Lucht R P, Laurendeau N M, Sweeney D W
Purdue University, School of Mechanical Engineering, West Lafayette, Indiana 4790, USA.
Appl Opt. 1982 Oct 15;21(20):3729-35. doi: 10.1364/AO.21.003729.
A technique is proposed and demonstrated for measuring combustion temperatures using two-line laser-saturated fluorescence. The rotational temperature of OH is determined by saturating two different rotational transitions in the (0,0) band of the A(2)Sigma(+)-X(2)II electronic system and detecting fluorescence emission which originates from the laser-pumped upper rotational levels. Temperature is calculated from the ratio of the fluorescence intensities for the two different excitation-emission pairs. The method is demonstrated by measuring temperature profiles in subatmospheric H(2)/O(2)/Ar flat flames. Temperatures measured by two-line saturated fluorescence are compared with temperatures measured by coated thermocouples and OH absorption and with predictions from an elementary chemical kinetics code. The temperatures measured by the two-line fluorescence technique are accurate to 3-5% and exhibit low random error.
本文提出并演示了一种利用双谱线激光饱和荧光测量燃烧温度的技术。通过使A(2)Σ⁺-X(2)Π电子系统(0,0)带中的两个不同转动跃迁饱和，并检测源自激光泵浦的较高转动能级的荧光发射，来确定OH的转动温度。根据两种不同激发-发射对的荧光强度比来计算温度。通过测量亚大气压下H₂/O₂/Ar平面火焰中的温度分布来演示该方法。将双谱线饱和荧光测量的温度与涂层热电偶测量的温度、OH吸收测量的温度以及基本化学动力学代码的预测结果进行了比较。双谱线荧光技术测量的温度精度为3-5%，且随机误差较小。
