Results 11 to 20 of about 11,974 (122)
Astronomical optical interferometry, I: Methods and instrumentation [PDF]
Serbian Astronomical Journal, 2010 Previous decade has seen an achievement of large interferometric projects including 8-10m telescopes and 100m class baselines. Modern computer and control technology has enabled the interferometric combination of light from separate telescopes ...
Jankov S.
doaj +3 more sources
Digital, 2023 In this paper, based on Gaussian 1σ-criterion and histogram segmentation, a weighted least-squares algorithm is applied and validated on digital holographic speckle pattern interferometric data to perform phase separation on the complex interference ...
Zhenkai Chen +4 more
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THERMAL DEFORMATION WAVES IN HETEROGENEOUS MATERIALS [PDF]
Journal of Engineering Science (Chişinău), 2018 In the paper, a stress-strain detection method is used by correlation point interferometry, inwhich the resolution of the recording surface changes has been significantly (ten times) improved. This result was obtained
V. Zhukovsky +3 more
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The use of laser dynamical speckle interferometry in the study of cellular processes
Journal of Biomedical Photonics & Engineering, 2016 A speckle interferometry setup is mounted, tested and approved that allows the analysis of intracellular processes with large optical magnification. For different part of the cell, the dependences of speckle image correlation coefficients upon time are ...
A. P. Vladimirov +4 more
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Speckle Interferometry with CMOS Detector [PDF]
, 2023 In 2022 we carried out an upgrade of the speckle polarimeter (SPP) -- the facility instrument of the 2.5-m telescope of the Caucasian Observatory of the SAI MSU. During the overhaul, CMOS Hamamatsu ORCA-Quest qCMOS C15550-20UP was installed as the main detector, some drawback of the previous version of the instrument were eliminated.
arxiv +1 more source
Modern optical astronomy: technology and impact of interferometry [PDF]
Rev.Mod.Phys.74:551-600,2002, 2002 The present `state of the art' and the path to future progress in high spatial resolution imaging interferometry is reviewed. The review begins with a treatment of the fundamentals of stellar optical interferometry, the origin, properties, optical effects of turbulence in the Earth's atmosphere, the passive methods that are applied on a single ...
arxiv +1 more source
New methods for masked-aperture and speckle interferometry [PDF]
Publ.Astron.Soc.Pac. 111 (1999) 595, 1999 Diffraction-limited images can be obtained with a large optical telescope using interferometry. One such method for objects of sufficient brightness is non-redundant masking (NRM), in which observations are made through a pupil mask that contains an array of small holes. However, NRM only uses a small fraction of the available light.
arxiv +1 more source
Digital Double-Pulse Holographic Interferometry for Vibration Analysis
Shock and Vibration, 1996 Different arrangements for double-pulsed holographic and speckle interferometry for vibration analysis will be described. Experimental results obtained with films (classical holographic interferometry) and CCD cameras (digital holographic interferometry)
H.J. Tiziani, G. Pedrini
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Computational de-noising based on deep learning for phase data in digital holographic interferometry
APL Photonics, 2020 This paper presents a deep-learning-based algorithm dedicated to the processing of speckle noise in phase measurements in digital holographic interferometry.
Silvio Montresor +3 more
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Scientific Reports, 2021 The dark-field signal measures the small-angle scattering strength and provides complementary diagnostic information. This is of particular interest for lung imaging due to the pronounced small-angle scatter from the alveolar microstructure.
Sebastian Meyer +4 more
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