超声波流量计的全数字式准确计时方法

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

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。

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.