Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1990-08-10
1993-03-16
Harvey, Jack B.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324678, 324662, 73718, G01N 2726, G01L 912
Patent
active
051948192
ABSTRACT:
A capacitive sensing circuit and system includes a variable capacitance sensing element as an active element in a circuit to measure changes in capacitance of the sensing element. A switching network in alternate cycles energizes a capacitor to develop a charge which effectively linearizes the sensor's capacitance response. In a push-pull circuit with two active sensing elements, a multi-channel switching network energizes two fixed correction capacitors to provide third or higher order correction, significantly extending the effective scale of the sensor. In a preferred embodiment, a single feedback signal is applied to all capacitors in different switching cycles. Examples include weight and pressure sensing systems.
REFERENCES:
patent: 4683754 (1987-08-01), Hirata et al.
patent: 4791352 (1988-12-01), Frick et al.
patent: 4831325 (1989-05-01), Watson, Jr.
patent: 4878012 (1989-10-01), Schulte et al.
patent: 4975700 (1990-12-01), Tan et al.
Harvey Jack B.
Setra Systems, Inc.
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