Process for measuring the level of fluid in a tank according to

Details Process for measuring the level of fluid in a tank according to Process for measuring the level of fluid in a tank according to

1993-10-05

1995-08-08

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

342124, G01F 2328

Patent

active

054388678

ABSTRACT:
A process for measuring the level of a liquid in a tank according to the radar principle, in which microwave energy is transmitted in the direction of the liquid level and the bottom of the tank from an antenna located above the liquid level, a measuring signal reflected from the liquid level is received by an antenna, and the liquid level may be determined from the transit time of the measuring signal, other signals than the measuring signals, i.e., spurious signals, in particular a bottom signal reflected on the bottom and which is usually relatively strong, being filtered out or otherwise taken into account by the measuring technique, and the actual distance between the antenna and the bottom of the tank (the actual bottom distance), being known, and the permittivity and permeability numbers for the liquid in the tank being at least approximately known, leads to reliable results in a way which is simpler with respect to analysis technique because of the fact that the transit time is determined for the bottom signal and an apparent bottom distance is determined from this transit time, and that from the ratio of the determined apparent bottom distance and the known actual bottom distance, the ratio of apparent to actual liquid level, and therefore the actual liquid level, is determined.

REFERENCES:
patent: 4114441 (1978-09-01), Magri
patent: 4641139 (1987-02-01), Edvardsson
patent: 4661817 (1987-04-01), Bekkadal et al.
patent: 4665403 (1987-05-01), Edvardsson
patent: 5070730 (1991-12-01), Edvardsson

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