Split-type guided wave radar liquid level meter based on gated frequency modulation continuous waves

Abstract

The invention provides a split-type guided wave radar liquid level meter based on gated frequency modulation continuous waves. The liquid level meter comprises an electronics unit which is disposed outside a container with a to-be-measured liquid level, and is used for generating a transmitting signal, a coaxial cable which is connected with the electronics unit and is used for transmitting the transmitting signal to a coaxial wave guide rod arranged in a container with the to-be-measured liquid level, and a coaxial wave guide rod which generates echo signals based on the frequency domain reflection principle and returns the echo signals to the electronics unit, and then acquires height information of theto-be-measured liquid level. Remote installation of electronics and radar probes can be realized, electronics are far away from a high-temperature, high-pressure and high-irradiation container, and the working reliability of equipment is improved; a relatively large system bandwidth is easy to realize in low-frequency application, the measurement precision is improved, and meanwhile, the miniaturization of equipment is facilitated; a gate controlled switch is adopted to control a transmitting channel and a receiving channel, so that relatively high system transmitting and receiving isolation is realized; and the high-pass filter is adopted to effectively suppress direct wave signals, and saturation of the intermediate-frequency amplifier can be prevented.

Description

technical field [0001] The present disclosure relates to the technical field of measurement, in particular to a split-type guided wave radar liquid level gauge based on gated frequency modulation continuous wave. Background technique [0002] At present, the water level of high-temperature and high-pressure vessels on nuclear power plants, such as pressurizers and steam generators, is measured by contact with the pressure principle. Due to the influence of the load conditions in the vessel, the differential pressure water level measurement has low accuracy and low reliability. However, other contact liquid level measurements such as manual measuring scale and floating body also have disadvantages such as heavy workload, large operating error and high risk factor, limited range, and serious aging. [0003] The electromagnetic wave emitted by the radar level gauge has a stable propagation speed in the same medium, and is not affected by temperature, density, dust, pressure, et...

AI Technical Summary

Problems solved by technology

Traditional radar level gauges mostly adopt an integrated structure, and the electronic unit is installed on the measured container, which cannot be applied in a strong radiation environment

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