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Applied Optics

Applied 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)

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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

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

Ichirou Yamaguchi and Tadashige Fujita, "Laser speckle rotary encoder," Appl. Opt. 28, 4401-4406 (1989)

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  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]
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