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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 28, Iss. 20 — Oct. 15, 1989
  • pp: 4401–4406

Laser speckle rotary encoder

Ichirou Yamaguchi and Tadashige Fujita  »View Author Affiliations


Applied Optics, Vol. 28, Issue 20, pp. 4401-4406 (1989)
http://dx.doi.org/10.1364/AO.28.004401


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Abstract

A new rotary encoder is proposed which detects displacement of speckle arising in the diffraction field of a cylinder illuminated by a narrow laser beam. The displacement is detected from the peak position of the cross-correlation between the outputs of a linear image sensor. The speckle displacement due to small rotation of the cylinder is derived first. In experiments correlation is computed on a microcomputer for investigating the sensitivity and repeatability. A He–Ne laser and a laser diode are used for metal and paper surfaces. Acceleration and extension of the measurement range has also been possible by developing a real-time correlator.

© 1989 Optical Society of America

History
Original Manuscript: February 2, 1989
Published: October 15, 1989

Citation
Ichirou Yamaguchi and Tadashige Fujita, "Laser speckle rotary encoder," Appl. Opt. 28, 4401-4406 (1989)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-28-20-4401


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References

  1. I. Yamaguchi, “Real-Time Measurement of In-Plane Translation and Tilt by Electronic Speckle Correlation,” Jpn. J. Appl. Phys. 19, L133–L136 (1980). [CrossRef]
  2. I. Yamaguchi, “Automatic Measurement of In-Plane Translation by Speckle Correlation Using a Linear Image Sensor,” J. Phys. E. 19, 944–949 (1986). [CrossRef]
  3. I. Yamaguchi, “A Laser-Speckle Strain Gauge,” J. Phys. E. 14, 1270–1273 (1980). [CrossRef]
  4. I. Yamaguchi, “Simplified Laser-Speckle Strain Gauge,” Opt. Eng. 21, 436–440 (1982). [CrossRef]
  5. I. Yamaguchi, “Advances in the Laser Speckle Strain Gauge,” Opt. Eng. 27, 214–218 (1988). [CrossRef]
  6. E. Ingelstam, S. -I. Ragnarsson, “Eye Refraction Examined by Aid of Speckle Pattern Produced by Coherent Light,” Vision Res. 12, 411–420 (1972). [CrossRef] [PubMed]
  7. A. F. Fercher, H. Sprongl, “Automatic Measurement of Vertex Refraction with Coherent Light,” Opt. Acta. 22, 799–806 (1975). [CrossRef]
  8. A. Hayashi, Y. Kitagawa, “High-Resolution Rotation-Angle Measurement of a Cylinder Using Speckle Displacement Detection,” Appl. Opt. 22, 3520–3525 (1983). [CrossRef] [PubMed]
  9. I. Yamaguchi, “Speckle Displacement and Decorrelation in the Diffraction and Image Fields for Small Object Deformation,” Opt. Acta 28, 1359–1376 (1981). [CrossRef]

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