The invention discloses a
waveguide tube type
radar liquid level meter, and relates to the technical field of
radar measurement, the
waveguide tube type
radar liquid level meter comprises a casing body, the top of the casing body is provided with a casing upper cover, the lower part of the casing body is coaxially provided with a
flange plate, and the bottom end of the casing body is connected with a casing cavity penetrating through the inside of the
flange plate; a lens is arranged in the
machine shell cavity, and a conical horn is connected to the lower portion of the
machine shell cavity. According to the
waveguide tube type radar liquid level meter, a
microwave emitter emits frequency-modulated
waves, a waveguide tube guides the electromagnetic
waves to be rebroadcast towards the surface of a medium, and the electromagnetic
waves reflected by the surface of the medium are guided to a
receiver along the same path; the
receiver receives electromagnetic waves reflected by the surface of the measured medium, and the
signal processor processes echo signals; based on the time-frequency relation between the transmitting
signal and the receiving
signal, the distance between the liquid level meter and the surface of the measured medium is determined and converted into the liquid level; according to the scheme, false echoes can be automatically restrained, and
liquid level measurement is more accurate and more stable.