Economical non-contact radar water level sensor with plastic housing, small size, light weight, 1mm high accuracy, which is easy to install and simple maintenance.
Principle of the radar water level sensor
The general principle of the FM continuous wave radar level gauge is that the radar emits electromagnetic waves at the top of the tank. The electromagnetic waves are received by the radar after hitting the medium and being reflected. The frequency difference δf between the received signal and the transmitted signal is proportional to the distance R from the surface of the medium: R=C(speed)*δf(frequency difference)/2/K(frequency modulation slope). Because the speed of light C and the frequency modulation slope K are known, the frequency difference δf can be estimated to obtain the distance R from the material surface at the radar installation position. Then, the spatial distance from the radar to the material surface is subtracted from the known total height of the tank body (referred to as empty height) to obtain the height of the material level.
