Method and apparatus for measuring the level of a fluent materia

Details Method and apparatus for measuring the level of a fluent materia Method and apparatus for measuring the level of a fluent materia

1985-04-22

1987-02-03

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

Material level within container

73290R, G01S 1308

Patent

active

046411399

ABSTRACT:
In a method of measuring the level of a flowing material kept in a container there is employed a microwave signal that is fed from a transmitter through a tubular waveguide (7) that extends vertically downwardly through the container and communicates therewith so that the surface (10) of the material in the waveguide follows the level of the surrounding material. The signal is reflected from the surface back up through the waveguide and is conducted to a receiver to be employed, after signal processing in an electronic unit, for determining the level of material in the container. The microwave signal is fed to the waveguide by way of a mode generator (11) that produces only one dominant propagation mode of the signal, the wavelength of which is smaller than the diameter of the waveguide (7).

REFERENCES:
patent: 4359902 (1982-11-01), Lawless
patent: 4489601 (1984-12-01), Rao et al.
patent: 4503433 (1985-03-01), Tomasi
patent: 4566321 (1986-01-01), Zacchio

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