Measuring and testing – Liquid level or depth gauge
Patent
1995-04-26
1997-07-29
Chilcot, Richard
Measuring and testing
Liquid level or depth gauge
73290R, G01F 2300
Patent
active
056512856
ABSTRACT:
The liquid level sensor comprises a graduated tape or cable whose free end is fixed to a plunger core that includes a housing and a probe for detecting the presence of a liquid. The probe comprises a metal waveguide having a cylindrical solid top portion, a portion of smaller section constituting a mechanical amplifier, a frustoconical portion, and a cylindrical bottom end portion constituting the sensitive portion of the probe. The metal waveguide is connected to the housing of the plunger core in sealed manner via a support flange which is fixed to the conical portion of the metal waveguide in such a manner that only the portion of the waveguide situated beneath the fixing zone emerges from the housing and can come into contact with a liquid. A transducer electrically powered by electronic processing circuits is disposed at the free end of the top portion and is excited at a predetermined frequency f.sub.i to create incident elastic waves in the waveguide.
REFERENCES:
patent: 3825025 (1974-07-01), Samuel et al.
patent: 4101865 (1978-07-01), Schurr
patent: 4299114 (1981-11-01), Silvermetz et al.
patent: 4320659 (1982-03-01), Lynnworth et al.
patent: 4890490 (1990-01-01), Telford
patent: 5031451 (1991-07-01), Webster
patent: 5099454 (1992-03-01), Dieulesaint et al.
Auxitrol S.A.
Biegel Ronald
Chilcot Richard
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