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采用高能量钕玻璃激光器(~15J)在高压环境气体中激发诱导土壤等离子体,气体压强为0.9MPa,研究了不同环境气氛(高纯的氩气、氮气和二氧化碳气体)中,土壤等离子体辐射和电子温度的空间分布情况。以Ti的334.941nm和Mn的344.199nm两条谱线作为发射光谱观测线来分析说明等离子体辐射强度的空间分布规律,实验结果表明,在等离子体的轴向距离样品表面约z=1.5mm位置区域,等离子体辐射强度最大。利用Ti的334.941nm和337.280nm两条谱线测量得到沿等离子体轴向1.0mm和1.5mm高度区域的电子温度,结果显示,z=1.0mm区域的电子温度较高;在等离子体中心轴线区域的电子温度最高,并沿等离子体的径向单调递减;在不同环境气体中电子温度变化特征有所不同。
High-energy neodymium glass laser (~ 15J) was used to induce soil plasmas in high-pressure gas at a pressure of 0.9 MPa. The effects of soil-based plasma radiation on high-purity argon (argon, nitrogen and carbon dioxide) And the spatial distribution of electron temperature. The spatial distribution of the radiation intensity of the plasma was analyzed by using the two lines of 334.941 nm and 344.199 nm of Mn as the emission line observation line. The experimental results show that at the position of the plasma approximately z = 1.5 mm from the surface of the sample Region, the maximum plasma radiation intensity. The electron temperature in the region of 1.0 mm and 1.5 mm along the plasma axis was measured by using the two lines of 334.941 nm and 337.280 nm of Ti. The results showed that the electron temperature in the region of z = 1.0 mm was higher; in the region of the central axis of the plasma The electron temperature is the highest and decreases monotonously along the radial direction of the plasma. The characteristics of electron temperature change in different ambient gases are different.