Dual tube sonic level gage

Details Dual tube sonic level gage Dual tube sonic level gage

Filed on

1990-12-24

Date issued

1991-11-05

Examiner

Yasich, Daniel M.

Patent Class

Measuring and testing

SubClass

Liquid level or depth gauge

Other Related Categories

340621, 367908, G01F 2328, G01H 500

Type

Patent

Status

active

Patent number

050622951

Description

ABSTRACT:
An accurate measurement of liquid levels in a tank are made using a dual tube sonic level gage. This uses plane waves of sound, in air, propagated in two vertical tubular wave guides to locate the levels of liquid contained in each tube. One tube has slots at the bottom and allows both the light (upper) and the heavy (lower) liquids to be present inside the tube at the same level as outside (i.e. in the tank). The other tube allows only the lower liquid to enter it. In the application for a measurement of gasoline and water levels in a tank, levels outside the tube (i.e. in the tank) are calculated using the equations of hydrostatics. Corrections due to temperature need not be made in order to obtain levels accurate to 1 percent.

REFERENCES:
patent: 4679430 (1987-07-01), Scott-Kesten et al.
patent: 4762425 (1988-08-01), Shakkottai
patent: 4805453 (1989-02-01), Haynes
patent: 4876889 (1989-10-01), Shakkottai
patent: 4928525 (1990-05-01), Aderholt et al.
patent: 4934186 (1990-06-01), McCoy
Lynnworth & Patch, New Sensors For Ultrasound: Measuring Temperature Profiles, Materials Research Standards, vol. 10, No. 8, p. 10, Aug. 1970.

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