Working Principle of Dayu Electronic Ultrasonic Doppler Flowmeter

Dayu ElectronicUltrasonic Doppler Flowmeter features a simple structure, non-contact measurement, and easy integration, offering broad application prospects in industrial production, agricultural irrigation, hydrological and environmental monitoring, and other fields. Ultrasound is a type of mechanical wave with a very short wavelength, typically with a frequency above 20KHz. Due to its high frequency, it can concentrate more energy, has strong penetration, and long transmission distance, making it widely used in river flow measurement and other applications. So, what is the working principle of the ultrasonic Doppler flowmeter?

In fact, the principle of the ultrasonic Doppler flowmeter is as follows: the sensor consists of two transducers, one for transmitting and one for receiving. When the sensor is facing the direction of water flow, i.e., measuring against the flow: when the water is stationary, the received frequency is the same as the transmitted frequency. The faster the flow velocity, the higher the frequency received by the receiving sensor, which will be higher than the transmitted frequency. The slower the flow velocity, the lower the frequency received, but it will still be higher than the transmitted frequency.

When the sensor is measuring in the direction of the water flow: when the water is stationary, the received frequency is the same as the transmitted frequency. The faster the flow velocity, the higher the frequency received, but it will be lower than the transmitted frequency. The slower the flow velocity, the lower the frequency received, but it will still be lower than the transmitted frequency.

From the above, the flow velocity and flow direction can be calculated through hardware and software. During installation and use, the sensor must face the direction of water flow. This is similar to the principle of the transit-time flowmeter, where one uses frequency difference and the other uses time difference.