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为了提高激光诱导击穿光谱的质量,采用高能量铷玻璃脉冲激光烧蚀土壤样品,由组合式多功能光栅光谱仪和CCD探测器等组成的光谱分析系统记录光谱信息,研究了有或无CsCl样品添加剂时多个激光脉冲作用于土壤样品同一位置条件下,每个激光诱导等离子体辐射强度的变化情况,并通过Boltzmann图方法测量了等离子体的电子温度。实验结果表明,随着激光脉冲序数的增大,等离子体辐射逐渐增强。计算可知,对于含有15%CsCl的样品,第6个激光脉冲等离子体中元素Fe、Mn、K和Ti的谱线强度比第2个激光脉冲的分别提高了3.59、2.46、2.82和1.62倍;光谱信噪比分别提高了3.03、1.97、2.28和1.40倍;而第6个激光脉冲等离子体的温度比第2个的升高了5 360 K。
In order to improve the quality of laser-induced breakdown spectroscopy, a high-energy rubidium glass laser was used to ablate soil samples. The spectral information was recorded by a combination of multi-function grating spectrometer and CCD detector. Under the condition of multiple laser pulses acting on the same position of the soil sample, each laser induced a change in the intensity of the plasma radiation, and the electron temperature of the plasma was measured by the Boltzmann graph method. Experimental results show that with the increase of laser pulse number, the plasma radiation gradually increases. Calculations show that the spectral intensities of the Fe, Mn, K and Ti elements in the sixth laser pulse plasma increase by 3.59, 2.46, 2.82 and 1.62 times respectively than that of the second laser pulse in the samples containing 15% CsCl. The spectral signal-to-noise ratio increased by 3.03, 1.97, 2.28 and 1.40 times respectively; while the temperature of the sixth laser pulse plasma was increased by 5 360 K compared with that of the second one.