Results 31 to 40 of about 61,457 (342)
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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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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Компьютерная оптика, 2021 The response of fiber specklegram sensors (FSSs) is given as function of variations in the intensity distribution of the modal interference pattern or speckle pattern induced by external disturbances.
J.D. Arango +6 more
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Acousto-electrical speckle pattern in Lorentz force electrical impedance tomography [PDF]
, 2015 Ultrasound speckle is a granular texture pattern appearing in ultrasound imaging. It can be used to distinguish tissues and identify pathologies. Lorentz force electrical impedance tomography is an ultrasound-based medical imaging technique of the tissue
Catheline, Stefan +7 more
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Objective speckle displacement resulting from the deformation of shaped objects [PDF]
, 2015 This paper describes an extended theory of the displacement of the objective speckle pattern resulting from displacement and/or deformation of a coherently illuminated diffuse object where the influence of the surface shape is included via the linear ...
Charrett, Thomas O. H., Tatam, Ralph P.
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Experimental observation of speckle instability in nonlinear disordered media
, 2005 Temporal fluctuations of the speckle pattern formed upon backscattering of a laser beam from an interface between gold and nonlinear polymer film have been observed as a function of optical power.
Agarwal +25 more
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Multiple-Input Single-Output Ghost Imaging
IEEE Photonics Journal, 2020 In this paper, we propose a multiple-input single-output ghost imaging scheme, named MISO-GI. In the scheme, K spatiotemporal speckle pattern sources (multiple input) simultaneously generate K different spatiotemporal modulated speckle patterns which ...
Le Wang, Shengmei Zhao
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Tandem-pulsed acousto-optics: an analytical framework of modulated high-contrast speckle patterns [PDF]
, 2015 Recently we presented acousto-optic (AO) probing of scattering media using addition or subtraction of speckle patterns due to tandem nanosecond pulses. Here we present a theoretical framework for ideal (polarized, noise-free) speckle patterns with unity ...
Resink, S.G., Steenbergen, W.
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Langevin description of speckle dynamics in nonlinear disordered media
, 2002 We formulate a Langevin description of dynamics of a speckle pattern resulting from the multiple scattering of a coherent wave in a nonlinear disordered medium. The speckle pattern exhibits instability with respect to periodic excitations at frequencies $
A. Heidereich +18 more
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