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激光诱导击穿光谱(LIBS)技术被用来定量分析矿石样品元素成分。波长为1064 nm的Nd∶YAG脉冲激光聚焦在样品表面后产生激光等离子体,等离子体原子发射谱由微型光谱仪记录。为了优化实验条件,研究了激光能量和延时时间等部分参数对谱线强度的影响。实验发现激光脉冲能量对光谱信号的影响大。在选定的变化范围内,改变延时对光谱的影响较小。实验中分别以硅(Si I谱线251.6 nm)和镁(Mg I谱线285.2 nm)为分析线,采用外定标法对硅和镁的含量进行了反演,测得的硅和镁元素含量值与标准值的相对误差分别为7%和3%。
Laser Induced Breakdown Spectroscopy (LIBS) was used to quantitatively analyze the elemental composition of ore samples. The Nd: YAG pulsed laser with a wavelength of 1064 nm focused on the sample surface to generate laser plasma, and the plasma atomic emission spectrum was recorded by a micro-spectrometer. In order to optimize the experimental conditions, the effects of some parameters such as laser energy and delay time on the spectral intensity were studied. The experimental results show that laser pulse energy has a great influence on the spectral signal. Within the selected range of change, the effect of changing the delay on the spectrum is small. In the experiment, the content of silicon and magnesium were inversely analyzed by the external calibration method using Si (251.6 nm) and Mg (285.2 nm) as the analytical lines respectively. The measured contents of silicon and magnesium The relative error between the content value and the standard value is 7% and 3% respectively.