Signal-related knowledge of radar level gauge

The radar level meter can continuously measure different material levels, suitable for harsh environments such as high temperature, steam, high dust and volatile gas, and is widely used in energy, metallurgy, petrochemical, building materials and other industries. The radar level meter also has the advantages of signal processing, which and related factors are introduced in detail below. 1. After the radar level gauge is installed and put into use, the spatial surface conditions of the application are constantly changing. Taking the reaction tank as an example, the chemical process needs to measure a variety of media, and the liquid level will change during feeding, such as material adhesion, changes in the physical or chemical properties of the inner surface of the tank, etc. These changes will inevitably affect the reflection. the strength of the signal. 2. The liquid level measured by the radar level gauge also changes in many situations. Under different circumstances, the multiple reflections of the signal will change. For example, it is a mirror surface at rest; the surface will fluctuate when the liquid level changes; sometimes there may be foam. 3. When the height of the liquid level measured by the radar level gauge is different, the shape of its measurement space is constantly changing, and the reflection and oscillation of the signal are also different. Especially when the measured space has a curved surface, such as a spherical container, a vaulted tank or a horizontal elliptical tank, since the curved surface has a focusing effect on the electromagnetic wave, the height change of the liquid level has a greater impact on the reflection. 4. The medium at some application sites will also directly affect the radar wave emission and reception of the radar level gauge. On the one hand, it is reflected in the impact on the antenna: for example, steam condenses on the surface of the antenna, and materials crystallize on the surface of the antenna. On the other hand, the volatilization or atomization of the medium in the tank will also affect the propagation of radar waves, which in turn affects the measurement. 5. The application of radar level meter is often limited and narrow space, rather than open huge space. The signal emitted by the radar level meter is an electromagnetic wave. The electromagnetic wave spreads in space and has all the characteristics of the electromagnetic wave, such as reflection, diffraction, refraction, etc. Any object in the propagation space will produce a reflection of the signal. A small space will generate many reflection signals, including direct reflection signals from the surface of objects, as well as back and forth reflections and oscillations of signals (multiple reflections between surfaces).

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