Development of Detection of Molecular Velocity and Pressure by Laser Induced Fluorescence

研究了诱导荧光非侵入性检测速度和压力的方法，利用荧光强度与速度的关系来检测气体分子的速度，荧光强度与分子吸收线形与入射激光波长的相对位置有关。在分子运动时，由于多普勒效应，吸收线和入射激光波长的相对位置发生变化，通过数值模拟和实验验证了荧光强度与速度的关系，并利用紫外光(近190 nm)激发的碘分子的荧光进行压力检测。实验关联了荧光强度与压力的关系，并对测量方法的有效性进行了考察。对荧光强度随压力变化的机理进行了讨论。

Detection of velocity and pressure by non-intrusive method using induced fluorescence were investigated.Velocity of gaseous molecules was detected using the relation between the fluorescence intensity and the velocity.Fluorescence intensity is related by the ralative position between the absorption line shape of the molecules and the incident laser light wave length. When the molecules are moving, the relative position of the absorption line and the incident laser light wave length is changed due to the Doppler effect.Numerical simulation of the relation between fluorescence intensity and velocity, and the experimental verification were conducted to investigate the validity of the measureing method.Pressure detection was conducted by use of the fluorescence from iodine molecules excited by the UV light source(near 190nm). The relation between fluorescence intensity and pressure was correlated experimentally and the validity of the measureing method was investigated. The mechanism of the pressure dependence of the fluorescence intensity was discussed.