Lee M P, McMillin B K, Hanson R K
Appl Opt. 1993 Sep 20;32(27):5379-96. doi: 10.1364/AO.32.005379.
Two techniques based on planar laser-induced fluorescence of NO are applied to the measurement of two-dimensional temperature fields in gaseous flows. In the single-line technique, the NO fluorescence signal, which is in general a function of temperature, pressure, and mole fraction, can be reduced to a function of temperature alone. In this limit, a single measurement of fluorescence can be directly related to temperature. In contrast, in the two-line thermometry technique the ratio of fluorescence signals resulting from excitation of two different rovibronic states is related to the fractional populations in the initial states, which are solely a function of temperature. The one-line method is applied to the study of a laminar heated jet, and the two-line technique is used to measure temperature in a supersonic underexpanded jet. In addition, energy transfer in NO laser-induced fluorescence is analyzed with multilevel rate equation models. Finally, an accurate model is developed for prediction of the temperature dependence of the NO fluorescence signal.
基于一氧化氮平面激光诱导荧光的两种技术被应用于测量气流中的二维温度场。在单线技术中，一氧化氮荧光信号通常是温度、压力和摩尔分数的函数，可简化为仅与温度有关的函数。在此极限下，单次荧光测量可直接与温度相关。相比之下，在双线测温技术中，由两种不同振转电子态激发产生的荧光信号之比与初始态的分数布居有关，而初始态分数布居仅是温度的函数。单线法用于研究层流加热射流，双线技术用于测量超声速欠膨胀射流中的温度。此外，用多能级速率方程模型分析了一氧化氮激光诱导荧光中的能量转移。最后，建立了一个精确模型来预测一氧化氮荧光信号的温度依赖性。
