微腔放电中光谱法测量气体温度适用性分析  

Spectral measurement analysis of gas temperature in microcavity discharge

作　　者：夏广庆[1] 王冬雪[2] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [2]大连理工大学物理与光电工程学院,辽宁大连116024

出　　处：《实验室科学》2013年第5期19-21,共3页Laboratory Science

基　　金：国家自然科学基金资助项目(项目编号:11105023);大连理工大学研究生教学改革与研究基金资助项目(项目编号:JG1117)

摘　　要：针对微腔放电(MCD)装置,采用光学发射光谱的方法,通过在氩气中添加少量氮气,分析氮分子第一正带系和氮分子离子第一负带系测量了MCD中的气体温度。实验研究和理论分析表明,氮分子第一正带系测量的气体温度客观正确,而氮分子离子第一负带系测量的气体温度明显偏高,其原因是由于碰撞淬灭效应,N+2(B2∑+u)态的有效寿命与转动松弛时间相近,致使转动松弛不完全,转动能级的分布不是平衡态分布,因此所测量的转动温度不能合理体现气体温度。故采用光谱诊断法测量高气压下微等离子体气体温度时,利用氮分子第一正带系更准确合理。Microcavity discharge （MCD） is a type of micro-plasma driven by a direct-current source to efficiently generate stable glow plasma at high pressure. The gas temperatures were measured with e- mission spectroscopy diagnosis by analyzing the rotational structures of the N2 first positive and N~ first negative band system with traces of little nitrogen added in argon. Experimental results and theoretical analysis show that the gas temperatures obtained from the N2 band system are slightly above room tem- perature and are reasonable. But the gas temperatures obtained from the N~ band system are so higher. The effective lifetime of N^（ B2 E ^） is comparable to the rotational relaxation time at high pressure, thus the rotational temperature from N~ first negative band system cannot be evaluated as the correct gas temperature

关 键 词：微腔放电 转动温度 气体温度 光学发射光谱 

分 类 号：O561.3[理学—原子与分子物理]