The flow velocity sensor RG-30 has been designed for contact-free measurements of the surface flow velocity of rivers and channels. The sensor is mounted above the channel, there it radiates the radar signal inclined about 60° to the water surface. The reflected radar signals from the water surface are received, analyzed and converted into the average surface velocity.
Measurement flow velocity
The measurement of the flow velocity is based on the principle of the Doppler frequency shift. Due to the comparison of the radiated frequency and the reflected frequency from the water surface, the local flow velocity is determined.
Measurements in hard to reach areas
The choice of the measurement location determines the quality of a measurement. By simply mounting the sensor on bridges, ceilings of closed channels or any superstructures of the channel, now locations can be selected that were previously difficult to achieve. The most important criterias are the quality of the measuring point of the profile, the water surface and the flow conditions.
The stability of the profile is the determining factor in order to ensure a constant measurement. The water surface must neither be completely smooth nor extremely upset, but there should be a visible swell of the water surface. Stones, swirls, steps or standing waves should not be within the measuring area. Depending on the condition of the water surface, the maximum mounting height above the water surface is 130 m, but a minimum distance of 0.5 m should be maintained.