Optical encoders using pseudo-random-binary-sequence scales

James S. Johnston; A. E. Romer; M. S. Beales

doi:10.1117/12.50981

1 December 1991 Optical encoders using pseudo-random-binary-sequence scales

James S. Johnston, A. E. Romer, M. S. Beales

Proceedings Volume 1589, Specialty Fiber Optic Systems for Mobile Platforms; (1991) https://doi.org/10.1117/12.50981
Event: OE Fiber, 1991, Boston, MA, United States

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.

Citation Download Citation

James S. Johnston, A. E. Romer, and M. S. Beales "Optical encoders using pseudo-random-binary-sequence scales", Proc. SPIE 1589, Specialty Fiber Optic Systems for Mobile Platforms, (1 December 1991); https://doi.org/10.1117/12.50981

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