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为了研究探测高度对土壤激光等离子体的影响,调节收集系统处于11个不同高度进行实验,选取锌的472.21nm特征谱线作为分析线。实验结果表明,随着探测高度的增加,谱线强度、信背比先增大后减小。选取土壤基体元素铁的四条特征谱线计算等离子体温度和铝元素的一条特征谱线计算电子密度,得到了等离子体温度和电子密度在不同探测高度的变化特性,实验结果表明在2mm探测高度处,等离子体温度和电子密度最大。
In order to study the influence of the height of the probe on the laser plasma in the soil, the experiment was conducted at 11 different heights to adjust the collection system. The 472.21 nm characteristic line of zinc was selected as the analytical line. Experimental results show that with the increase of detection height, the line intensity, signal-to-background ratio first increase and then decrease. The four characteristic lines of soil matrix element iron were selected to calculate the electron density by calculating the plasma temperature and a characteristic line of the aluminum element. The variation characteristics of the plasma temperature and the electron density at different detection heights were obtained. The experimental results show that at the detection height of 2mm, , Plasma temperature and electron density maximum.