Fluid measurement of dielectric property change in hydraulic flu

Details Fluid measurement of dielectric property change in hydraulic flu Fluid measurement of dielectric property change in hydraulic flu

1997-02-13

1999-11-30

Regan, Maura

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

92 5R, 91189R, 324635, G01R 2726

Patent

active

059949066

ABSTRACT:
The identification of and compensation for changes in the dielectric properties of a hydraulic fluid in hydraulic apparatus is achieved by continuously sampling a hydraulic fluid in a resonant chamber with a central conductor that is both inductively and capacitively coupled to an oscillator. The output frequency changes of the oscillator is an indicator of changes of the dielectric properties of the hydraulic fluid and their magnitude. The invention is of particular value in hydraulic cylinder piston position determining systems.

REFERENCES:
patent: 4737705 (1988-04-01), Bitar et al.
patent: 5150060 (1992-09-01), Bitar
patent: 5182979 (1993-02-01), Morgan
patent: 5241278 (1993-08-01), Bitar
patent: 5325063 (1994-06-01), Morgan
patent: 5438274 (1995-08-01), Bitar et al.
patent: 5471147 (1995-11-01), Allen et al.

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