介绍了一种命名为吸收光谱测温法的方法,结合激光束气体吸收理论,对HF/DF化学激光器热平衡流场的吸收系数与温度关系进行了理论分析。利用电激励连续波选线HF激光器的1p9,1p8两条单谱线作为探测光源,实验测量了一台电激励连续波HF/DF化学激光器增益区下游流场的透射率随注入氢气流量变化的曲线,推测出HF气体流量,并结合流场压强等其他数据,通过吸收系数公式计算出加入过量氢气后流场的温度变化范围。对计算结果及误差来源进行了分析。该方法可用于气流激光器、发动机燃烧室等的气体流场温度测量。

This article introduced a method of measuring temperature which was named absorption spectrum temperature-measurement method;the relationship between the absorption coefficient and the temperature of thermal equilibrium flow field for HF/DF chemical laser was analyzed by the theory of gas absorption. Used the 1p9 and 1p8 spectral line of a discharge driving continuous wave (CW) single-line HF laser as detect light source,the transmittance of the flow field that behind the gain field of a discharge driving CW HF/DF laser was experimental measured,which changed with the flow rate of injected hydrogen gas. The flow rate of HF gas was estimated,combined with the pressure of flow field and other data,the temperature variety scope of the flow field was computed by the absorption coefficient formula. The result and error source were analyzed. This method can be used for measuring gas flow field temperature of gas flow laser and engine combustor.