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# Concept and characteristics of FM continuous wave radar level meter

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# Concept and characteristics of FM continuous wave radar level meter

2024-02-17

Frequency Modulated Continuous Wave (FMCW) radar level meter has been more and more widely used in municipal, electric power, chemical, petrochemical, metallurgy, food processing and other industries because of its high accuracy, easy installation and maintenance, non-contact and other advantages.

The transmitting frequency of the FMCW radar level meter is an equal-amplitude adjustable frequency. By measuring the frequency difference between the transmitting wave and the reflected wave, the frequency difference can be converted into an electrical signal that is proportional to the measured level. A continuous wave radar level meter transmits a continuous microwave signal through a lens antenna, and the frequency of this transmitted signal is linearly modulated by a sawtooth wave. When the continuously emitted microwave signal encounters the surface of the measured medium, part of the energy of the microwave signal is continuously reflected back due to a sudden change in the dielectric constant and is received by the lens antenna system.

There is always a difference between the frequency of the received signal and the frequency of the transmitted signal, and this difference is proportional to the distance from the radar antenna to the surface of the measured medium, with a larger frequency difference representing a greater distance to the liquid level.

By the formula D = 1/2 × c × (F/R). Where D is the distance from the measuring reference surface to the measured medium; c is the propagation speed of light (electromagnetic wave) in vacuum; F is the frequency difference between the received signal and the emitted signal; R is the rate of change of the emitted signal frequency with time. Then according to the empty liquid level position set by the user, the liquid level height can be calculated by the formula L=E-D. Where E is the measurement reference surface to the user-set empty liquid level position; D is the distance from the measurement reference surface to the measured medium; L is the liquid level height.

FM Continuous Wave FMCW Radar Level Gauge features are as follows:

(1) High precision, four-wire technology, an alternative to differential pressure, magnetostrictive, radio frequency conductivity, magnetic flap and other level instruments.

(2) Less affected by pressure change, vacuum, temperature change, inert gas, smoke, steam and other environmental impact, stable and reliable measurement results.

(3) Easy installation, firm and durable, maintenance-free.

(4) Sensitive measurement, fast refresh speed.

(5) The graphic dot-matrix LCD of the instrument supports complex operations such as on-site waveform display and establishment of false echoes, which reduces the difficulty of instrument operation and maintenance workload.

(6) The instrument is preset with Chinese and English menus, which further reduces the difficulty of instrument debugging.

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