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。利用该系统可以准确测量单相流中的速度分布。结果表明，利用界面反射信号的相变特征进行气液界面识别是可能的。该系统可与高速摄像机同步，并可用于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.