Position sensor with moire interpolation

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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Details

250231SE, 340347P, 356375, G01B 1100, G01D 538

Patent

active

045729522

ABSTRACT:
A position sensor has a scale consisting of tracks of indicia in the form of bar patterns acting on a detector having a two-dimensional array of sensitive elements. One track has indicia with a pitch slightly greater than the pitch of the sensitive elements and another track has indicia with a pitch slightly less than the pitch of the sensitive elements. The other tracks provide a coarse determination of the position of the scale relative to the detector while the first two tracks provide resolution of the position to less than the pitch of the sensitive elements. There is sufficient redundant information to enable accurate position detection even if there are optical or electrical perturbations in the detection of individual indicia.

REFERENCES:
patent: 4315252 (1982-02-01), Tagami
patent: 4421980 (1983-12-01), Kuhne
patent: 4423958 (1984-01-01), Schmitt

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