Measurement method
The BLE Radar uses a pulsed, coherent radar that operates in the millimetre wave range.
"Pulsed" means that the BLE Radar emits a carrier wave for a short period of time. These signals are reflected by objects. The distance to the object can be calculated from the time difference between the emission of the signal and the reception of the reflected signal.
"Coherent" means that the reflected signal contains both amplitude and phase information. This allows even very small movements or speeds to be detected. "Coherent" also means that the start phase of the transmitted signal is known.
Advantages of radar technology
- Stable, reliable and extremely precise non-contact measurement of water levels and surface velocities
- Largely independent of the properties of the medium to be measured, such as temperature, viscosity, density or conductivity
- Insensitive to light conditions, fog and light rain; however, heavy rainfall significantly impairs measurement (see Framework conditions for a reliable measurement)
Water level measurement
The BLE Radar calculates the distance to the water surface based on the time difference between the transmission of the signal and the reception of the reflected signal. A smooth and even water surface improves the measurement accuracy. The water level is then calculated based on the determined distance, taking into account the configurable mounting height and the configurable trim (zero point adjustment).
