Scattering patterns from thin optical fibres

1980 ◽  
Vol 58 (12) ◽  
pp. 1698-1702
Author(s):  
John W. Y. Lit
Keyword(s):  
Quality Control ◽  
Refractive Index ◽  
Light Scattering ◽  
Optical Fibre ◽  
Electromagnetic Waves ◽  
Scattered Light ◽  
Fibre Axis ◽  
Optical Fibres

The light scattering property of a thin optical fibre is studied theoretically. Plane polarized electromagnetic waves with their E-vector and H-vector parallel to the fibre axis are considered to fall perpendicularly on the fibre. Selected maxima and minima in the scattered light patterns are found to be very sensitive to the fibre parameters. The results may be used as a sensitive quality control of the fibre radius or refractive index while the fibre is being drawn.

Polydisperse Mie theory applied to hollow latex spheres: An integrated light-scattering study

1992 ◽  
Vol 70 (6) ◽  
pp. 401-406 ◽  
Author(s):  
K. B. Strawbridge ◽  
F. R. Hallett
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Scattered Light ◽  
Mie Theory ◽  
Theoretical Models ◽  
Light Scattering Spectroscopy ◽  
Latex Spheres ◽  
Scattering Study ◽  
Computer Controlled ◽  
Sphere Suspensions

Integrated light-scattering spectroscopy provides a method of determining the size, coat thickness, and lumen refractive index of a variety of coated-sphere systems. Integrated light-scattering spectroscopy performed on hollow-latex-sphere suspensions also provides a basis for validating theoretical models, such as Rayleigh–Gans–Debye or Mie, of coated-sphere systems such as vesicles and micelles. The rigidity and stability of hollow latex spheres makes them an excellent candidate for the simulation of a "perfect" coated-sphere system and allows one to determine the effects of other nonstructural factors such as polydispersity. The computer controlled spectrometer collects data in the form of I(Q) vs. Q where I(Q) is the intensity of the scattered light. Mie theory, which provides an exact solution for the absorption and scattering of a sphere of arbitrary radius and refractive index, is used to fit the experimental data. The results are compared with data obtained from dynamic light scattering and electron microscopy.

LIGHT-SCATTERING APPARATUS AND TECHNIQUES FOR MEASURING MOLECULAR WEIGHTS OF HIGH POLYMERS

1949 ◽  
Vol 27b (10) ◽  
pp. 791-806 ◽  
Author(s):  
H. J. Hadow ◽  
H. Sheffer ◽  
J. C. Hyde
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Light Scattering ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Scattered Light ◽  
Molecular Weights ◽  
Sources Of Error ◽  
Reduced Intensity

Apparatus is described for the measurement of small amounts of scattered light, dissymmetry of radiation, depolarization, and very small refractive index differences. Methods of calibration are critically examined. Benzene was adopted as a turbidity standard. Measurements were made on fractionated polystyrene of known molecular weight and on bovine serum albumin solutions. Values of the reduced intensity for benzene were obtained:[Formula: see text]Degree and sources of error are discussed

Quality Control Parameters of Mandukarni Syrup - A classical memory enhancing dosage form

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Almas Tarannum ◽  
Prathviraj Puranik ◽  
Suma V. Mallya
Keyword(s):  
Quality Control ◽  
Refractive Index ◽  
Specific Gravity ◽  
Dosage Form ◽  
Reducing Sugar ◽  
Standard Protocol ◽  
Direct Impact ◽  
Control Parameters ◽  
Quality Control Parameters ◽  
Memory Enhancing

Ayurveda is the healing medicine. Dosha, Dhatu, Mala and Agni play important role in maintaining health of a person, but without equilibrium of Atma, Indriya and Manas they are helpless. Manas is one entity which is the controller of health. There are several herbs which have direct impact on Manas, among them Mandukaparni is one. Swarasa of Mandukaparni is highly effective, but it is not easily available for children. This study is intended to make Syrup form of Mandukaparni and evaluate its pharmacognostical parameters. According to the methodology refractive index, total solids, specific gravity, reducing and non Reducing sugar and HPTLC parameters were assessed. The results were found to be genuine fulfilling the standard protocol. This study is under taken to evaluate the pharmacognostic properties of Mandukaparni syrup.

