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Applied Optics

Applied Optics


  • Vol. 42, Iss. 34 — Dec. 1, 2003
  • pp: 6783–6796

Three-dimensional deformation field measurement with digital speckle correlation

Thomas Fricke-Begemann  »View Author Affiliations

Applied Optics, Vol. 42, Issue 34, pp. 6783-6796 (2003)

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Digital speckle correlation is based on a detailed analysis of changes in speckle images that are recorded from laser-illuminated rough surfaces. The two in-plane components are obtained by cross-correlation of corresponding subimages, a method also known as digital speckle photography. The local gradient of the hitherto inaccessible out-of-plane component is determined from the characteristic dependence of the speckle correlation on the spatial frequency. A detailed experimental study is carried out to analyze the new technique for systematic and random measuring errors. For moderate decorrelation the accuracy of the out-of-plane measurement is better than λ/10 and thus comparable with interferometric techniques. Yet the extremely simple and robust optical setup is suited to nondestructive-testing applications in harsh environments. The quality of the deformation maps is demonstrated in a practical application.

© 2003 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(100.4550) Image processing : Correlators
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry

Original Manuscript: April 28, 2003
Revised Manuscript: July 18, 2003
Published: December 1, 2003

Thomas Fricke-Begemann, "Three-dimensional deformation field measurement with digital speckle correlation," Appl. Opt. 42, 6783-6796 (2003)

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