Advances in Speckle Metrology and Related Techniques by Guillermo H. Kaufmann

By Guillermo H. Kaufmann

Speckle metrology contains a number of optical concepts which are in line with the speckle fields generated via mirrored image from a coarse floor or by way of transmission via a coarse diffuser. those options have confirmed to be very worthy in trying out diverse fabrics in a non-destructive method. they've got replaced dramatically over the past years end result of the improvement of recent optical elements, with speedier and extra robust electronic pcs, and novel info processing techniques.
This most modern evaluation of the subject describes new innovations built within the box of speckle metrology during the last decade, in addition to functions to experimental mechanics, fabric technological know-how, optical trying out, and fringe research.

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1, the time variation now often refers to changes in some quantity such as wavenumber or angle of the object beam while the sample is kept stationary. As we will see, a changing wavenumber or illumination direction introduces into the interference signal a temporal carrier with a frequency that depends on depth. The carrier thus has a twofold function of providing (i) the required temporal phase shifts and (ii) a mechanism to separate the signal into separate depth-resolved bands through Fourier transformation along the time axis.

P. (2003) Evaluation of the optical rosette for translation, stresses, and stress gradients measurement. Optical Measurement Systems for Industrial Inspection III, Munich, Proc. SPIE, 5144, 533–544. H. and Albertazzi, A. J. S. Vikram), American Scientific Publishers, California, USA. Lu, J. (1996) Handbook of Measurement of Residual Stresses, The Fairmont Press, Lilburn, GA. 23 Lu, J. (2005) Handbook on Residual Stress, Society of Experimental Mechanics. J. and Vigness, I. (1966) 25 26 27 28 29 30 31 32 Hole-drilling strain-gage method of measuring residual stresses.

The scatterers in the coherence gate can therefore be separated from the others by 2D Fourier techniques, already commonly used in digital holography [6]. By repeating the measurement before and after the sample deformation, a phase difference map can then be computed that is proportional to the out-of-plane displacement component for the slice within the coherence gate. By varying the position of the translation stage, the coherence gate can be placed at different locations within the sample, thereby allowing the full 3D out-of-plane displacement field to be evaluated.

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