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为深入了解激光诱导击穿光谱技术应用于钢液成分的检测机制,对45#钢样品分别为高温熔融液态和冷却凝固后的固态样品的激光诱导击穿光谱特性进行了对比分析。实验表明,相比固体样品,在相同实验条件下对钢液进行直接测量的稳定性相对较差。各波段的光谱强度液态钢的要明显强于固态钢,两者的等离子体特性存在较大差别。采用Fe的五条原子谱线用于估算两种形态样品的等离子体温度,Si的一条原子谱线390.55nm用于计算电子密度。结果表明,高温液态钢的等离子体温度和电子密度均高于常温固态钢,样品本身温度和形态的差异是导致两种形态样品等离子体特性和光谱特性存在差异的重要原因。
In order to further understand the mechanism of laser-induced breakdown spectroscopy applied to the composition of molten steel, the laser-induced breakdown spectra of 45 # steel samples were respectively analyzed by high temperature molten liquid and solidified sample after cooling and solidification. Experiments show that, compared with solid samples, the stability of direct measurement of molten steel under the same experimental conditions is relatively poor. The spectral intensity of each band of liquid steel is significantly stronger than solid steel, the plasma characteristics of the two are quite different. Five atomic lines of Fe were used to estimate the plasma temperature of two morphological samples. One atomic line of Si, 390.55 nm, was used to calculate the electron density. The results show that the plasma temperature and electron density of high temperature liquid steel are higher than those of normal temperature solid steel. The difference of the temperature and morphology of the sample itself is the main reason for the difference of the plasma characteristics and the spectral characteristics of the two samples.