Measuring and testing – Liquid level or depth gauge
Patent
1989-12-20
1991-08-13
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
364582, 377 25, G01F 2328, G01N 900
Patent
active
050386115
ABSTRACT:
A system for providing a temperature compensated measurement indicative of the height of a fluid in a vessel includes an acoustic waveguide in fluid communication with the vessel. A reference target is positioned within the waveguide. Ultrasonic signals are produced in the fluid and a timer measures a first transit time representative of the time for the ultrasonic signals to travel to and from the target and a second transit time representative of the time for the ultrasonic signals to travel to and from the surface of a fluid in the waveguide. A circuit calculates the height of the fluid in the waveguide from the first and second transit times. Another circuit determines the density of the fluid in the waveguide from the first transit time and normalizes the calculated height of the fluid based on the density of the fluid such that the normalized height is indicative of the height of the fluid in the vessel.
REFERENCES:
patent: 3845288 (1974-10-01), Cornyn, Jr. et al.
patent: 4303984 (1981-12-01), Houvig
patent: 4359902 (1982-11-01), Lawless
patent: 4815323 (1989-03-01), Ellinger et al.
McShane James L.
Weldon Thomas P.
Westinghouse Electric Corp.
Yasich Daniel M.
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