Flat radar water level gauge for open channel water level monitoring Click here for details

Description :

　　Distance measurement principle of radar level gauge

　　The radar level gauge emits modulated electromagnetic waves to the liquid surface, and the reflected echo signal from the liquid surface is received by the radar and mixed with the transmitted signal. The frequency of the resulting difference frequency signal is proportional to the distance from the liquid surface. A high-precision signal processing algorithm combining Zoom FFT and energy center of gravity correction algorithm is proposed for the application of millimeter wave radar level gauges. Zoom FFT is used for spectral refinement with a small refinement factor, and the energy center of gravity correction algorithm is used to accurately estimate the frequency of the difference frequency signal. This algorithm eliminates the influence of FFT fence effect on ranging accuracy, and the computational complexity and storage space are relatively reasonable The simulation results show that when the signal-to-noise ratio of the difference frequency signal is 12dB, the algorithm controls the root mean square error of the distance measurement to the millimeter level.

　　Advantages and Applications of Radar Water Level Gauge

　　1. Radar level gauges can measure liquid and solid media such as slurries, raw coal, pulverized coal, volatile liquids, etc;

　　2. It can measure all media with a constant greater than 1.2 in vacuum, with a measurement range of up to 70m;

　　3. The power supply and output signal are transmitted through a two core cable (loop circuit), using 4-20mA output or digital signal output;

　　4. Non contact measurement installation is convenient and uses extremely stable materials that are sturdy and durable, with a reliable resolution of up to 1mm;

　　5. Not affected by working conditions such as noise, steam, dust, vacuum, etc;

　　6. Not affected by changes in medium density and temperature, the process pressure can reach 400 bar, and the medium temperature can reach -200 ℃ to 800 ℃;

　　7. There are multiple installation methods to choose from: top installation, side installation, bypass pipe installation, waveguide pipe installation;

　　8. Debugging can be done in multiple ways: using programming modules for debugging (equivalent to an analytical processing instrument), SOFT software debugging, and HART handheld programmer debugging, making debugging convenient and fast.

　　When purchasing a radar level gauge, it is crucial to consider which factors to choose based on. The purpose of using a radar level gauge product is to obtain a reflected wave on the surface of the measured material, but at the same time, there is no other interference or the interference wave is small. Based on its purpose, two conclusions can be drawn: one is the impact of the environment on the transmission path of electromagnetic waves; The second is the influence of the state of the measured material surface on the reflected signal.

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• Flat radar water level gauge