Fluctuation on Spectral Characteristic Parameters in Telemetry LIBS System[J]. Acta Optica Sinica, 2020, 40(7): 0730001.