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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 24, Iss. 14 — Jul. 15, 1985
  • pp: 2172–2180

Fringe scanning speckle-pattern interferometry

Suezou Nakadate and Hiroyoshi Saito  »View Author Affiliations


Applied Optics, Vol. 24, Issue 14, pp. 2172-2180 (1985)
http://dx.doi.org/10.1364/AO.24.002172


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Abstract

Digital speckle-pattern interferometry systems for automatic measurement of deformations of a diffuse object are presented, which are based on a fringe scanning method with phase-shifted speckle interferograms. A digital speckle pattern before deformation of an object is recorded in the mass storage device of a computer facility. After deformation, four digital speckle patterns are recorded as changing the phase of reference light such as 0, π/2, π, and 3π/2, respectively. Four speckle interferograms, whose phases are shifted by 0, π/2, π, and 3π/2, are generated by calculating the square of the differences between speckle patterns before and after deformation. These interferograms are low-pass filtered to reduce speckle noise. The calculation of the arctangent with four phase-shifted speckle interferograms gives the optical path difference which is proportional to the deformation. A correction of the discontinuity of the calculated phase gives the numerical data of the deformation in the whole object area. Some experimental results for the measurement of out-of-plane, in-plane, and 3-D deformations are presented.

© 1985 Optical Society of America

History
Original Manuscript: January 28, 1985
Published: July 15, 1985

Citation
Suezou Nakadate and Hiroyoshi Saito, "Fringe scanning speckle-pattern interferometry," Appl. Opt. 24, 2172-2180 (1985)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-24-14-2172

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