By Guillermo H. Kaufmann
Speckle metrology contains numerous optical thoughts which are according to the speckle fields generated by way of mirrored image from a coarse floor or through transmission via a coarse diffuser. those options have confirmed to be very worthy in trying out varied fabrics in a non-destructive manner. they've got replaced dramatically over the past years as a result of improvement of recent optical elements, with swifter and extra robust electronic desktops, and novel information processing techniques.
This newest review of the subject describes new recommendations constructed within the box of speckle metrology over the past decade, in addition to purposes to experimental mechanics, fabric technology, optical trying out, and fringe research.
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Additional resources for Advances in Speckle Metrology and Related Techniques
Application of digital techniques allows the automation of the data analysis process, which is usually based on the extraction of the optical phase distribution encoded by correlation fringes . Diaz et al.  presented a hole drilling and DSPI combined system with automated data analysis to measure uniaxial residual stress ﬁelds whose direction was coincident with the direction of the in-plane illumination. For this system, the main residual stress direction should be known before starting the measurement in order to adequately orient the in-plane illumination.
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.
0 mm and blocking the light rays reﬂected to the center of the measurement area. 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.
Advances in Speckle Metrology and Related Techniques by Guillermo H. Kaufmann