Results 291 to 300 of about 61,457 (342)
Some of the next articles are maybe not open access.
Semantic speckle: an auto-located speckle pattern for DIC measurement
Applied Optics, 2022Digital image correlation (DIC) has been widely used in both experimental mechanics and engineering fields. The matching algorithm of the DIC method usually requires surfaces containing a random speckle pattern as a deformation information carrier. The speckle pattern plays an irreplaceable role in DIC, which has led to extensive
Xiangyun Ren +4 more
openaire +2 more sources
Computer-aided speckle pattern interferometry
Applied Optics, 1983An on-line computer system for measuring the deformation of a diffuse object with a speckle interferometer is presented. Methods for evaluating a speckle interferogram using digital image processing techniques are also discussed. The system consists of an interferometric optical setup and a computer-TV image processing facility. A speckle interferogram
S, Nakadate, T, Yatagai, H, Saito
openaire +2 more sources
Electronic Speckle Pattern Interferometry
Topical Meeting on Holography, 1986Holographic workstations are now enabling the advantages of Holographic Interferometry (HI) to be taken outside research laboratories and placed alongside manufacturing equipment. Most rigidization problems have been overcome but two handicaps still limit its widespread application.
openaire +1 more source
Science, 2014
Applied Physics Intensity and pinpoint focus over long distances are probably the most familiar features of laser light. It is the spatial and temporal coherence of the light, with the photons in the laser beam marching in lockstep, that lends itself to the above features but also provides the ...
openaire +1 more source
Applied Physics Intensity and pinpoint focus over long distances are probably the most familiar features of laser light. It is the spatial and temporal coherence of the light, with the photons in the laser beam marching in lockstep, that lends itself to the above features but also provides the ...
openaire +1 more source
Considerations on speckle pattern interferometry of ultrasonic speckles
Ultrasonics, 1997A speckle pattern interferometric system which uses the properties of ultrasonic speckles has been studied. Traditionally, ultrasonic speckle patterns have been considered as annoyances which do not transfer useful information. However, changing this viewpoint, we have regarded speckle as containing useful information, and conceptually have examined ...
Suc-Kyoung Hong, Jai-Bok Han
openaire +1 more source
Measuring fluid velocities with speckle patterns
Optics Letters, 1977A new full-field technique for mapping lines of constant velocity in a fluid flow is demonstrated. The technique utilizes light scattered from scattering sites within a selected plane of interest of the flow field. The laser-speckle pattern thus formed is used with the established methods of speckle photography and interferometry to determine the ...
D B, Barker, M E, Fourney
openaire +2 more sources
Self-reconfiguration of a speckle pattern
Optics Letters, 2014It is well known that coherent Bessel beam, a nondiffracting class of beam, possesses the ability of self-reconstructing or self-healing in the presence of obstacles. Here, we generated partially coherent Bessel and Gaussian beams using a spatial light modulator and studied the speckle pattern intensity in propagation after some speckles were blocked ...
Cleberson R, Alves +2 more
openaire +2 more sources
Speckle pattern analysis of crumpled papers
Applied Optics, 2019In this paper, we show that laser speckle analysis (LSA) can provide valuable information about the structure of crumpled thin sheets. Crumpling and folding of slender objects are present in several phenomena and in various ranges of size, e.g., paper compaction, cortical folding in brains, DNA packing in viral capsids, and flower buds, to name a few ...
Vahideh Farzam Rad +4 more
openaire +2 more sources
Electronic speckle pattern interferometry
Physics in Technology, 1980Historically, the concept of replacing the photographic emulsion by video recording and display occured to several independent groups almost simultanously. Macovsky(1) in USA, Schwomma(2) in Austria and Kopf(3) in West-Germany considered the technique to be based on pure holography.
openaire +1 more source
Anisotropy of near-field speckle patterns
Optics Letters, 2005In the vicinity of a rough interface under normal illumination the speckle field has been found to be anisotropic; that is, its correlation length is much larger in the direction of polarization than in the perpendicular direction, forming stripe-shaped speckle patterns in the near-field region. Furthermore, with increasing distance from the interface,
Cheng, Liu, Seung-Han, Park
openaire +2 more sources