The working principle and advantages and disadvantages of high frequency radar level meter

What is the principle of high frequency radar level meter? What are the advantages? High frequency radar level meter (mainly refers to 26GHz and 24GHz) has the characteristics of high energy, small beam angle and small antenna size, 2.26GHz radar wavelength 11mm, 6GHz radar wavelength 50mm, when the radar level meter measures the bulk material level, the radar The wave reflection mainly comes from the diffuse reflection of the material surface. The intensity of the diffuse reflection is proportional to the size of the material and inversely proportional to the wavelength. The diameter of most bulk materials is much smaller than 50mm, which is used for dust and disturbances within 50/100 meters. The silo in the feeding state. Capacitance or guided wave radar level gauges will be subjected to a strong tension load when the material level drops during discharge, which may damage the gauge or collapse the top of the bin. Heavy hammer level gauges often suffer from buried hammer problems and require frequent maintenance, as do most other mechanical gauges. High dust conditions may in turn exceed the capabilities of non-contact ultrasonic level measurement systems. Classification of high-frequency radar level gauges High-frequency radar level gauges can be divided into non-contact and contact types according to their working methods. The non-contact microwave level meter uses a horn or a rod antenna to transmit and receive microwaves. The instrument is installed on the top of the silo and does not contact the measured medium. The microwave propagates and returns in the upper space of the silo. Simple installation, low maintenance, and unaffected by gas composition, dust, temperature changes, etc. in the silo. Contact microwave level meters generally use metal waveguides (rods or steel cables) to conduct microwaves. The instrument is installed from the top of the warehouse, and the waveguide rods reach the bottom of the warehouse. The emitted microwaves propagate downward along the outside of the waveguide. When they reach the material surface It is reflected and returned to the transmitter along the waveguide to be received. Advantages and disadvantages of high-frequency radar level meter High-frequency radar works in the K-band (24 ~ 26GHz) radar level meter, the higher the operating frequency of the radar, the shorter the electromagnetic wave wavelength, the easier it is to have better reflection on inclined solid surfaces , and has a narrow beam width, which can effectively avoid obstacles, and the high frequency can also enable the radar to use a smaller antenna. The frequency-modulated continuous wave microwave level meter transmits and receives signals at the same time, and more microwave signals are transmitted in the same time, which can reduce the wave loss phenomenon in the measurement of high-dust solid silos in solid measurement. Therefore, the medium and high frequency FM radar for solid measurement can provide accurate and reliable measurement, and it is also well used in media such as PP powder and PE powder in the chemical industry.
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