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The basic principle of radar level gauge

Radar wave is a special form of electromagnetic wave. Radar level gauge uses the special performance of electromagnetic wave to detect material level. The physical characteristics of electromagnetic waves of radar level gauges are similar to visible light, and the propagation speed is equivalent to the speed of light. Its frequency is 300MHz-3000GHz. Electromagnetic waves of radar level gauges can penetrate interference 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. The radar level gauge has a wide range of applications and can be used for continuous level measurement of oil storage tank farms, asphalt storage tanks, petroleum liquefied gas, reactors, sewage tanks in the petrochemical industry, and molten steel in blast furnaces in the steel industry. Radar level gauges are also widely used in winemaking, food industry, pharmaceutical industry and other fields. Radar level gauges are widely used in many fields such as petroleum, chemical industry, electric power, military industry, pharmaceuticals, metallurgy, food, papermaking, shipbuilding, environmental protection and scientific research experiments. It has opened up a wider range of applications, and also played an important role in the safety and stability of industrial production. The radar level gauge uses the principle of echo ranging. The transmitting antenna of the radar level gauge transmits microwaves to the measured target, and the microwaves of the measured target are received by the receiving antenna. The signal processor compares the transmitted signal with the received signal and calculates the measured distance. Since the microwave of the radar level gauge is on the propagation path There are attenuation and interference reflections, so the key to measurement is to be able to receive reflected echoes and identify effective echoes. Transmit-reflect-receive is the basic working principle of radar level gauge. The antenna of the radar sensor emits a minimum 5.8 GHz radar signal in the form of a beam. The reflected signal is still received by the antenna, and the running time of the KERD-800/900 series radar level gauge radar pulse signal from transmission to reception is proportional to the distance from the sensor to the surface of the medium and the level of the material.

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