Results 41 to 50 of about 11,974 (122)
Nuclear Materials and Energy, 2021 The retroreflectors in EAST (Experimental Advanced Superconducting Tokamak) are important optical components of Polarimeter-Interferometer (POINT) system, working as the first mirrors to reflect the incident far-infrared laser.
Hongbei WANG +6 more
doaj
Measuring micro-displacements of specular surfaces using speckle interferometry [PDF]
arXiv, 2018 The displacement field of an object surface can be measured by using speckle interferometry. This technique is based on the phenomenon of laser speckle and consists in correlating speckle interferograms taken after and before the deformation of the surface.
arxiv
Artificial Neural Networks Application in Modal Analysis of Tires
Measurement Science Review, 2013 The paper deals with the application of artificial neural networks (ANN) to tires’ own frequency (OF) prediction depending on a tire construction. Experimental data of OF were obtained by electronic speckle pattern interferometry (ESPI).
Koštial P. +5 more
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Mapping nanoscale topographic features in thick tissues with speckle diffraction tomography
Light: Science & Applications, 2023 Resolving three-dimensional morphological features in thick specimens remains a significant challenge for label-free imaging. We report a new speckle diffraction tomography (SDT) approach that can image thick biological specimens with ~500 nm lateral ...
Sungsam Kang +6 more
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Phase-sensitive interferometry of decorrelated speckle patterns [PDF]
arXiv, 2019 Phase-sensitive coherent imaging exploits changes in the phases of backscattered light to observe tiny alterations of scattering structures or variations of the refractive index. But moving scatterers or a fluctuating refractive index decorrelate the phases and speckle patterns in the images.
arxiv
Digital Shearing Speckle Pattern Interferometry Based on Rochon Prism and Its Application
Applied Sciences, 2019 This paper presents improved digital shearing speckle pattern interferometry based on Rochon Prism. The advantage of this method is that it avoids the shadow noise caused by transmission light, which improves the shearography accuracy.
Xu Wang +7 more
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Stress and Strain Fields Analysis by Method ESPI with Use of Fixture for Shear Examination Arcan [PDF]
Transactions of the VŠB-Technical University of Ostrava, Mechanical Series, 2013 This article describes the possibilities of utilizing of ESPI - Electronic Speckle Pattern Interferometry for system Q-100 application for strain and stress analysis on surface of flat specimens predominantly loaded by shear deformation.
Matúš KALINA +2 more
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Study of Laser Radiation Effect on the Cornea of the Eye by Speckle Interferometry
Journal of Biomedical Photonics & Engineering, 2020 The existing techniques of laser vision correction – one of the most widespread operations – are based presently on a surgical intervention in cornea tissue.
Victoria A. Fedulova +2 more
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Ind. J. Phys. (1999), 73B, 553-577, 1999 We have presented the basic mathematical treatment of interferometry in the optical domain. Its applications in astronomical observations using both the single aperture, as well as the diluted apertures are described in detail. We have also described about the shortcomings of this technique in the presence of Earth's atmosphere. A short descriptions of
arxiv
Computationally efficient method for retrieval of atmospherically distorted astronomical images [PDF]
, 2014 Speckle Imaging based on triple correlation is a very efficient image reconstruction technique which is used to retrieve Fourier phase information of the object in presence of atmospheric turbulence. We have developed both Direct Bispectrum and Radon transform based Tomographic speckle masking algorithms to retrieve atmospherically distorted ...
arxiv +1 more source