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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 22, Iss. 22 — Nov. 15, 1983
  • pp: 3514–3519

Displacement measurement of speckles using a 2-D level-crossing technique

Nobukatsu Takai and Toshimitsu Asakura  »View Author Affiliations


Applied Optics, Vol. 22, Issue 22, pp. 3514-3519 (1983)
http://dx.doi.org/10.1364/AO.22.003514


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Abstract

This paper proposes a new displacement method for measuring speckles using a 2-D level-crossing technique. The crossing points in space of the speckle intensity traversing a specified level are analyzed twodimensionally by using a TV-computer system. In an actual analysis, an occurrence rate histogram of the distance vectors determined by connecting the crossing points obtainable before and after displacement of speckles is investigated. It is found that the vectorial displacement of speckles can be measured from the position of the maximum occurrence in the bivariate histogram with respect to the magnitude and angle by which the displacement vector is characterized. The vectorial displacement of speckles is related to the movement of an object.

© 1983 Optical Society of America

History
Original Manuscript: May 7, 1983
Published: November 15, 1983

Citation
Nobukatsu Takai and Toshimitsu Asakura, "Displacement measurement of speckles using a 2-D level-crossing technique," Appl. Opt. 22, 3514-3519 (1983)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-22-22-3514


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References

  1. K. J. Ebeling, Opt. Acta 26, 1505 (1979). [CrossRef]
  2. K. J. Ebeling, Opt. Acta 26, 1345 (1979). [CrossRef]
  3. N. Takai, T. Iwai, T. Asakura, J. Opt. Soc. Am. 70, 450 (1980). [CrossRef]
  4. N. Takai, T. Iwai, T. Asakura, Opt. Eng. 20, 320 (1981). [CrossRef]
  5. T. Iwai, N. Takai, T. Asakura, Opt. Acta 28, 857 (1981). [CrossRef]
  6. E. Archbold, J. M. Burch, A. E. Ennos, Opt. Acta 17, 883 (1970). [CrossRef]
  7. A. E. Ennos, “Speckle Interferometry,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer, Berlin, 1975), pp. 203–253. [CrossRef]
  8. T. Asakura, N. Takai, Appl. Phys. 25, 179 (1981). [CrossRef]
  9. S. Jutamulia, H. Fujii, T. Asakura, Opt. Laser Technol. 15, 101 (1983). [CrossRef]

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