Multitrack multilevel sensing system with error detecting

Details Multitrack multilevel sensing system with error detecting Multitrack multilevel sensing system with error detecting

1990-08-31

1991-12-03

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356373, 250237G, 33707, 364739, G01B 1114, H01J 314

Patent

active

050695479

ABSTRACT:
A sensor that comprises an encoder that includes three or more tracks extending along a sensing axis. Each track i has a modulus m.sub.i, and a property that varies along the sensing axis such that the property can have one of m.sub.i distinguishable levels. The moduli m.sub.i of the tracks are all pairwise relatively prime. The tracks are formed such that a value is associated with each position along the sensing axis, the level of each track i at a given position being equal to the residue of the value at that position to modulus m.sub.i. The detector detects the levels of the tracks at a detection position along the sensing axis, and produces output signals corresponding to such levels. The track with the largest modulus comprises a redundant track that provides error detection capability.

REFERENCES:
patent: 4047025 (1977-09-01), Lemelson
patent: 4465373 (1984-08-01), Tamaki et al.
patent: 4598266 (1986-07-01), Bernardson
patent: 4816805 (1989-03-01), Vojir et al.
patent: 4999489 (1991-03-01), Huggins

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