玻耳兹曼和萨哈玻耳兹曼法测量Ti等离子体电子温度的实验研究

EXPERIMENTAL INVESTIGATION OF SAHA- BOLTZMANN AND BOLTZMANN METHODS TO CACULATE Ti PLASMA TEMPERATURE

电子温度是表征激光等离子体特性的主要特征参数，对等离子体电子温度的诊断可进一步深入理解等离子体内部的反应机制及其变化过程．激光诱导击穿光谱技术（LIBS）作为一种新型的等离子体诊断技术，可应用于等离子体各种性质的研究和参数的诊断．大气压环境下产生的等离子体一般被看作处于局域热平衡状态，可以用玻尔兹曼或萨哈玻尔兹曼法确定电子温度．笔者介绍了玻尔兹曼和萨哈玻尔兹曼确定电子温度的两种方法，通过对实验得到的Ti等离子体发射光谱分析，发现两种方法得到的电子温度往往存在差异，且在玻尔兹曼法中利用中性原子和离子得到的电子温度也往往不同，在文章中对这些差异进行了解释．

The electron temperature is one of the main characteristic parameters which describes laser induced plasma characteristics. Diagnosis of electron temperature can help to further understand the reaction mechanism and its process of change in the plasma. As an effective diagnostic technique, LIBS （Laser Induced Breakdown Spectrascopy） has been applied to a variety of diagnosis of properties and parameters of plasma. Bohzmann and Saha- Bohzmann methods can be used to determine the electron temperature because plasma generated in atmospheric pressure is generally considered to be in a local thermal equilibrium （LTE） state. This paper introduces the two methods and we obtained by analyzing the Ti plasma emission spectra. There are some differences between the electron temperatures by the two ways. Besides, the electron temperature is obtained by the Boltzmann method using neutral atoms＇ lines and ions＇ lines. The differences are also explained in this article.