摘要
激光诱导荧光（ＬＩＦ）法测量气体分子的温度，具有高时间分辨率和空间分辨率、灵敏度高、对被测对象不产生干扰等优点。设计了用该方法测量气体温度的一套实验装置。通过光纤传导，测量了激光诱导的碘饱和蒸气荧光在不同温度下的波形。证实了荧光信号按指数规律衰减，得到了不同温度下荧光衰减的时间常数。进而分析、处理，得到碘荧光的衰减时间常数和温度之间的经验公式。公式计算与实际测量的偏差最大不超过 １． ５５ ｎｓ。
A method of measuring gas temperature through laser-induced iodine gas fluorescence was studied. This method has the advantages of spatial and time resolution, and little disturbance with the measurement. Through the fibre transmission, the waveforms of iodine gas fluorescence in different temperatures were. measured. By analyzing the waveforms, the rule that the fluorescence intensity decays according to exponential law was proved. The decay lifetime of fluorescence was obtained by processing experimental data. The empirical formula between iodine fluorescence decay lifetime and iodine gas temperature was obtained through fitting. The largest difference between the lifetime calculated by the empirical formula and the measured value does not exceed 1. 55 ns.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1996年第6期40-43,共4页
Journal of Tsinghua University(Science and Technology)
关键词
温度
测量
光纤
激光荧光法
气体
laser-induced iodine fluorescence
decay lifetime
temperature measurement
fibre
