Results 51 to 60 of about 11,974 (122)
Advanced methods for assessing sealing ability of valve seals
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2017 The paper deals with the processes that arise when sealing valve contact surfaces. A mathematical model of elastic contact is proposed that allows solving the problem of deformation of contacting surfaces with allowance for their rigidity by solving a ...
Yu. I. Kondrashov, R. N. Sergeev
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Speckle Interferometry at SOAR Telescope in 2023
The Astronomical JournalResults of the speckle-interferometry observations at the 4.1 m Southern Astrophysical Research Telescope obtained during 2023 are presented: 1913 measurements of 1533 resolved pairs or subsystems (median separation 0.″16) and nonresolutions of 552 ...
Andrei Tokovinin +3 more
doaj +1 more source
MethodsX, 2020 Principles of coherent and non-coherent double exposure Speckle photography are presented with evaluation of shift changes in continuous and discrete areas.
V. Janák, L. Bartoněk, J. Keprt
doaj
New orbits based on speckle interferometry at SOAR [PDF]
arXiv, 2016 Orbits of 55 visual binary stars are computed using recent speckle interferometry data from the SOAR telescope: 33 first-time orbits and 22 revisions of previous orbit calculations. The orbital periods range from 1.4 to 370 years, the quality of orbits ranges from definitive to preliminary and tentative.
arxiv
Reducing phase singularities in speckle interferometry by coherence tailoring [PDF]
arXiv, 2016 Speckle interferometry is an established optical metrology tool for the characterization of rough objects. The raw phase, however, is impaired by the presence of phase singularities, making the unwrapping procedure ambiguous. In a Michelson setup, we tailor the spatial coherence of the light source, achieving a physical averaging of independent ...
arxiv
Speckle-based off-axis holographic detection for non-contact photoacoustic tomography
Current Directions in Biomedical Engineering, 2015 A very fast innovative holographic off-axis non-contact detection method for Photoacoustic Tomography (PAT) is introduced. It overcomes the main problems of most state-of-the-art photoacoustic imaging approaches that are long acquisition times and the ...
Buj C. +3 more
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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
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The Astronomical JournalThe large number of exoplanets discovered with the Transiting Exoplanet Survey Satellite (TESS) means that any observational biases from TESS could influence the derived stellar multiplicity statistics of exoplanet host stars. To investigate this problem,
Colin Littlefield +8 more
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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 "PISCO" speckle camera at Pic du Midi Observatory [PDF]
Exper.Astron. 8 (1998) 297, 2006 We present a new speckle camera designed and built at Observatoire Midi-Pyr\'{e}n\'{e}es. This focal instrument has been used for four years with the 2-meter Bernard Lyot Telescope of Pic du Midi observatory. It can be set in various operating modes: full pupil imaging, masked-pupil imaging, spectroscopy, wave-front sensor and stellar coronagraphy ...
arxiv