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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 66, Iss. 11 — Nov. 1, 1976
  • pp: 1267–1271

Problem of defocusing in speckle photography, its connection to hologram interferometry, and its solutions

Karl A. Stetson  »View Author Affiliations


JOSA, Vol. 66, Issue 11, pp. 1267-1271 (1976)
http://dx.doi.org/10.1364/JOSA.66.001267


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Abstract

The movements, in three-dimensional space, of laser speckles observed from diffusely reflecting objects are described. The description connects these motions to relationships between fringe vectors and fringe localization in hologram interferometry. The results indicate the conditions under which defocusing leads to false measurements with conventional techniques, and methods are suggested that could solve the problem encountered due to defocusing when small displacements are to be measured on highly three-dimensional objects.

© 1976 Optical Society of America

Citation
Karl A. Stetson, "Problem of defocusing in speckle photography, its connection to hologram interferometry, and its solutions," J. Opt. Soc. Am. 66, 1267-1271 (1976)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-66-11-1267


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References

  1. E. Archbold and A. E. Ennos, "Laser Photography to Measure Deformation of Weld Cracks Under Load," Nondestructive Testing, pp. 181–184 (1975).
  2. K. A. Stetson, "The Argument of the Fringe Function in Hologram Interferometry of General Deformations," Optik 31, 576–591 (1970).
  3. E. Archbold and A. E. Ennos, "Displacement Measurement from Double Exposure Laser Photographs," Opt. Acta 19, 253 (1972).
  4. K. A. Stetson, "Fringe Interpretation for hologram Interferometry of Rigid-Body Motions and Homogeneous Deformations," J. Opt. Soc. Am. 64, 1–10 (1974).
  5. K. A. Stetson, "Fringe Vectors and Observed-Fringe Vectors in Hologram Interferometry," Appl. Opt. 14, 272–273 (1975).
  6. R. Pryputniewicz and K. A. Stetson, "Holographic Strain Analysis: Extension of Fringe-Vector Method to Include Perspective," Appl. Opt. 15, 725–728 (1976).
  7. F. D. Adams, "In-Plane Displacement Measurements Using Speckle Photographs of Holographic Images," Report No. AFFDL-TR-75-45 (unpublished) (Wright-Patterson Air Force Base, Dayton, Ohio 45433).
  8. K. A. Stetson, "Hologram Interferometry," Appl. Opt. 14, 2256–2259 (1975).
  9. H. J. Tiziani, "Analysis of Mechanical Oscillations by Speckling," Appl. Opt. 11, 2911–2917 (1972).

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