1 December 1991 Optical encoders using pseudo-random-binary-sequence scales
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James S. Johnston, A. E. Romer, M. S. Beales, "Optical encoders using pseudo-random-binary-sequence scales", Proc. SPIE 1589, Specialty Fiber Optic Systems for Mobile Platforms, (1 December 1991); doi: 10.1117/12.50981; https://doi.org/10.1117/12.50981

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