Results 21 to 30 of about 531 (180)
Designing Physical Unclonable Functions From Optically Active Materials. [PDF]
Adv MaterAssigning unforgeable “fingerprints” to manufactured goods is a key strategy to fight global counterfeiting. Optical physical unclonable functions (PUFs) are chemically generated random patterns of optically active materials serving as unique authenticators.
Klausen M, Zhang J, Stevens MM.
europepmc +2 more sources
Oblique incidence and observation electronic speckle-pattern interferometry [PDF]
Applied Optics, 1994 In this paper we discuss an oblique incidence and observation electronic speckle-pattern interferometer, in which we use an anamorphic prism in front of the object. A collimated beam traveling through the prism is partly reflected at the base of the prism.
Joenathan, Charles +2 more
openaire +3 more sources
ESPI nondestructive testing for coating interface failure
工程科学学报, 2016 A detection platform of coating failure processes was designed and constructed on the basis of laser electronic speckle pattern interferometry(ESPI).
GAO Jin +4 more
doaj +1 more source
High-speed electronic speckle pattern interferometry [PDF]
, 2004 Electronic Speckle Pattern Interferometry (ESPI) is used to measure surface displacements. Phase shifting can be used to obtain a fringe pattern which depicts the phase at every point in an image. Previous studies have used algorithms such as the 4-bucket algorithm to obtain phase maps of objects.
openaire +2 more sources
Dynamic deformation analysis of aluminum alloy 5083 using electronic speckle pattern interferometry
Journal of Materials Research and TechnologyIn this study, we propose a phase-analysis algorithm that operates on a single contour image obtained via electronic speckle pattern interferometry (ESPI) to investigate non-uniform deformation in Al–Mg alloys.
Yuto Takanezawa +2 more
doaj +1 more source
Holographic and Video Techniques Applied to Engineering Measurement
Measurement + Control, 1971 In a brief period, lasers have developed from curiosities of the physics laboratory to tools suited to incorporation in complex instrumentation systems.
J N Butters, J A Leendertz
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工程科学学报, 2015 The initial corrosion behavior of the acrylic polyurethane coating/carbon steel interface in a 3.5% NaCl solution was in-situ investigated by electronic speckle pattern interferometry(ESPI),electrochemical impedance spectroscopy(EIS) and scanning ...
JIANG Hong-xia +5 more
doaj +1 more source
A hybrid technique for residual stress analysis through stress function fitting
Latin American Journal of Solids and StructuresThis work presents a hybrid experimental theoretical technique for residual stresses analysis of mechanical components. It was used the blind hole technique along with the Electronic Speckle Pattern Interferometry (ESPI) method and Airy stress functions ...
Marco Antonio Martins Cavaco
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The effect of low-cycle fatigue on evolution of fracture mechanics parameters in residual stress field caused by cold hole expansion [PDF]
Fracture and Structural Integrity, 2019 Localized displacement measurements based on electronic speckle-pattern interferometry are used to obtain crack mouth opening displacement (CMOD), stress intensity factor (SIF) and T-stress values during crack growth around cold-expanded holes.
Yu. G. Matvienko +2 more
doaj +1 more source
Deep Underground Science and Engineering, EarlyView.This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu +8 more
wiley +1 more source