By Guillermo H. Kaufmann
Speckle metrology comprises a number of optical innovations which are in keeping with the speckle fields generated via mirrored image from a coarse floor or through transmission via a coarse diffuser. those ideas have confirmed to be very valuable in trying out varied fabrics in a non-destructive means. they've got replaced dramatically over the past years as a result of the improvement of contemporary optical elements, with speedier and extra strong electronic desktops, and novel facts processing techniques.
This latest evaluation of the subject describes new options built within the box of speckle metrology over the past decade, in addition to purposes to experimental mechanics, fabric technological know-how, optical trying out, and fringe research.
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Additional info for Advances in Speckle Metrology and Related Techniques
Quite apart from the possibility of observing internal phenomena that might otherwise be invisible to a surface-only technique, there are in fact several distinct reasons for choosing a 3D technique. Several postprocessing steps, for example, phase unwrapping, become more reliable in three dimensions than in two. Reconstruction of 3D elastic modulus distributions becomes a tractable proposition with 3D data , whereas in general it is not possible with only 2D surface data without signiﬁcant simplifying assumptions (see Ref.
After that, a set of phaseshifted speckle interferograms is acquired and the reference phase distribution is computed and stored in the portable computer. Then, the measurement module is taken off the universal base and replaced by the hole drilling module. A blind hole is drilled with a depth of about 2 mm. After waiting some seconds for the measurement region to cool down, a second set of phase-shifted speckle interferograms is acquired and a new phase distribution is calculated and stored. Finally, the wrapped phase difference map is evaluated and the continuous phase distribution is obtained by applying a ﬂood-ﬁll phase unwrapping algorithm .
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