High accuracy miniature grating encoder readhead using fiber...

Details High accuracy miniature grating encoder readhead using fiber... High accuracy miniature grating encoder readhead using fiber...

2005-06-14

2005-06-14

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160, C356S499000

Reexamination Certificate

active

06906315

ABSTRACT:
A fiber optic encoder readhead for sensing the displacement of a scale grating is disclosed. The detector channels of the readhead are fiber optic detector channels having respective phase grating masks. The fiber optic encoder readhead is configured to detect the displacement of a self-image of the scale grating. In various exemplary embodiments, the fiber optic readhead is constructed according to various design relationships that insure a robust signal-to-noise ratio. Accordingly, high levels of displacement signal interpolation may be achieved, allowing sub-micrometer displacement measurements. The fiber optic encoder readhead may be assembled in a particularly accurate and economical manner and may be provided in a package with dimensions on the order of 1-2 millimeters.

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Patorski, K., “The Self-Imaging Phenomenon and Its Applications,”Progress in Optics,ed. E. Wolf, 27, 3-108, North Holland, Amsterdam 1989.

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