Optoelectronic speed/direction detector

Details Optoelectronic speed/direction detector Optoelectronic speed/direction detector

1991-04-29

1992-11-24

Hellner, Mark

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

324175, G01P 336

Patent

active

051667410

ABSTRACT:
A detector for sensing speed/direction of movement of apparatus including a reticle with alternate transparent and opaque portions coupled to the apparatus and having a light source mounted on one side and two spaced apart light sensors on the other side, which sensors produce alternate output signals with movement of the reticle. The sensor output signals are differentially compared to produce a digital output signal with a constant duty cycle. A second pair of light sensors is utilized to produce quadrature digital signals.

REFERENCES:
patent: 3819268 (1974-06-01), Johnson
patent: 3885873 (1975-05-01), Andermo
patent: 4875769 (1989-10-01), Linebarger

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