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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。
A method named Absorption Spectrophotometry is introduced, and the relationship between absorption coefficient and temperature of the heat balance flow field of HF / DF chemical laser is theoretically analyzed based on the theory of laser beam gas absorption. Using the 1p9 and 1p8 two single lines of the HF laser as the detection light source, the curves of the transmittance of the flow field downstream of the gain region of an electro-excited continuous wave HF / DF chemical laser with the injected hydrogen flow rate were experimentally measured The flow rate of HF gas was deduced. Combined with the other data such as the pressure of flow field, the temperature range of flow field after adding excess hydrogen gas was calculated by the absorption coefficient formula. The calculation results and the sources of error were analyzed. This method can be used for gas flow field temperature measurement of air-jet lasers, engine combustors, and the like.