According to the frequency of the transmitting radar wave, it can be divided into high-frequency radar and low-frequency radar. According to the characteristics of the wave: velocity = wavelength * frequency, we can know that the microwave wavelength of 24 GHz high frequency is much shorter than the wavelength of radar wave in other frequency bands. In general, the shape of the solid surface is sloping and rough, and the smaller wavelengths provide maximum assurance that the transmitted radar waves can be reflected back to the radar probe to the utmost extent on the rough solid surface. Therefore, high-frequency radar is mainly used in the measurement of solid media and large-scale applications. Low-frequency radar emission microwave frequency 100MHZ ~ 6MHZ, mainly used in liquid medium and small-scale measurement occasions.
Compared with low-frequency radars, HF radars have the following advantages:
1) High-frequency radar level gauges ( mainly 26 GHz and 24 GHz) have high energy and small beam angles (generally Φ95 horn antennas have a beam angle of 8o, while 6GHz LF radar horn antennas have a diameter of Φ246, the beam angle is 15o), small antenna size, high precision.
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, and most of the bulk The material diameter is much less than 50mm, which is why the current 26GHz radar is the best choice for bulk material level measurement.
3) In some canisters with small diameter and short height, the 6GHz radar antenna length (300-400mm) increases the blind area (about 600mm) invisible. Because the 6GHz radar has poor directionality (large opening angle), it will produce in small cans. Multi-path reflection; 26GHz radar frequency high frequency, short antenna, good directionality, overcome the shortcomings of 6GHz radar, suitable for small tank measurement.
4) Due to the harsh on-site environment, the radar antenna will accumulate dirt, water vapor, etc. over time, the 26GHz radar level gauge antenna is small, and adding a radome can greatly improve the influence of dirt and water vapor; 6GHz radar antenna is large, plus a radome Very difficult. And the instrument is heavy and difficult to clean.
5) Because of the good directionality of the 26GHz radar level gauge, many harsh operating conditions can be measured by simply isolating the radar outside the container.
6) The limit range of high-frequency radar level gauge can reach 70 meters, and the limit range of low-frequency radar level gauge is 35 meters. For some users who need high measurement range, high-frequency radar level gauge is definitely the first choice. .
At present, the price of the 26GHz radar level gauge is already at a price comparable to that of the 6GHz radar level gauge, which further promotes the application of the 26GHz radar level gauge. It can be predicted that the market share of the 6GHz radar level gauge will be greatly reduced. As technology advances, we expect the availability of higher-frequency (eg, 90 GHz), smaller-angle (eg, 2°, 3°), and smaller-footprint radar level gauges. Tiankang Radar Level Meter will keep pace with the times and follow the development of the times.
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