Results 41 to 50 of about 476,683 (323)
Phase-shifting algorithms for electronic speckle pattern interferometry [PDF]
Applied Optics, 2002 A set of innovative phase-shifting algorithms developed to facilitate metrology based on electronic speckle pattern interferometry (ESPI) are presented. The theory of a phase-shifting algorithm, called a (5,1) algorithm, that takes five phase-shifted intensity maps before a specimen is deformed and one intensity map after a specimen is deformed is ...
Kuang-Chong Wu +5 more
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Tailoring 3D Speckle Statistics [PDF]
, 2022 We experimentally generate three-dimensional speckles with customized intensity statistics. By modulating the phase front of a laser beam, far-field speckle patterns maintain the designed intensity probability density function while evolving to different spatial patterns upon axial propagation. We also create speckles with distinct intensity statistics
arxiv +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
doaj +1 more source
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
BioResources, 2012 This study investigates the bonding behaviour of Norway spruce wood strands to a surrounding cement matrix. Effects of wood swelling and shrinking during cement curing were studied by using strands of various thicknesses.
Stephan Frömel-Frybort +3 more
openalex +4 more sources
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
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 +3 more sources
Damage accumulation near the cold-expanded hole due to high-cycle fatigue by crack compliance method
Fracture and Structural Integrity, 2022 The novel destructive method is implemented for quantitative assessment of fatigue damage accumulation in the stress concentration zone accompanied by residual stress due to cold expansion of the through-thickness hole.
Yu. G. Matvienko +3 more
doaj +1 more source
Michelson Interferometry with the Keck I Telescope [PDF]
, 2000 We report the first use of Michelson interferometry on the Keck I telescope for diffraction-limited imaging in the near infrared JHK and L bands. By using an aperture mask located close to the f/25 secondary, the 10 m Keck primary mirror was transformed ...
Buscher D. +22 more
core +2 more sources
Adaptive Aperture Defocused Digital Speckle Photography
, 2005 Speckle photography can be used to monitor deformations of solid surfaces. The measuring characteristics, such as range or lateral resolution depend heavily on the optical recording and illumination set-up.
Diazdelacruz, Jose M.
core +1 more source