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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 28 — Oct. 1, 2001
  • pp: 5011–5022

Speckle interferometry: three-dimensional deformation field measurement with a single interferogram

Thomas Fricke-Begemann and Jan Burke  »View Author Affiliations


Applied Optics, Vol. 40, Issue 28, pp. 5011-5022 (2001)
http://dx.doi.org/10.1364/AO.40.005011


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Abstract

An electronic speckle interferometer, arranged for out-of-plane sensitivity and with an off-axis reference beam to produce spatial phase bias, is used for three-dimensional deformation field measurements. The complex amplitude of the object wave is calculated by application of a Fourier-transform method to a single interferogram. The change in phase after object deformation yields the out-of-plane component of the displacement field. The two in-plane components are obtained by cross correlation of subimages of the reconstructed object wave’s intensity, a method that is also referred to as digital speckle photography. The Fourier-transform algorithm is extended and modified, leading to random measurement errors that are below widely accepted theoretical limits and also to an extended measuring range. These properties and the mutually combined information improve the accuracy of both methods compared with their usual single implementation. The performance is evaluated in experiments with pure out-of-plane, pure in-plane, and combined deformations and compared with theoretical values. An example of a practical application is given.

© 2001 Optical Society of America

OCIS Codes
(090.1760) Holography : Computer holography
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry

History
Original Manuscript: November 29, 2000
Revised Manuscript: May 30, 2001
Published: October 1, 2001

Citation
Thomas Fricke-Begemann and Jan Burke, "Speckle interferometry: three-dimensional deformation field measurement with a single interferogram," Appl. Opt. 40, 5011-5022 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-28-5011


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References

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