Combined measurement of temperature and velocity of gas flow based on the luminescent lifetime

提出了一种流体流动中速度和温度分布的联合测量技术。粒子图像测速与基于寿命的标量测量技术相结合。该方法需要高速摄像机、单脉冲紫外激光器和温度敏感粒子。该方法适用于各种工质，温度范围广。温度和速度由常用图像估计。我们建立了发光材料的光学特性数据库，包括寿命、光谱和发射强度的温度依赖性。将所开发的技术应用于光发动机气缸内气体流动的温度和速度的测量。

A combined measurement technique of velocity and temperature distribution in a fluid flow was developed. Particle image velocimetry was combined with a lifetime based scalar measurement technique. Developed method needed a high speed camera, a single-pulsed UV laser and temperature sensitive particles. The method was applicable to any kinds of working fluids and to the wide range of temperature. The temperature and the velocity were estimated from common images. We built a database of optical properties of luminescent materials, such as temperature dependency of the lifetime, spectrum and emission intensity. The developed technique was applied to measure the temperature and velocity of the gas flow in the cylinder of the optical engine.