基于法布里-珀罗干涉仪的干涉瑞利散射测速技术原理,结合种子注入Nd∶YAG脉冲激光器、ICCD相机和高光谱分辨法布里-珀罗干涉仪, 建立了一套干涉瑞利散射速度测量系统, 系统的速度测量准确度为10 m/s.对拉瓦尔喷管产生的超声速自由射流开展干涉瑞利散射速度测量, 得到气流的流动速度为366 m/s.在不需要外加任何示踪粒子的条件下, 利用流场气体分子本身的瑞利散射, 实现了对超声速流场速度的非接触测量.

The working principles of Interferometric Rayleigh scattering velocimetry using a Fabry-perot interferometer is presented. An interferometric Rayleigh scattering velocimetry apparatus consisted of a high resolution F-P interferometer, an injection-seeded Nd∶YAG laser and an intensified CCD was developed. In theory, the measurement uncertainty of velocity is 10 m/s, the recommendations for system improvements were given. Non-intrusive measurement of velocity in unseeded gas flow is performed to demonstrate this technique, flow velocity of 366 m/s was obtained in a supersonic free air jet flow.