热层氦辐射线大气吸收系数的理论分析  

Theoretical analysis of the atmospheric absorption coefficient of He emission line in thermosphere

作　　者：贺健[1] 张庆国[1] 

机构地区：[1]河南科技大学物理与工程学院,洛阳471023

出　　处：《激光技术》2011年第2期268-271,共4页Laser Technology

基　　金：河南省教育厅自然科学研究计划资助项目(2008B140005;2010B140004)

摘　　要：为了实现激光雷达对热层氦浓度的探测,采用理论分析和计算机模拟的方法,计算了组成亚稳态氦1083nm的3条共振辐射线的大气吸收系数,得到了大气吸收系数的数量级为10^(-3)。结果表明,对于同一光谱线,大气吸收系数与原子浓度成正比,与温度的1/4次方成正比,而与压强成反比;对不同光谱线,大气吸收系数与中心波长成正比;在谱线半宽度内,平均大气吸收系数和谱线中心大气吸收系数成正比。最后指出了大气吸收系数在光谱分析中的应用。此分析讨论对于激光雷达对热层氦浓度的探测具有一定的参考意义。In order to detect the helium density in thermosphere with a laser radar, after theoretical analysis and computer simulation, the atmospheric absorption coefficients for the three resonance lines making up metastable He 1083nm emission line were calculated, and the atmospheric absorption coefficient was found at the order of magnitude of 10-3. The resuhs show that for the same spectral line, the atmospheric absorption coefficient is proportional to the concentrate of atoms and the fourth root of the temperature, however it is inversely proportional to the pressure. For different spectral lines, the atmospheric absorption coefficients are proportional to the central wave length. In the half width of the spectral line, the average atmospheric absorption coefficient is proportional to the atmospheric absorption coefficient at the line center. Finally, the application of atmospheric absorption coefficient in spectrum analysis was pointed out. This calculation has some reference significance to realize the detection of the helium density in thermosphere.

关 键 词：大气与海洋光学 亚稳态氦 激光雷达 大气吸收系数 光谱分析 

分 类 号：P412.25[天文地球—大气科学及气象学]