一、基本原理图1中流体在管道内静止时,振子 T_1发射的超声波脉冲在流体中传播,在经过一段时间 t 后被 T_2接收。先将这超声波脉冲变成电信号,再将放大后的输出信号加到振子 T_1上,随即发射下一个超声波脉冲。就这样,超声波脉冲和电脉冲轮流经过振子T_1→流体→振子 T_2→电路→振子 T_1所以这种方法 First, the basic principle In Figure 1, the fluid in the pipe when stationary, the oscillator T_1 ultrasonic pulse emitted in the fluid transmission, after a period of time after T 2 was received. First, the ultrasonic pulse into an electrical signal, and then the amplified output signal is added to the oscillator T_1, then transmit the next ultrasonic pulse. In this way, the ultrasonic pulse and the electric pulse pass through the transducer T_1 → fluid → transducer T_2 → circuit → transducer T_1. Therefore, this method