Stress Whitening in Polypropylene. I. Light Scattering Theory and Model Experiments

1995 ◽  
Vol 60 (11) ◽  
pp. 1875-1887 ◽  
Author(s):  
Jaroslav Holoubek ◽  
Miroslav Raab
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Incident Light ◽  
Polymeric Materials ◽  
Wavelength Dependence ◽  
Theoretical Background ◽  
Surrounding Matrix ◽  
Embedded Particles ◽  
The One ◽  
Stress Whitening

Theoretical background for an optical method is presented which makes it possible to distinguish unambiguously between voids and particles as light scattering sites in polymeric materials. Typical dependences of turbidity as a function of diameter of scattering elements, their volume fractions and also turbidity curves as a function of the wavelength of the incident light were calculated, based both on the Lorenz-Mie theory and the fluctuation theory. Such dependences calculated for polypropylene-containing voids on the one hand and particles, differing only slightly from the surrounding matrix in their refractive index, on the other hand, are markedly different. The most significant results are: (i) Turbidity is at least by two orders of magnitude larger for voids in comparison to embedded particles of ethylene-propylene (EPDM) rubber of the same size, concentration and at the same wavelength. (ii) The wavelength dependence of turbidity for EPDM particles and the inherent refractive index fluctuations in the polypropylene matrix is much steeper as compared to voids for all considered diameters (0.1-10 μm). Thus, the nature of stress whitening in complex polymeric materials can be determined from turbidity measurements.

A Time-Resolved Low-Angle Light Scattering Apparatus. Application to Phase Separation Problems in Polymer Systems

2001 ◽  
Vol 66 (6) ◽  
pp. 973-982 ◽  
Author(s):  
Čestmír Koňák ◽  
Jaroslav Holoubek ◽  
Petr Štěpánek
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
Signal To Noise Ratio ◽  
Scattered Light ◽  
Ccd Camera ◽  
Time Resolved ◽  
Polymer Systems ◽  
Software Analysis ◽  
Phase Separation Kinetics ◽  
Small Angle Light Scattering

A time-resolved small-angle light scattering apparatus equipped with azimuthal integration by means of a conical lens or software analysis of scattering patterns detected with a CCD camera was developed. Averaging allows a significant reduction of the signal-to-noise ratio of scattered light and makes this technique suitable for investigation of phase separation kinetics. Examples of applications to time evolution of phase separation in concentrated statistical copolymer solutions and dissolution of phase-separated domains in polymer blends are given.

scholarly journals Light-Scattering Simulations from Spherical Bimetallic Core–Shell Nanoparticles

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 359
Author(s):  
Francesco Ruffino
Keyword(s):  
Optical Properties ◽  
Light Scattering ◽  
Bimetallic Nanoparticles ◽  
Dominant Role ◽  
Scattered Light ◽  
Specific Interaction ◽  
Surface Enhanced Raman Spectroscopy ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
The Core

Bimetallic nanoparticles show novel electronic, optical, catalytic or photocatalytic properties different from those of monometallic nanoparticles and arising from the combination of the properties related to the presence of two individual metals but also from the synergy between the two metals. In this regard, bimetallic nanoparticles find applications in several technological areas ranging from energy production and storage to sensing. Often, these applications are based on optical properties of the bimetallic nanoparticles, for example, in plasmonic solar cells or in surface-enhanced Raman spectroscopy-based sensors. Hence, in these applications, the specific interaction between the bimetallic nanoparticles and the electromagnetic radiation plays the dominant role: properties as localized surface plasmon resonances and light-scattering efficiency are determined by the structure and shape of the bimetallic nanoparticles. In particular, for example, concerning core-shell bimetallic nanoparticles, the optical properties are strongly affected by the core/shell sizes ratio. On the basis of these considerations, in the present work, the Mie theory is used to analyze the light-scattering properties of bimetallic core–shell spherical nanoparticles (Au/Ag, AuPd, AuPt, CuAg, PdPt). By changing the core and shell sizes, calculations of the intensity of scattered light from these nanoparticles are reported in polar diagrams, and a comparison between the resulting scattering efficiencies is carried out so as to set a general framework useful to design light-scattering-based devices for desired applications.

A near zero refractive index metalens to focus electromagnetic waves with phase compensation metasurface

2017 ◽  
Vol 69 ◽  
pp. 432-436 ◽  
Author(s):  
Akram Boubakri ◽  
Fethi Choubeni ◽  
Tan Hoa Vuong ◽  
Jacques David
Keyword(s):  
Refractive Index ◽  
Electromagnetic Waves ◽  
Phase Compensation
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