Ultrasonic Water Flowmeter Sensor

Principle classification of measuring water flow
The principle of measuring the water flow by the time difference method,at a certain distance upstream and downstream of the measuring pipeline, two pairs of ultrasonic transmitting and receiving probes (F1, T1) and (F2, T2) are installed respectively, wherein the ultrasonic waves of F1 and T1 are propagated downstream. The ultrasonic waves of F2 and T2 propagate countercurrent. Due to the difference in the propagation speed of the two ultrasonic waves in the liquid, ultrasonic flowmeter transducer is measuring the time difference Dt of the ultrasonic wave propagation on the two receiving probes can obtain the average velocity and flow rate of the fluid.

Principle of measuring flow by frequency difference method:
 F1 and F2 are the same underwater ultrasonic flowmeter sensor , which are installed outside the wall of the tube. They are alternately used as ultrasonic transmitters and receivers under the control of electronic switches. First, the first ultrasonic pulse is emitted by F1, which is received by F2 through the tube wall, fluid, and the other side of the tube wall. This signal is amplified to trigger the drive circuit of F1 again, so that F1 emits the second acoustic pulse. Immediately , F2 transmits an ultrasonic pulse, and F1 is used as a receiver, and the pulse repetition frequency of F1 can be measured as f1. Similarly, the pulse repetition frequency of F2 can be measured as f2. The frequency difference between the downstream emission frequency f1 and the upstream emission frequency f 2 D f is proportional to the measuring flow velocity v of 1MHz ultrasonic flowmeter transducer.

Transmitting and receiving transducers can also be installed on the same side of the pipeline