Noninvasive method for determining the liquid level and density

Details Noninvasive method for determining the liquid level and density Noninvasive method for determining the liquid level and density

1995-02-27

2000-04-25

Williams, Hezron

Measuring and testing

Liquid level or depth gauge

340621, 367908, G01F 2328, G08B 2100

Patent

active

060530413

ABSTRACT:
Noninvasive method for determining the liquid level and density inside of a container having arbitrary dimension and shape. By generating a flexural acoustic wave in the container shell and measuring the phase difference of the detected flexural wave from that of the originally generated wave a small distance from the generated wave, while moving the generation and detection means through the liquid/vapor interface, this interface can be detected. Both the wave generation and wave detection may be achieved by transducers on the surface of the container. A change in the phase difference over the outer surface of the vessel signifies that a liquid/vapor interface has been crossed, while the magnitude of the phase difference can be related to fluid density immediately opposite the measurement position on the surface of the vessel.

REFERENCES:
patent: 4213337 (1980-07-01), Langdon
patent: 4240285 (1980-12-01), Langdon
patent: 4248087 (1981-02-01), Dennis et al.
patent: 4383443 (1983-05-01), Langdon
patent: 4841256 (1989-06-01), Gastgeb
patent: 5015995 (1991-05-01), Holroyd
patent: 5031451 (1991-07-01), Webster
patent: 5074148 (1991-12-01), Lew
patent: 5264831 (1993-11-01), Pfeiffer
R.M. Langdon, "Vibratory Process Control Transducers," Electronic Engineering, pp. 159-168 (Nov. 1981).

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