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Applied Optics

Applied Optics


  • Vol. 36, Iss. 13 — May. 1, 1997
  • pp: 2912–2916

High-resolution optical position encoder with large mounting tolerances

Kai Engelhardt and Peter Seitz  »View Author Affiliations

Applied Optics, Vol. 36, Issue 13, pp. 2912-2916 (1997)

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A high-resolution optical position encoder is described that consists of a scale as encountered in a standard moiré-based system, a simple imaging system with stabilized magnification and a novel segmented phase detector integrated circuit. Compared with encoder systems of comparable resolution and accuracy, the encoder presented offers large mechanical tolerances in the alignment of the reading head to the scale, while an interpolation accuracy of better than 0.1 µm is preserved. The system is especially well suited for high-resolution linear encoders as well as for the cost-effective fabrication of compact high-resolution rotary encoders.

© 1997 Optical Society of America

Original Manuscript: May 21, 1996
Revised Manuscript: October 24, 1996
Published: May 1, 1997

Kai Engelhardt and Peter Seitz, "High-resolution optical position encoder with large mounting tolerances," Appl. Opt. 36, 2912-2916 (1997)

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  1. A. R. Luxmoore, ed., Optical Transducers and Techniques in Engineering Measurement (Applied Science Publishers, London, 1983), Chap. 3, pp. 61–108.
  2. K. Engelhardt, P. Seitz, “Absolute, high-resolution optical position encoder,” Appl. Opt. 35, 201–208 (1996). [CrossRef] [PubMed]
  3. Baumer Electric AG, Frauenfeld, Switzerland, Fax. +41-52-7281144.
  4. Orbit Semiconductor Inc., 1230 Bordeaux Drive, Sunnyvale, Calif. 94089.
  5. LCS250-5 OEM Laser Interferometer, Intop Precision Engineering, D-88699 Frickingen, Germany.

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