Low-cost linear and liquid position transducers

Details Low-cost linear and liquid position transducers Low-cost linear and liquid position transducers

2006-02-15

2009-02-10

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S663000

Reexamination Certificate

active

07489144

ABSTRACT:
Cost-effective methods and apparatus are disclosed for measuring both absolute position and fluctuations using a moving dielectric medium between fixed electrodes. A position sensor according to the invention includes a pair of spaced-apart electrodes, an elongated dielectric that moves between the electrodes, and electrical circuitry interconnected to the electrodes to determine the position of the dielectric relative to the electrodes. To realize a linear position sensor, the electrodes are electrically conductive rods or wires, and the dielectric is also an electrically non-conductive rod or wire. The dielectric may be flexible or stiff, in which case the dielectric and the electrodes are preferably substantially parallel to one another. Alternatively, the spaced-apart electrodes may be concentric tubes, with the dielectric being an electrically non-conductive tube slideably disposed between the electrodes. In different embodiments, the dielectric is a liquid-receiving tube. The tube may be straight, forming part of a level sensor or curved, forming part of a rotation sensor or manometer.

REFERENCES:
patent: 2746295 (1956-05-01), Lubkin
patent: 3540277 (1970-11-01), Roth et al.
patent: 4814657 (1989-03-01), Yano et al.
patent: 5611240 (1997-03-01), Yamaguchi
patent: 6204669 (2001-03-01), Beard et al.
patent: 2004/0187589 (2004-09-01), Ferran et al.
patent: 2005/0217369 (2005-10-01), Holappa et al.

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