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Appl Opt. 2003 Jan 10;42(2):251-8.

Optimal re-referencing rate for in-plane dynamic speckle interferometry.

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  • 1LuleĆ„ University of Technology, Division of Experimental Mechanics, 97187 LuleĆ„, Sweden.


We investigate experimentally the optimal rate at which the reference speckle pattern should be updated when dynamic speckle interferometry is used to measure transient in-plane displacement fields. Images are captured with a high-speed camera and phase shifting and phase unwrapping are done temporally. For a wide range of in-plane velocities, up to a maximum of 40% of the Nyquist limit, the random errors in the calculated displacement field are minimized by updating the reference speckle pattern after a speckle displacement of 1/10 of the pixel spacing. The technique is applied to measurements of microscale deformation fields within an adhesive joint in a carbon-fiber epoxy composite.

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