Results 41 to 50 of about 5,296,113 (405)
Temporal electronic speckle pattern interferometry for real-time in-plane rotation analysis.
Optics Express, 2018 A temporal electronic speckle pattern interferometry (ESPI) system is proposed for in-plane rotation measurement. The relationship between the rotation angle and the phase change distribution is established and the rotation direction is indicated by the ...
Shengjia Wang +5 more
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Speckle pattern optimization for DIC technologies
Acta Technica Jaurinensis, 2021 This paper contains the relation between speckle pattern and Digital Image Correlation (DIC). The most important advance in experimental mechanics has been DIC since the strain gage. The deformation (strain) of an object can be visualized by DIC.
Szabolcs Szalai, Gábor Dogossy
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Spatially Modulated Fiber Speckle for High-Sensitivity Refractive Index Sensing
Sensors, 2023 A fiber speckle sensor (FSS) based on a tapered multimode fiber (TMMF) has been developed to measure liquid analyte refractive index (RI) in this work. By the lateral and axial offset of input light into TMMF, several high-order modes are excited in TMMF,
Penglai Guo +17 more
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Optics Express, 2018 Imaging through scattering media is a common practice in many applications of biomedical imaging. Object image would deteriorate into unrecognizable speckle pattern when scattering media is presented.
Hui Chen +3 more
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Effect of Phase Relations on Speckle Pattern: Simulation and Measurement
IEEE Photonics Journal, 2019 Speckle is an important phenomenon in various applications. It can be quantified by speckle contrast. However, at present, the influence of the phase relations among the various wavelengths on speckle contrast is rarely analyzed theoretically.
Linlu He +5 more
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Evaluation of surface roughness of a machined metal surface based on laser speckle pattern
Jurnal Engineering, 2018 The surface roughness of a machined metal surface is crucial to its appearance and performance. There are hardly any in-situ methods for surface roughness measurement of moving surfaces. A study of the digital speckle patterns generated by rough surfaces
Dong Xu +3 more
semanticscholar +1 more source
Tracking moving objects through scattering media via speckle correlations [PDF]
Nature Communications, 2022 Scattering can rapidly degrade our ability to form an optical image, to the point where only speckle-like patterns can be measured. Truly non-invasive imaging through a strongly scattering obstacle is difficult, and usually reliant on a computationally ...
Y. Jauregui-Sánchez +2 more
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Self-Reconstruction Property of a Special Speckle Pattern after Obstructing by an Opaque Obstruction
Advances in Condensed Matter Physics, 2017 Numerical simulation of random optical field with special autocorrelation is performed. It can be seen that the speckle pattern with special autocorrelation is different from the general speckle pattern whose autocorrelation is a Gaussian function ...
Yanyu Chen, Huang Tan, Gaofeng Wu
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Optical fiber parameters effect on light propagation in a coiled multimode fiber
Zanco Journal of Pure and Applied Sciences, 2019 An experimental investigation behavior of speckle pattern of light at propagating in a coiled multimode optical fiber with a step refractive index. Discovered rotation of special pattern depended on the helical pitch, that is turn speckle pattern change ...
Sarkew S.Abdulkareem, Viyan J. Jalal
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Customizing Speckle Intensity Statistics [PDF]
Optica, Vol. 5, Issue 5, pp. 595-600 (2018), 2017 We develop a general method for customizing the intensity statistics of speckle patterns on a target plane. By judiciously modulating the phase-front of a monochromatic laser beam, we experimentally generate speckle patterns with arbitrarily-tailored intensity probability-density functions. Relative to Rayleigh speckles, our customized speckles exhibit
arxiv +1 more source