Rotary displacement measuring apparatus

Details Rotary displacement measuring apparatus Rotary displacement measuring apparatus

1993-05-18

1994-05-17

Cuchlinski, Jr., William A.

Geometrical instruments

Miscellaneous

Light direction

33 1N, 33706, 364559, G01B 730

Patent

active

053116666

ABSTRACT:
A rotary displacement measuring apparatus includes an axle whose rotary displacement is to be determined, with the axle being mounted to rotate about its long axis. An emitter is mounted on the axle to define a plurality of concentric tracks circumscribing the axle to rotate as the axle rotates, with each of the tracks being segmented to define a plurality of spaced-apart, conductive sections for producing electric fields when energized. Also included is a voltage source for energizing the conductive sections. A detector is disposed adjacent to the tracks of the emitter and includes a plurality of sensors, each positioned adjacent a respective track to detect the electric fields of the respective track as the axle and tracks are rotated. The detector produces signals representing the variation in the electric fields as the emitter is rotated, and these signals provide an indication of the rotary displacement of the tracks and thus of the axle.

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Rammelsberg, "Industrial Shaft Encoders", May 1978, Messon & Prufen/automatik, p. 286, 289
Kilen, IBM Technical Disclosure Bulletin vol. 26 No. 7A, Dec. 1983, "Capacitive Encoder with Carrier Suppression".

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