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Proceedings Paper

Optical encoders using pseudo-random-binary-sequence scales
Author(s): James S. Johnston; A. E. Romer; M. S. Beales
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Paper Abstract

Single-track absolute encoders have the advantage of mechanical simplicity although they require more complex electronics and software than conventional multi-track instruments. The presence of intelligence at the point of measurement means that diagnostics can be incorporated which are not possible in the conventional instrument. The instruments described here use a track encoded with a pseudo-random-binary-sequence (PRBS) a small section of which is imaged onto a line-scan sensor. The digital word so imaged gives the coarse position while the exact location of edges in the image gives the fine position.

Paper Details

Date Published: 1 December 1991
PDF: 7 pages
Proc. SPIE 1589, Specialty Fiber Optic Systems for Mobile Platforms, (1 December 1991); doi: 10.1117/12.50981
Show Author Affiliations
James S. Johnston, Rosemount Ltd. (United Kingdom)
A. E. Romer, Rosemount Ltd. (United Kingdom)
M. S. Beales, Rosemount Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 1589:
Specialty Fiber Optic Systems for Mobile Platforms
Norris E. Lewis; Emery L. Moore, Editor(s)

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