摘要
免定标(CF)方法是一种面向激光诱导击穿光谱(LIBS)的定量分析方法,可在无定标曲线的情况下直接完成探测元素的含量计算,但传统CF-LIBS的实际定量结果往往与真实值存在一定差距。为了提高CF-LIBS定量分析结果的精度,本文使用三种不同质量比的标准铜锌合金靶进行CF-LIBS定量分析计算,通过“准光学薄态逼近”和“谱线自吸收校正”,成功实现了合金靶中Zn/Cu质量比的准确定量。在具体实施过程中,首先通过调节“激光能量”和“探测延时”逼近元素双线比的理论强度值,以此寻获等离子体的“准光学薄”状态。在此基础上,根据元素谱线计算相应的自吸收系数,依据该系数进行LIBS光谱强度的修正,以此完成LIBS谱线的自吸收校正。两部分工作的有效结合,显著提升了CF-LIBS定量的分析精度,结果显示测算的铜锌元素质量比与实际含量非常吻合,三种标准铜锌合金靶的定量误差均小于3.5%,证明了本文所提出方法的有效性和合理性,未来有望在其他领域获得应用验证。
The calibration-free(CF)method is a quantification approach for laser-induced breakdown spectroscopy(LIBS)that enables the content determination of detected elements without a calibration curve.However,the actual quantitative results of traditional CF-LIBS often exhibit discrepancies with respect to the real values.In order to improve the accuracy of CF-LIBS quantitative analysis results,three standard Cu-Zn alloy targets with different mass ratios were used for the calculation of CF-LIBS quantitative analysis,and accurate quantification of the Zn/Cu quality ratio in the alloys was successfully achieved through utilization of"quasi-optically thin state"and"self-absorption correction".In the implementation,we firstly approached the theoretical intensity ratio of copper lines(I521.8 nm/I515.3 nm)by adjusting laser energies and detection delays,so as to find the"quasi-optically thin state"of the plasma.And then,under such a plasma state,the spectral intensity was well corrected by the selfabsorption via referencing the corresponding coefficient.Based on the proposed method,the Cu/Zn quality ratio was accurately determined using CF-LIBS,exhibiting excellent agreement with the actual content.The quantitative biases of the three standard copper-zinc alloy targets were observed all less than 3.5%,indicating high precision of measurements.It proves that the developed method is effective in improving alloys quantitation of LIBS,and more applications are expected in other fields in the future.
作者
张轩搏
李守杰
李颖
田野
叶旺全
郭金家
郑荣儿
卢渊
ZHANG Xuanbo;LI Shoujie;LI Ying;TIAN Ye;YE Wangquan;GUO Jinjia;ZHENG Ronger;LU Yuan(College of Physics and Optoelectronic Engineering,Ocean University of China,Qingdao 266100,China)
出处
《量子电子学报》
CAS
CSCD
北大核心
2024年第3期485-495,共11页
Chinese Journal of Quantum Electronics
基金
国家自然科学基金(62205320)。
关键词
光谱学
定量分析
免定标
自吸收校正
准光学薄态
铜锌合金
spectroscopy
quantitative analysis
calibration-free
self-absorption correction
quasioptically thin state
copper-zinc alloys
