Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1996-06-05
1999-11-02
Ballato, Josie
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324690, 324686, 324662, 34087037, G01R 2726
Patent
active
059777818
ABSTRACT:
A capacitive measuring device has a scale and a transducer, both provided with an array of electrodes. The position of the transducer with respect to the scale is determined in a processing circuit by evaluating the capacitances formed between the two arrays. These capacitances vary periodically as a function of the relative position of the transducer. The scale electrodes are spaced by a pitch (.lambda.). In order to increase the resolution, the transducer electrodes occupy possible initial positions spaced by an elementary interval (P) which is a submultiple of the pitch (.lambda.). The transducer electrodes are thus divided into N groups according to the initial position which they occupy. In order to compensate for manufacturing imprecisions of periodic type, the succession of transducer electrodes is highly non-periodic. To this end, the set intervals (I.sub.j) occupied by the sets of successive electrodes interpenetrate, and the number of unoccupied possible initial position between the bundles of electrodes is variable. A set of electrodes is a set composed of one electrode of each group.
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Ballato Josie
Brown & Sharpe Tesa S.A.
Valone Thomas
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