Features of Radar Level Gauge

The characteristics of radar level gauge The physical characteristics of electromagnetic waves are similar to visible light, and the transmission speed is equivalent to the speed of light. Its frequency is 300MHz-3000GHz. Electromagnetic waves can penetrate interfering sources such as space steam and dust, and are easily reflected when encountering obstacles. The better the conductivity of the measured medium or the greater the dielectric constant, the better the reflection effect of the echo signal. Therefore, the radar level gauge uses the special properties of electromagnetic waves to detect material level. Radar level measurement principle and main technical elements: Radar level gauge uses the principle of echo ranging. The transmitting antenna transmits microwaves to the target under test, and the microwave of the target under test is received by the receiving antenna. The signal processor compares the transmitted signal with the received signal, and calculates the measured distance. Because the microwave has attenuation and interference reflection on the transmission path, the measurement The key is to be able to receive reflected echoes and identify useful echoes. The echo energy received is related to the transmitting and receiving power of the antenna and the radiation power of the antenna, so the antenna design and shape of the radar level gauge are very important. In addition to the horn antenna (horn mouth) and the rod antenna, the existing antennas also have Planar antennas and parabolic antennas are used for materials with a small dielectric constant. The cables are used as antennas or waveguide devices. The cables and waveguides extend all the way to the bottom of the warehouse or warehouse, thereby transmitting and receiving electromagnetic waves. Enhanced echo signal. The amount of echo energy received is related to the dielectric properties of the material surface. If the dielectric constant ε is low, the material will absorb some microwave energy, and the echo intensity is also low; if the dielectric constant ε is high, the reflectivity is high, and the echo obtained Strength is also high. General requirements The dielectric constant ε of the material to be tested: cement plant solid ε>2.5, the dielectric constant ε of cement is 3, and that of liquid is ε>1.8, solid ε>2.5.

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