Estimation of particle size variations for laser speckle rheology of materials
TLDR
It is demonstrated that the average particle size may be retrieved from the azimuth-angle dependence of time-averaged speckle intensities, permitting the accurate quantification of the viscoelastic moduli of materials with unknown particle size distribution using LSR.Abstract:
Laser speckle rheology (LSR) is an optical technique for assessing the viscoelastic properties of materials with several industrial, biological, and medical applications. In LSR, the viscoelastic modulus, G*(ω), of a material is quantified by analyzing the temporal fluctuations of speckle patterns. However, the size of scattering particles within the material also influences the rate of speckle fluctuations, independent of sample mechanical properties, and complicates the accurate estimation of G*(ω). Here, we demonstrate that the average particle size may be retrieved from the azimuth-angle dependence of time-averaged speckle intensities, permitting the accurate quantification of the viscoelastic moduli of materials with unknown particle size distribution using LSR.read more
Citations
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Laser Speckle Rheology for evaluating the viscoelastic properties of hydrogel scaffolds.
Zeinab Hajjarian,Hadi Tavakoli Nia,Shawn S. Ahn,Alan J. Grodzinsky,Rakesh K. Jain,Seemantini K. Nadkarni +5 more
TL;DR: In this article, a coherent laser beam illuminates the specimen and a high-speed camera acquires the time-varying speckle images, from which the frequency-dependent viscoelastic modulus, g2(t), is deduced.
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Influence of size, proportion, and absorption coefficient of spherical scatterers on the degree of light polarization and the grain size of speckle pattern.
TL;DR: The computed parameters proved to be sensitive to changes in scatterer sizes, proportions, and the absorption coefficient in media and good agreement was shown with numerical results computed using a Monte Carlo simulation of polarized light taking into account the experimental configuration.
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Tutorial on laser speckle rheology: technology, applications, and opportunities
TL;DR: The fast-paced technological advancements have primed the LSR for widespread applications in diagnosis and therapeutic monitoring, as demonstrated here, in cardiovascular disease, coagulation disorders, and tumor malignancies.
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Characterization of Bacillus thuringiensis parasporal crystals using laser speckle technique: effect of crystal concentration and dimension
Rana Nassif,Christelle Abou Nader,Jihane Rahbany,Fabrice Pellen,Dominique Salameh,Roger Lteif,Guy Le Brun,Bernard Le Jeune,Mireille Kallassy Awad,Marie Abboud +9 more
TL;DR: In this paper, the authors used laser speckle grain size and degree of light polarization to distinguish different sizes of Bacillus thuringiensis spherical crystals and different concentration within fermentation products.
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Tyndall Windows: Tunable Scattering of Disordered Solid–Liquid Matching Mixtures
TL;DR: In this paper, the authors explain and explore sharp optical diffusion modulations of solid-liquid matching mixtures based on sole refractive index modulation mismatch of optically matching materials at different states.
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