Split guided wave radar liquid level gauge based on gated frequency modulated continuous wave

Abstract

The present disclosure provides a split-type guided wave radar liquid level gauge based on gated frequency-modulated continuous wave, comprising: an electronic unit, which is arranged outside the container of the liquid level to be measured, and is used for generating a transmission signal; a coaxial cable, connected with the The electronic unit is connected to transmit the emission signal to a coaxial probe arranged in the container of the liquid level to be measured; the coaxial probe generates an echo signal based on the principle of frequency domain reflection and returns to the Electronic unit, and then obtain the height information of the liquid level to be measured. It can realize the remote installation of electronics and radar probes, and the electronics are far away from the high temperature, high pressure and high irradiation container, which improves the reliability of the equipment; in low-frequency applications, it is easy to achieve a larger system bandwidth, improve the measurement accuracy, and at the same time, it is conducive to the miniaturization of equipment; The gated switch is used to control the transmit and receive channels, which achieves a larger system transceiver isolation; the high-pass filter is used to effectively suppress the direct wave signal, which can prevent the saturation of the intermediate frequency amplifier.

Description

technical field [0001] The present disclosure relates to the technical field of measurement, and in particular, to a split-type guided wave radar liquid level gauge based on a gated frequency-modulated continuous wave. Background technique [0002] At present, the water level of high-temperature and high-pressure vessels on nuclear power plants, such as voltage stabilizers and steam generators, are measured by contact using the pressure principle. Affected by the working conditions of the load in the vessel, the differential pressure water level measurement has low accuracy and low reliability. However, other contact liquid level measurement such as manual gauge and floating body also have disadvantages such as large workload, large operation error, 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, ...

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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