How does Doppler radar flowmeter work? What is the principle behind non-contact flow measurement?
Doppler radar flowmeters use Doppler effect to measure water velocity via microwaves
A Doppler radar flowmeter operates based on the Doppler effect principle, transmitting microwave signals toward flowing water surfaces and analyzing the reflected signals to measure flow velocity. When radar waves encounter moving water or particles in the flow, the reflected wave frequency shifts proportionally to the water velocity.
The HZ-KSLF series multi-band Doppler radar flowmeter utilizes advanced FMCW (Frequency Modulated Continuous Wave) technology with the following process:
- Radar antenna transmits 24GHz or 10GHz microwave signals
- Signals create Doppler frequency shift when hitting flowing water
- Receiver captures reflected signals and analyzes frequency changes
- Advanced algorithms calculate surface velocity
- Flow rate computed by combining velocity and water level data
This technology enables true non-contact flow measurement with ±3% accuracy, perfect for open channel and river monitoring applications.
Doppler Radar Flowmeter