G - Physics – 08 – C
Patent
G - Physics
08
C
340/135.2
G08C 21/00 (2006.01) G01D 5/241 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1203866
ABSTRACT OF THE DISCLOSURE An electronic vernier measuring apparatus utilizes groups of stationary electrically conductive plates and a movable electrically conductive wide bar. The wide bar is capacitively coupled to stationary commutator-like electri- cally conductive strips to provide a greatest capacitance when the wide movable bar is positioned juxtaposed with any one of the stationary electrically conductive plates and a portion of the stationary commutator element. Individual plates of sub-pluralities of stationary plates are electri- cally interconnected to individual plates of adjacent sub- pluralities of stationary plates. Each of the stationary plates is provided with a stripe-like portion directed towards its associated commutator-like conducting element. An RC oscillator circuit is selectively coupled to each commutator- like element for a time period, during which each of the stationary plates in a sub-plurality is likewise coupled to the frequency determining input terminals of the oscillator circuit. Frequency of the oscillator is monitored each time an individual stationary plate of a sub-plurality is connected into the oscillator circuit. Vernier measurements are accom- plished by comparing the output frequency of the RC oscillator circuit during changes in capacitance, determined by the location of a plurality of vernier-like disposed narrow movable conducting bars, carried on the substrate.
398197
Medwin Albert H.
Stewart & Kolash Ltd
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