激光陀螺中朗缪尔流形的研究

Research on Langmuir Flow Patterns in Laser Gyros

为了减小激光陀螺中朗缪尔流导致的误差,研究了在阴、阳极之间增加旁路管对放电管朗缪尔流的控制作用。采用气体辉光放电理论,通过改变旁路管半径、放电电流和气体压强,计算了多种情况下放电管的朗缪尔流形。结果表明,上述3个参量的改变都会导致朗缪尔流形的改变,更为重要的是,完全可以将放电管中基模截面上的平均朗缪尔流速调整为0。该发现很好地解释了激光陀螺相关研究中未能解释的一些实验现象,对减小激光陀螺中朗缪尔流零漂从而进一步降低激光陀螺的温度敏感性具有一定的意义。

In order to reduce errors cause by Langmuir flow in ring laser gyros, controlling effect of bypass tube between cathode and anode on the Langmuir flow in discharge tube is investigated. Langmuir flow patterns in discharge tube as a function of bypass tube radius, discharge current and gas pressure are simulated numerically with gas glow discharge theory. It is found that Langmuir flow pattern varies with the said parameters. What＇s more, average Langmuir flow across the fundamental mode section in discharge tube can be adjusted to zero. These foundings not only explain some experimental phenomena but also are useful in reducing Langmuir flow drift and consequently thermal sensitivity in ring laser gyros.