Graticule sensor having a plurality of light detectors

Details Graticule sensor having a plurality of light detectors Graticule sensor having a plurality of light detectors

1983-08-22

1985-12-24

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, G01D 534

Patent

active

045608709

ABSTRACT:
A sensor for determining the position of a graticule which has a series of transparent and opaque areas back-illuminated with a diffused source of light. The shadow cast by the graticule is then focused onto a light detector array. Alternate elements of the light detector array are connected in parallel to provide two signals which are 180 degrees out of phase from each other. These signals are then processed and subtracted so that amplitude transitions result as the graticule alternately covers and uncovers detector elements.

REFERENCES:
patent: 3633038 (1972-01-01), Falk
patent: 4066906 (1978-01-01), Hounsfield et al.
patent: 4074258 (1978-02-01), Dore et al.
"Techniques for Digitizing Rotary and Linear Motion" by Dynamics Research Corp., Sep. 1976, pp. 4-1 through 4-11.

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