Liquid level gauge

Details Liquid level gauge Liquid level gauge

1980-07-31

1982-11-23

Howell, Kyle L.

Measuring and testing

Liquid level or depth gauge

343 14, G01F 2328

Patent

active

043599028

ABSTRACT:
An apparatus and method for using microwaves to measure the level of liquid within a container comprising a waveguide for immersion into the liquid, an oscillating means for propagating a sweeping frequency electromagnetic signal down the waveguide for reflection from the surface of the liquid, impedance matched means for receiving the reflected signal and means for comparing the frequency of the reflected signal to the frequency of another output signal of the oscillating means, whereby the frequency difference corresponds to the time of travel of the signal within the waveguide and therefore the distance the signal travels before reflection.

REFERENCES:
patent: 3424002 (1969-01-01), Johnson
patent: 3695107 (1972-10-01), Hertz
patent: 4044353 (1977-08-01), Levy
patent: 4044354 (1977-08-01), Bosher
patent: 4044355 (1977-08-01), Edvardson

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