Method and apparatus for stabilizing parasitic error...

Details Method and apparatus for stabilizing parasitic error... Method and apparatus for stabilizing parasitic error...

2005-01-25

2005-01-25

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S658000, C324S661000, C324S663000

Reexamination Certificate

active

06847216

ABSTRACT:
A sensor for detecting changes in the dielectric constant of a liquid is described. The sensor has two electrodes immersed in the liquid with dielectric surfaces substantially parallel with each other, and a ramp disposed on a support between the electrodes. The ramp intersects the surfaces at obtuse and acute angles respectively and provides a surface disposed at an angle relative to an electric field extending between the two electrodes, thereby reducing parasitic effects of the sensed dielectric content of the liquid. Slots in the electrode adjacent the lower end of the ramp reduce the strength of the field proximate to the ramp and thereby further reduce the parasitic effects.

REFERENCES:
patent: 5604441 (1997-02-01), Freese et al.
patent: 5611240 (1997-03-01), Yamaguchi
patent: 6268737 (2001-07-01), Marszalek
patent: 6278282 (2001-08-01), Marszalek
patent: 6320393 (2001-11-01), Yasui et al.

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