Apparatus and methods for measuring and detecting variations...

Details Apparatus and methods for measuring and detecting variations... Apparatus and methods for measuring and detecting variations...

G - Physics

01

R

G01R 27/26 (2006.01) G01B 7/14 (2006.01) G05B 13/02 (2006.01) H03H 17/02 (2006.01)

Patent

CA 2158370

A method measures the value of a capacitor and detects small variations in the value of a capacitor around a reference value. The capacitance of the capacitor may be determined by applying a voltage input having a known amplitude and wave form, V, to an RC circuit having a substantially known or constant load impedance, R, and sampling the voltage across the resistor (6 or 16) or capacitor (8 or 14) at a precisely controlled elapsed time interval, T. The method permits detector circuits to be created for measuring small variations in value with precision and accuracy. Solid state keypads (30) incorporating sensor cells (32) and software algorithms provide human interface systems which are not subject to environmentally induced errors or errors due to component aging.

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