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Proceedings Paper

New-type of pseudorandom position optical encoder with submicrometer resolution: design and characterization
Author(s): Miroslav Durana; Ronald N. Miles; Philippe A. Robert
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Paper Abstract

The characteristics of a new twin-track absolute position optical encoder are presented. One tract containing a pseudorandom code and the second a periodic pattern are synchronously engraved on a glass slab. The optical reading head design composed of a LED, a gradient index lens and a linear CCD array, with simple intensity-based signal processing to read the code pattern is described in detail. This design is combined with a standard Moire method to enhance resolution. Performance enhancement of the optical reading head is studied in terms of track illumination versus code density, detector geometry versus the lens point-spread function (Airy disk); and reduction of extrinsic spatial noise by the application of thick films. Each parameter was considered in terms of the optimal field of view and depth of field of the system.

Paper Details

Date Published: 30 September 1994
PDF: 11 pages
Proc. SPIE 2263, Current Developments in Optical Design and Optical Engineering IV, (30 September 1994); doi: 10.1117/12.188021
Show Author Affiliations
Miroslav Durana, Swiss Federal Institute of Technology (Switzerland)
Ronald N. Miles, Swiss Federal Institute of Technology (Switzerland)
Philippe A. Robert, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 2263:
Current Developments in Optical Design and Optical Engineering IV
Robert E. Fischer; Warren J. Smith, Editor(s)

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