Polaroid absolute encoder

Details Polaroid absolute encoder Polaroid absolute encoder

2004-03-26

2009-11-24

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231140, C250S23700G

Reexamination Certificate

active

07622707

ABSTRACT:
A polaroid encoder system for detecting movement is disclosed. The system includes a movable polarizing code element. A detector module detects an amplitude based on how much illumination passes through one portion of the movable polarizing code element. A quadrant of the movable polarizing code element is determined based on how much illumination passes through another portion of the movable polarizing code element. The angular position of the movable polarizing code element can then be determined by using amplitude and the quadrant information.

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“Two and Three Channel Codewheels for use with Agilent Optical Encoder Modules”. From: Agilent, Technical Data. (12pp).

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