Optical encoding arrangement for absolute angle measurements

Details Optical encoding arrangement for absolute angle measurements Optical encoding arrangement for absolute angle measurements

1990-01-26

1991-03-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023117, 25023118, G01D 534

Patent

active

050031716

ABSTRACT:
An optical encoder features a transparent disc having three tracks arranged in a concentric configuration on the face thereof. One of the tracks has opaque markings in a particular pattern for determining a zero or starting angular reference for a rotating member. The other two tracks have opaque markings for providing high resolution, incremental angle information. Light is directed through the disc and light pulses are provided in accordance with the disposition of the markings on the respective tracks. The light pulses are converted to electrical pulses which are processed via suitable interface circuitry and a computer for determining the absolute angle through which the rotating member has rotated.

REFERENCES:
patent: 3886562 (1975-05-01), Atzinger et al.
patent: 3985448 (1976-10-01), Wiklund et al.
patent: 4779211 (1988-10-01), March

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