Use of a joint transform correlator architecture for study of speckle displacements

Muravsky, Leonid I.; Maksymenko, O. P.; Sakharuk, О. М.

doi:10.1016/j.optcom.2004.06.067

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…The median and subset thresholding procedures applied for this purpose use the constant threshold, which is defined as the median of a JPS or the median of a JPS segmented on rows of pixels [11]. Calculations of the peak-to-output ratios and displacement errors for all pairs of subimages r m,n and s m,n selected from test speckle patterns have shown the increase of the PONR, decrease of a random displacement error and bias error in comparison with the same characteristics calculated in a conventional JTC [9].…”

Section: Constant Thresholdingmentioning

confidence: 93%

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Performance of optical speckle displacement technique near-stress concentrators

et al. 2007

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The optical speckle-displacement correlation technique was developed to increase the reliability of surface displacement field recovery near stress concentrators. The performance of optical speckle correlators based on joint transform correlator (JTC) architecture and a joint power spectrum nonlinear filtering (median thresholding, adaptive median thresholding, ring median thresholding) is studied by using computer models of these correlators. The design of hybrid joint transform speckle correlator is detailed. Example results of correlation signal using computer models of digital speckle correlation and optical speckle-displacement correlation techniques and created hybrid joint transform speckle correlator setup are described.

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Section: Constant Thresholdingmentioning

confidence: 93%

“…The proposed recently optical speckle-displacement correlation (OSDC) technique [9] just like DSC is adapted to produce surface displacement and strain spatial distributions on the basis of created grid of correlation peaks. The proposed OSDC technique is based on JTC architecture.…”

Section: Introductionmentioning

confidence: 99%

Performance of optical speckle displacement technique near-stress concentrators

et al. 2007

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“…Research of spatial distribution of biological activity in different biological materials can also be accomplished with the help of the spatial-temporal speckle correlation (STSC) technique, which was mentioned for the first time in conference papers 19 and was minutely analyzed in Ref. 20.…”

Section: Modified Spatial-temporal Speckle Correlation Techniquementioning

confidence: 99%

Application of biospeckles for assessment of structural and cellular changes in muscle tissue

2015

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A modified spatial-temporal speckle correlation technique for operational assessment of structural changes in muscle tissues after slaughtering is considered. Coefficient of biological activity as a quantitative indicator of structural changes of biochemical processes in biological tissues is proposed. The experimental results have shown that this coefficient properly evaluates the biological activity of pig and chicken muscle tissue samples. Studying the degradation processes in muscle tissue during long-time storage in a refrigerator by measuring the spatial-temporal dynamics of biospeckle patterns is carried out. The reduction of the bioactivity level of refrigerated muscle tissue samples connected with the initiation of muscle fiber cracks and ruptures, reduction of sarcomeres, nuclei deformation, nuclear chromatin diminishing, and destruction of mitochondria is analyzed.

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“…During loading, with a step of 250 kg the photos of area 3 × 4 mm at the crack tip were taken by CCD camera (resolution 640 × 480 px) equipped with a microscopic objective and the image capturing device National Instruments IMAQ PCI-1409. The obtained images were used for processing by the method of digital images correlation (DIC), with an accuracy of displacement evaluation ±1 px (0.006 mm) (Muravsky et al 2004;Panasyuk et al 2004). …”

Section: Testing Proceduresmentioning

confidence: 99%

“…For today many techniques for plastic zone size measurement are known (Uuz and Martin 1996), but a majority of them don't allow to determine the deformation distribution in this zone. A digital image correlation method (DIC) (Muravsky et al 2004;Panasyuk et al 2004) used in this paper allows us to do this with high accuracy. In many publications (Weber et al 2005;Yagodzinskyy et al 2010) it is shown, that hydrogen influences the material deformation in the crack tip as well as changes plastic zone form and size.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen influence on fracture of sheet carbon steel

et al. 2012

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Results of the researches of hydrogen influence on fracture of 65 sheet spring steel by several methods are presented. The distribution of deformation and topography of a hollow in front of the crack tip is determined, the stress intensity factor is calculated, fractographic analysis of a fracture surface and metallographic analysis of the morphology of crack distribution are carried out. The decrease of operation characteristics of the material as a result of hydrogen influence which becomes apparent in localization of plastic deformations and intensive delamination on the layers of rolling is established.

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Use of a joint transform correlator architecture for study of speckle displacements

Cited by 10 publications

References 24 publications

Performance of optical speckle displacement technique near-stress concentrators

Performance of optical speckle displacement technique near-stress concentrators

Application of biospeckles for assessment of structural and cellular changes in muscle tissue

Hydrogen influence on fracture of sheet carbon steel

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