The advantages of high frequency radar level meter in material level measurement

The high-frequency radar level meter has the characteristics of good directionality, small emission angle, and strong anti-interference ability, which determines that it is very suitable for the measurement of the material level of the silo with a relatively large length and diameter. In solid level measurement, compared with low-frequency radar, high-frequency radar has the following advantages: high-frequency radar level gauge (mainly refers to 26GHz and 24GHz) has high energy and small beam angle - such as the beam angle of a horn antenna of Φ95 It is 8o, when Φ123, ​​the emission angle is 6°, when Φ246 (generally a paraboloid), the emission angle is 4°, and the antenna size is small and high. The low-frequency radar has poor directivity due to low energy, energy dispersion, and large launch angle. When the diameter of the horn antenna of the low-frequency pulse radar is Φ246, the beam angle is only 15o. When the frequency is fixed, the larger the antenna size, the smaller the emission angle. Second, the wavelength of 26GHz radar is 11mm, and the wavelength of 6GHz radar is 50mm. When the radar measures the bulk material level, the radar wave reflection mainly comes from the diffuse reflection of the material surface. The intensity of the diffuse reflection is proportional to the particle size of the material and inversely proportional to the wavelength, that is, for the same The shorter the wavelength is, the easier it is to be reflected, so the echo signal during radar measurement is better. Under normal circumstances, the straight diameter of most bulk materials is far less than 50mm, so it is an ideal solution to choose 26GHz radar for level measurement. Third, the 26GHz radar antenna is small, and the additional radome can greatly reduce the influence of dirt and water vapor on the measurement results. The low-frequency 6GHz radar antenna is large, and it is difficult to add a radome. The instrument is bulky and difficult to clean. Fourth, when low-frequency radar (6GHz) measures solid materials, the measurement range cannot exceed 30m, and the general measurement range of high-frequency radar can reach 70 meters or even 100 meters, which can meet the application needs of mass production. Fifth, because the high-frequency radar level meter has the characteristics of good directionality, small emission angle, and strong anti-interference ability, it is determined that it is very suitable for the measurement of the material level of the silo with a relatively large length and diameter, especially the level of calcium carbide furnaces. Converter silos, etc., and in these occasions, low-frequency radars are generally difficult to meet the measurement needs. Sixth, low-frequency radar is not as capable of fighting dust as high-frequency radar due to its low frequency, scattered energy, and insufficient energy concentration.

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