摘要
激光诱导发射光谱分析技术是目前正被广泛发展的一种元素定量检测手段,其分析结果的准确性与精度和分析基体的物理化学特性紧密相关。本文采用波长为1064 nm的激光烧蚀煤样,以中阶梯光谱仪和ICCD分析诱导产生的等离子体发射光谱。通过试验基体的不同形态特性对各种元素定量分析特征光谱的强度、稳定性以及元素分析探测限的影响,研究激光诱导煤粉发射光谱的基体效应规律,并从激光等离子体形成的理论机制上进行实验分析.研究表明,适中的煤粉颗粒尺寸与样品密度更有利于激光诱导煤粉发射光谱的定量分析。
The feasibility of laser-induced breakdown spectroscopy as a diagnostic tool for elementary analysis was documented widely, as well as the matrix effect of target material was proved to be remarkable impact on the spectral analysis. The influence of physical characteristics of fine coal, including particle size and area density, on the emission spectrum was surveyed, such as spectral intensity, standard deviation of characteristic spectrum and the detection threshold. An intense laser radiation with a wavelength of 1064 nm was used to ablate fine coal to form plasma plume, and the emission spectrum emitted as the plasma cooling off was analyzed by high-resolution echelle grating spectrometer coupled to intensified CCD camera. The results suggest that moderate particle size and material density are more advantageous to quantitative analysis of coal by laser-induced breakdown spectroscopy than the smallest or biggest size, which can be interpretable by heat-transfer mechanism in target after a shot of laser pulse.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第2期331-334,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No．50576029)
国家自然科学基金项目(No．50646037)
关键词
激光诱导击穿光谱
煤粉
基体效应
定量分析
laser-induced breakdown spectroscopy
fine coal
matrix effect
quantitative analysis
