Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1995-12-01
1998-01-13
Karlsen, Ernest F.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324687, 324373, 324375, 73304C, G01R 2726
Patent
active
057083690
ABSTRACT:
A capacitive measuring device with a measuring electrode (3) arranged some distance from a counter-electrode (8), a dielectric material for analysis is arranged between the electrodes (3, 8), and a measuring current (IC) is supplied to the measuring electrode (3) and the capacitance-dependent capacitor voltage (UC) is measured and evaluated. The measuring electrode (3) is surrounded by a plurality of guard ring and/or auxiliary electrodes (13, 6N, 6NA) spaced apart therefrom in a staggered arrangement and at least partly covering the side walls (18), and each of which is constantly being corrected via a potential-controlling circuit (17) to the potential of the measuring electrode (3), so as to thereby largely eliminates leakage currents to the guard electrodes (13, 6N, 6NA), in the region of the measurement zone the side wall (18) being virtually completely covered with additional guard electrodes (61-6N; 61A-6NA), divided in a ribbon shape parallel to the measuring electrode (3) or divided in a two-dimensional grid, and each of the guard electrodes is wired to its potential-controlling circuit (17) in a manner that minimizes any flow of current into the guard electrodes (61-6N; 61A-6NA).
REFERENCES:
patent: 3668672 (1972-06-01), Parngll
patent: 3798541 (1974-03-01), Campbell
patent: 4853614 (1989-08-01), Carver
patent: 4899101 (1990-02-01), Porges
patent: 5134379 (1992-07-01), Maher
Scott et al, Comparison of the Use of Internal and External Electrodes for the Measurement of the Capacitance and Conductance of Fluids in Pipes, J.Phys. E. Sci. Instrum, vol. 18, pp. 587-592, Feb. 1985.
Sami et al, The Use of Capacitance Sensors for Phase Percentage Determination in Multiphase Pipelines, IEEE, vol. 29, No. 1, pp. 24-27, Mar. 1980.
Claas Kommanditgesellschaft auf Aktien
Karlsen Ernest F.
Solis Jose M.
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