发射光谱法研究无极灯等离子体参数分布

Study on the Distribution of Plasma Parameters in Electrodeless Lamp Using Emission Spectrometry

使用电感耦合放电装置和拍型明泡,以氩-汞混合气体作为工作气体,在低气压下点亮了无极灯。利用发射光谱法,研究了无极灯点灯5s时的电子温度和电子密度随轴向和径向位置的变化规律。等离子体电子温度变化通过分析Ar原子425.9和750.4 nm谱线强度比值获得,等离子体电子密度的变化通过分析Ar原子750.4 nm谱线强度变化得到。实验发现泡体内的不同位置等离子体电子温度和密度不同。当轴向距离增加时,电子温度先缓慢增加后减少再迅速增加而后减少,电子密度先迅速增加后快速减少再缓慢增加而后减少;当径向距离增加时,电子温度先增加到平稳区而后再增加,电子密度逐渐减少。

Electrodeless lamp in pear shape was ignited using induetively coupled discharge setup and Ar-Hg mixtures as wor^mg gas. The changes in eleetronic temperature and density with axial and radial positions at 5 s of igniting were studied by means of emission spectrometry. The changes in electronic temperature were obtained according to the Ar line intensity ratio of 425.9 nm/ 750. 4 nm. And the variations in electronic density were analyzed using 750. 4 nm line intensity. It was found that plasma electronic temperature and density is various at different axial or radial positions. The electronic temperatures first increase, then decrease, and then increase quickly, and finally decline. While the electronic density firstly increase quickly, the decrease, and then rise slowly and finally decline again with axial distance increasing. With radial distance increasing, electronic temperature increases to a stable area, then contitaues to rise, while electronic density decreases.