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为改善激光诱导击穿光谱的质量,提高激光诱导击穿光谱技术对土壤样品的检测能力,研究了圆形碳片距离样品表面的高度变化对土壤等离子体辐射强度的影响,并通过Boltzmann图方法和光谱线Stark展宽法测量了等离子体的电子温度和电子密度。实验结果表明,当有碳片从轴向约束等离子体时,等离子体辐射强度比没有碳片约束时的明显增强;随着碳片距离样品表面高度的加大,等离子体辐射强度逐渐升高并在11mm处达到最强,随后减弱。计算可知,样品中元素Fe、Mn、K和Ti在碳片距离靶面11mm处的谱线强度要比无碳片约束时的分别提高179.88%、117.02%、123.21%和91.24%;光谱信噪比分别提高107.30%、92.26%、68.48%和67.66%;等离子体的电子温度升高2800K,电子密度升高2.16×1016 cm-3。研究结果为土壤中痕量元素的检测提供了一种简单、易行的方法。
In order to improve the quality of laser-induced breakdown spectroscopy and improve the detection ability of laser-induced breakdown spectroscopy on soil samples, the effect of height variation of the circular carbon plate on the plasma of the soil was studied and the Boltzmann diagram And spectral line Stark broadening method to measure the plasma electron temperature and electron density. The experimental results show that the plasma radiation intensity is significantly enhanced when the carbon plate is restrained from the axial restraint plasma and the plasma radiation intensity is gradually increased as the distance from the carbon plate to the surface of the sample increases Strongest at 11mm, then weakened. The results show that the intensities of the lines of Fe, Mn, K and Ti in the sample at the position 11mm away from the target surface are increased by 179.88%, 117.02%, 123.21% and 91.24%, respectively. (107.30%, 92.26%, 68.48% and 67.66% respectively). The plasma electron temperature increased 2800K and the electron density increased 2.16 × 1016 cm-3. The results provide a simple and easy method for the detection of trace elements in soil.