Multi-color optical shaft position sensor

Details Multi-color optical shaft position sensor Multi-color optical shaft position sensor

1991-10-04

1993-06-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25073114, 250226, H01J 516

Patent

active

052162451

ABSTRACT:
This invention is directed to a position detection system for a rotary motor element where color is used to determine the position of the rotary motor element. Different color light pulses are emitted in the direction of a color-coded disk which rotates in accordance with the rotary motor element. The light pulses are reflected back from the disk in distinct combinations which define the position of the rotary motor element. By determining which colors of light are reflected back, the position of the motor element may be determined. The apparatus may be located remote from the position detector to extend the life and the reliability of its electronic components. The angular resolution of a range of rotary positions is dependent upon the number of color regions on the color-coded disk and the number of different colors of light pulses that are emitted.

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