Polar co-ordinate digitizer

Details Polar co-ordinate digitizer Polar co-ordinate digitizer

1988-12-19

1990-05-08

Haroian, Harry N.

Geometrical instruments

Miscellaneous

Light direction

G01B 300

Patent

active

049226185

ABSTRACT:
An improved polar co-ordinate digitizer where a cord extensible from a base unit moves a cord guide to provide an angle measurement and is wrapped on a drum whose movement reflects a length measurement. Lateral pressure on the cord guide is minimized by a low mass pivot arm whose angle is sensed by optical photodetector techniques. In addition the length of the cord is also sensed by a similar photodetector both mounted for rotation about the origin axis of the polar co-ordinate system and utilizing a fixed reference photodetector all of which sense a continuously rotating disk with an index mark on it. Suitable calibration is provided for the system.

REFERENCES:
patent: 3832781 (1974-09-01), Flagge
patent: 4506336 (1985-03-01), Hird
patent: 4813146 (1989-03-01), Jaluzot

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