超声波流量计的全数字式准确计时方法

本文详细讨论了超声波流量计的测量与计时原理,采用两组高频脉冲序列计数以提高计时电路的分辨率,并通过电路实验测定了两组脉冲频率分别为2.1MHz和1.93MHz时,计时电路分辨率的大小。实验结果与理论计算完全相符。最后提出了一种新型的功能性强的超声波流量计实施方案。

Ultrasonic Flow Velocity Sensor Based on High Accuracy of the Digital Timing Method

in this paper, The measurement and principle of the digital timing method on the ultrasonic flow velocity sensor are investigated. The frequencies of the two oscillators(f_1=2.1MHz and F_2=1.93MHz)are very close together in the digital timing. So the timing becomes more accurate. A microprosessor-based digital flow-velocity measurement system is proposed, it's suitable for any kind of fluid.