Resonance frequency liquid level sensor

Details Resonance frequency liquid level sensor Resonance frequency liquid level sensor

1990-02-09

1991-10-08

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

G01F 2300

Patent

active

050543180

ABSTRACT:
A liquid level sensor comprises an elongated member with at least one fixed extremity under flexural vibration extending across free surface of a liquid and a slide member attached to the elongated member in a sliding relationship following the length thereof, wherein the slide member floats at the free surface of liquid by buoyancy force thereof or is attracted to a float with a magnet; whereby the liquid level is determined from a natural frequency of the flexural vibration of the elongated member, that varies as a function of the liquid level.

REFERENCES:
patent: 1257693 (1918-02-01), Furman
patent: 3372592 (1968-03-01), Gravert
patent: 3555905 (1971-01-01), George
patent: 3874236 (1975-04-01), Reck
patent: 4213337 (1980-07-01), Langdon
R. M. Langdon, "Vibratory Process Control Transducers", Electronic Engineering vol. 53, No. 659 Nov. 1981, pp. 159-162.

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