By Guillermo H. Kaufmann
Speckle metrology contains a number of optical recommendations which are in keeping with the speckle fields generated via mirrored image from a coarse floor or via transmission via a coarse diffuser. those options have confirmed to be very invaluable in checking out assorted fabrics in a non-destructive manner. 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 information processing methods.
This most recent review of the subject describes new recommendations built within the box of speckle metrology during the last decade, in addition to purposes to experimental mechanics, fabric technological know-how, optical trying out, and fringe research.
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Extra info for Advances in Speckle Metrology and Related Techniques
At least six measured points are necessary to determine all the six coefﬁcients. Usually, few tens of thousands measured points are used and the coefﬁcients are computed by the least squares method. Since the coefﬁcients are all linear, the least squares can be carried out in a straightforward way using a multilinear ﬁtting procedure. 2 Residual Stress Measurement The stress ﬁeld that exits in the bulk of some materials without application of external loads or other stress sources is known as residual stress [22, 23].
More recently, de Groot described a wavelength scanning interferometer able to separate the interferograms from two different optical surfaces on a common optical path . A phase shifting formula tuned to the temporal frequency of the surface of interest effectively eliminated the signal from the unwanted surface, allowing an accurate phase map of the ﬁrst surface to be obtained. The use of phase information to measure 2D depth-resolved displacement ﬁelds takes this idea a stage further. Proof-of-principle experiments on a pair of specularly reﬂecting surfaces  and diffusely scattering surfaces  showed how independent displacement ﬁelds associated with rigid body rotation of the two surfaces could be separated.
13). 11, the ratio between them will be constant. Reference  compares the inﬂuence on the sensitivity of the interferometer when a DOE is used instead of conical mirror. 5 more fringes compared to those obtained with the red laser. 21b shows a phase map obtained for green light for the same displacement ﬁeld. 22a and b shows the phase maps for the same displacement ﬁeld obtained by using the diffractive optical element instead of the conical mirror. As the ﬁgure shows, it can be noted that fringe amounts are the same for both.