Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2007-01-09
2007-01-09
Hirshfeld, Andrew H. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S686000, C073S30400R
Reexamination Certificate
active
10533119
ABSTRACT:
A device (5) measures capacity, and includes an electrode arrangement with a plurality of electrodes (E1, E2, . . . , En) which are adjacently and/or successively arranged on a carrier (6). An intrinsic measuring device (8) measures the capacitance between a first electrode (E2), in the form of a measuring electrode, and a second electrode (E1), in the form of a counter-electrode. A controllable switching device (7) connects the electrodes (E1, E2, . . . , En), in the form of first and second electrodes (E2, E1), to the measuring device (8) in such a way that they can be switched in a pre-determinable manner. Each electrode (E1, E2, . . . , En) of the electrode arrangement can be switched in a controlled, alternate manner by the switching device (7), in the form of a measuring electrode, and respectively at least one of the other electrodes (E1, E2, . . . , En), in the form of a counter-electrode, can be switched to a pre-determinable reference potential. An associate method and a device (1) determine the level (2) of a liquid (3) using one such device (5).
REFERENCES:
patent: 4003259 (1977-01-01), Hope
patent: 6101873 (2000-08-01), Kawakatsu et al.
patent: 100 15 306 A 1 (2001-10-01), None
Mohr et al.; A New Method for Self-Calibrating Capitive Sensor; IEEE Instrumentation and Measurement Technology Conference, Budapest, May 2001, pp. 454-459.
Toth et al; A new capacitive presision liquid-level sensor; Conference on Precision Electromagnetic Measurements Digest, Jun. 1996, pp. 356-357.
Gamel Julien Frederic
Jirgal Leo Mathias
Mannebach Horst
Qu Wenmin
Dole Timothy J.
Hirshfeld Andrew H.
Hydac Electronic GmbH.
Roylance,Abrams,Berdo & Goodman, L.L.P.
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