By Guillermo H. Kaufmann
Speckle metrology comprises quite a few optical concepts which are in response to the speckle fields generated by means of mirrored image from a coarse floor or via transmission via a coarse diffuser. those innovations have confirmed to be very priceless in checking out diverse fabrics in a non-destructive manner. they've got replaced dramatically over the past years as a result improvement of contemporary optical parts, with quicker and extra robust electronic pcs, and novel information processing techniques.
This newest assessment of the subject describes new ideas built within the box of speckle metrology over the past decade, in addition to functions to experimental mechanics, fabric technological know-how, optical trying out, and fringe research.
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Extra resources for Advances in Speckle Metrology and Related Techniques
1 Translation and Mechanical Stress Measurements The polar radial displacement ﬁeld measured in a circular region provides sufﬁcient information to characterize the mean level of both rigid body translations and strains or stresses that occur in that region. For uniform displacement, strain, or stress ﬁelds, the complete determination of the associated parameters is almost a straightforward process [19, 20]. In this section, rigid body computation will be analyzed. Mechanical stress ﬁeld computation will be considered in the next section.
Thus, it is possible to simultaneously measure both displacement components. Two drawbacks can be found for this approach, namely, (i) test surface can appreciably depolarize the two orthogonal polarized dual-beam illumination sets causing cross interference between them and (ii) optical setup becomes more bulky and complex. References [10, 11] have managed to deal with these limitations by developing a novel double illumination DSPI system. This interferometer presents an optical arrangement that gives radial in-plane sensitivity and its ﬁrst version will be described in detail in the following section.
SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Society of Experimental Mechanics. T. (1982) Brief investigation of 36 Mathar, J. (1934) Determination of initial induced drilling stresses in the centre-hole method of residual stress measurement. Exp. , 22, 26–30. 34 Asundi, A. and Wenzen, Z. (1998) Fast phase-unwrapping algorithm based on a gray-scale mask and ﬂood ﬁll. Appl. , 37, 5416–5420. 35 Makino, A. and Nelson, D. (1994) Residual-stress determination by singleaxis holographic interferometry and hole drilling.