【摘要】 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。更多还原

【Abstract】 patial distributions of radiant intensity and electron temperature in laser-induced soil plasma were studied.The plasma was generated with soil in different gases at high pressure using a high-energy neodymium glass laser.Very pure Ar,N2,and CO2 gases were used as an ambient gas and the pressure was up to 0.9MPa.The spectral lines of Ti Ⅱ 334.941nm and Mn Ⅱ 344.199nm were used as the observation lines of the emission spectrum to analyze and illuminate the law of spatial distribution of the emission intensity.The experimental results show that the intensities of the emission spectrum reached the maximum values in the emitting region of plasma’s axial distance from the sample surface z=1.5mm.The electron temperature was obtained from the spectral lines of Ti Ⅱ 334.941nm and Ti Ⅱ 337.280nm separately at axial distance z=1.0mm and z=1.5mm.The results reveal that in the emitting region,the temperature was higher at the axial distance z=1.0mm;it has its maximum at the plasma axis and shows a monotonous decrease towards the border;the variety characteristic of the electron temperature was different in various surrounding gases.更多还原