High-frequency radar is currently the mainstream product for measuring solids in the world, such as: VEGA's VEGAPULS67/68 (26GHz); E+H's FMR250 (26GHz); SIEMENS's LR260 (26GHz), LR400/460 (24GHz), Beijing Guda Instrument Co., Ltd. GDRD58 (26GHz).
When measuring solids levels, HF radars have the following advantages over low-frequency radars:
1) High-frequency radar level gauges (mainly 26 GHz and 24 GHz) have high energy and small beam angle (generally Φ95 horn antennas have a beam angle of 8o, and ¢123, an emission angle of 6 ¢ 246 (usually parabolic). When the launch angle is 4°, the antenna has the advantages of small size and high precision, while the low-frequency radar has low energy and dispersive energy, and all the transmission angles are large and the directivity is poor, and when the diameter of the horn antenna of the low-frequency pulse radar is Φ246, the beam angle is also only 15o). (Note: At a fixed frequency, the larger the antenna size, the smaller the emission angle).
2) 26GHz radar wavelength 11mm, 6GHz radar wavelength 50mm, radar measurement of bulk material, the radar wave reflection mainly from the diffuse reflection of the material plane, the intensity of diffuse reflection is proportional to the size of the material, inversely proportional to the wavelength, ie for the same material The shorter the wavelength, the easier it is to reflect, so that the radar signal will be better when measured. (For example, when the basket asks for a ping pong ball, the basketball will not bounce back. When the table tennis ball hits the ball, the ping pong ball will be bounced back.) Most of the bulk material will pass through far less than 50mm, which is why 26GHz radar is the best choice for bulk material level measurement.
3) Due to the harsh on-site environment, the radar antenna will accumulate dirt, water vapor, etc., and the 26GHz radar antenna will be small over time. Adding a radome can greatly improve the effects of dirt and water vapor. The 6GHz radar antenna is large and it is difficult to add a radome. The overall size of the instrument is too great to clean up.
4) In the solid-state measurement of low-frequency radar (6GHz), the measurement range will not exceed 30m (such as VEGA's PULS54/66; E+H's FMR230, etc.), and also the measurement range of 6GHz low-frequency radar produced by domestic manufacturers when measuring solids Not more than 30 meters, unable to meet all the level measurement of cement lines above 2500T/d; and high frequency radars can reach a measurement range of 70 meters or even 100 meters, which can fully meet all the current cement production lines of all sizes. Silo.
5) Because high-frequency radar level gauges have good directionality, small emission angle, and strong anti-interference ability, it is very suitable for the measurement of large-diameter ratio silos, especially in the case of calcium carbide charge, converter silos Level measurements, such as these, cannot be measured with low-frequency radars on these occasions.
6) Compared with high-frequency radars, low-frequency radars have far less frequency, energy dispersion, and insufficient energy concentration. Therefore, the ability to combat dust is far inferior to that of high-frequency radars.
The above reasons determine that high-frequency radar is the mainstream product for solid material level measurement.
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