氦辐射线吸收谱等效宽度的理论分析  

Theoretical analysis of the equivalent width of the helium emission lines′ absorption spectrum

作　　者：张庆国[1] 贺健[1] 尤景汉[1] 赵海丽[1] 张华桥[1] 

机构地区：[1]河南科技大学物理与工程学院,河南洛阳471023

出　　处：《激光与红外》2012年第4期372-376,共5页Laser & Infrared

基　　金：河南省教育厅自然科学研究计划项目(No.2010B140004)资助

摘　　要：为了实现激光雷达对热层氦浓度的探测,本文理论计算了高斯线型、洛伦兹线型及佛克脱线型下亚稳态氦1083 nm辐射线吸收谱的等效宽度,结果表明佛克脱线型包含其他展宽机制信息,是最接近实际的光谱线型;亚稳态氦1083 nm辐射线的等效宽度的数量级为10-4;在热层温度范围内,等效宽度随温度的变化近似成线性关系;且随着波长的减小,等效宽度会增大。对于388.9 nm和318.8 nm两条辐射线也进行了计算,得出的结论与上述结论相似。此计算对于实现激光雷达对热层氦浓度的探测具有一定的参考意义。For detecting the helium density in thermosphere with lidar,we calculated the equivalent width of the aborption spectrum of metastable He 1083 nm emission lines for Gaussia,Lorentzian and Voigtian profiles.Results show that the Voigtian profile contains the information of special broadening mechanics and it is most close to the actual broadened profile.The magnitude of the equivalent width of the He 1083 nm emission lines is about 10-4.Within the temperature range in thermosphere,the equivalent width shows approximate linear relationship with the temperature.The equivalent width increases with the decreasing of the wave length.We have also calculated the 388.9 nm and 318.8 nm emission lines and have gotten similar conclusions.This calculation is helpful in the detection of the helium density in thermosphere.

关 键 词：等离子体 亚稳态氦 等效宽度 光谱线型 

分 类 号：O433[机械工程—光学工程] O539[理学—光学]