Advantages of Guided Wave Radar Level Gauge

The guided wave radar level gauge uses a waveguide to transmit electromagnetic energy, has all the performance of the pulse radar level gauge, and has the following unique advantages (1) low energy consumption. The signal energy output by the GWR to the waveguide probe is very small, about 10% of the energy emitted by conventional radar (1mW). This is because the waveguide provides a fast and efficient channel for the round-trip transmission of the signal to the liquid level, and the attenuation of the signal is kept to a minimum, so it can be used to measure the liquid level of the medium with a very low dielectric constant; in addition, due to the small energy consumption of the guided wave radar, No separate AC power supply is required. (2) Since the transmission of the signal in the waveguide is not affected by the fluctuation of the liquid level and the obstacles in the storage tank, the energy of the return signal received by the instrument is correspondingly strong, about 20% of the transmitted energy, and the return signal is relatively strong. The interfering stray signal in the signal is very small and basically has no effect on the measurement signal. (3) The change of the dielectric constant of the medium has no obvious effect on the measurement performance. The guided wave radar, like the pulse radar, uses the transmission time to measure the liquid level of the medium. The time for the signal to reflect from the liquid surface and return is the same. Difference, pulse radar needs to consider the influence of the medium, it is difficult to identify the various signals returned, and detect the real liquid level signal from the stray signal, while the guided wave radar only needs to measure the transmission time of the electromagnetic wave, without signal processing and distinguish. (4) The change of the medium density has no effect on the measurement. The change of the medium density affects the buoyancy of the object immersed in the medium, but does not affect the propagation of electromagnetic waves in the waveguide. (5) Fog and foam have no effect on the measurement. Since electromagnetic waves do not propagate through space, fog will not cause signal attenuation, and foam will not scatter the signal and lose energy. (6) The deposition and smearing of the medium has little influence on the liquid level measurement. The influence of the smear of the medium on the probe on the measured liquid level can be divided into two types: film smear and bridging. Membrane smear is when the liquid level is lowered, a highly viscous liquid or light oil slurry forms a coating on the probe. Since this smear is uniformly coated on the probe, it basically has no effect on the measurement; however, the formation of bridging smears can lead to significant measurement errors. Between the two waveguides, a false level is measured at this point.
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