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为了获得高质量的激光诱导等离子体发射谱,在激光诱导等离子体附近放置平面反射镜,通过改变平面反射镜与等离子体中心轴线之间的距离,观测反射镜对土壤等离子体辐射强度的影响;利用Boltzmann图法和光谱线Stark展宽法测量了等离子体的电子温度Te和电子密度Ne,并解释了辐射增强的机理。实验结果表明,平面反射镜对等离子体辐射有一定程度的增强作用,当平面反射镜与等离子体中心轴线的间距为3 mm时,样品元素Cr、Fe和Ca的光谱线强度比无反射镜时的分别提高了49.3、50.1和75.9%,光谱信噪比(SNR)分别提高了56.8、47.5和65.5%,Te升高了1250K,Ne增加了0.62×1015 cm-3;随着反射镜与等离子体中心轴线之间距离的增大,等离子体辐射强度逐渐减弱。
In order to obtain high quality laser-induced plasma emission spectra, a plane mirror is placed near the laser-induced plasma and the influence of the mirror on the radiation intensity of the soil plasma is observed by changing the distance between the plane mirror and the central axis of the plasma. The electron temperature Te and electron density Ne of the plasma were measured by Boltzmann diagram and spectral line Stark broadening method, and the mechanism of radiation enhancement was explained. The experimental results show that the plane mirror can enhance the plasma radiation to a certain degree. When the distance between the plane mirror and the central axis of the plasma is 3 mm, the spectral line intensities of the elements Cr, Fe and Ca are less than those of the mirror (SNR) increased by 56.8, 47.5 and 65.5%, Te increased by 1250K and Ne increased by 0.62 × 1015 cm-3, respectively. With the increase of reflectance and plasma The distance between the center axis of the body increases, and the plasma radiation intensity gradually decreases.