Principles of flow field diagnostics by laser-induced biacetyl phosphorescence

A new method for measuring the density, temperature and velocity of N2 gas flow by laser induced biacetyl phosphorescence is proposed. The characteristics of the laser induced phosphorescence of biacetyl mixed with N2 are investigated both in static gas and in one-dimensional flow along a pipe with constant cross section. The theoretical and experimental investigations show that the temperature and density of N2 gas flow could be measured by observing the phosphorescence lifetime and initial intensity of biacetyl triplet (3Au) respectively. The velocity could be measured by observing the time-of-flight of the phosphorescent gas after pulsed laser excitation. The prospect of this method is also discussed

流动介质中的激光诱导荧光

为将激光诱导荧光现象应用于流体,首先要研究流体中存在的各种现象如流动、扩散等 对激光诱导荧光信号的影响,同时考虑流动、扩散、光激发及衰减四种效应时荧光跃迁上能级粒子数密度N应服从方

Biacetye的激光诱导磷光特性及其在流场测量中的应用

本文报导了我们对Biacetye 3An态磷光特性的实验结果及理论解释并讨论了用Biacetye来测量流体速度、密度与温度分布的前景

Ar原子光电流效应的研究

在十种染料波长范围内对应阴极放电中Ar原子光电流谱进行了观察,比较了Ar与Ne光电流效应的异同,提出了理论模型,并求得了放电电流与激光功率关系

用丁二酮激光诱导磷光测量流场可能性的研究

对混合在氮气中丁二酮三重态~3Au的激光诱导磷光性质的实验结果表明,磷光寿命是温度的函数,与密度及浓度无关;而初始磷光强度是密度的线性函数,对温度变化不敏感,用观察氮气中少量丁二酮磷光寿命与磷光初始强度的方法可以测量流场的温度与密度分布,磷光寿命长的特点可以用来测量速度分布,它在很大程度上克服了多普勒测速中因固体微粒质量大而滞后于气流的问题,因而可以在具有高加速度的流场中使用,本文还对磷光衰减机理进行了分析,结果与实验一致,上述同时测温度与密度的方法尚未见诸文献报道