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

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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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 [30]. 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 [31] and diffusely scattering surfaces [32] 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 [18] 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.

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