Development of ultrasonic velocity profile method for multi-phase flow using liquid-gas separation technique based on the nonlinear reflected signal

利用超声波脉冲发生器/接收器、高速数字化仪和PC机研制了一套超声波速度剖面仪系统。该系统可准确测量单相流的速度分布。结果表明，利用界面反射信号的相位变化来识别气液界面是可行的。该系统可以与高速摄像机同步，并表明，通过使用开发的系统可以测量气泡周围的液体速度分布。

A system of ultrasonic velocity profiler was developed by using an ultrasonic pulser/receiver, a high-speed digitizer and a PC. Velocity distributions in single-phase flow could be measured accurately by using the system. It was shown that the identification of liquid-gas interface was possible based on the phase change of the reflected signal on the interface. The system could be synchronized with a high-speed camera, and it was shown that the liquid velocity distributions around a bubble could be measured by using the developed system.