Fresnel reflectance in refractive index estimation of light scattering solid particles in immersion liquid

2010 ◽  
Vol 96 (23) ◽  
pp. 231112 ◽  
Author(s):  
J. Räty ◽  
I. Niskanen ◽  
K.-E. Peiponen
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Solid Particles ◽  
Immersion Liquid ◽  
Index Estimation

Image Information Obtained Using a Charge-Coupled Device (CCD) Camera During an Immersion Liquid Evaporation Process for Measuring the Refractive Index of Solid Particles

2018 ◽  
Vol 72 (6) ◽  
pp. 908-912 ◽  
Author(s):  
Ilpo Niskanen ◽  
Veijo Sutinen ◽  
Göran Thungström ◽  
Jukka Räty
Keyword(s):  
Refractive Index ◽  
Physical Property ◽  
Ccd Camera ◽  
Solid Particles ◽  
Evaporation Process ◽  
Immersion Liquid ◽  
Refractive Index Measurement ◽  
Charge Coupled Device ◽  
Liquid Evaporation ◽  
A Charge

The refractive index is a fundamental physical property of a medium, which can be used for the identification and purity issues of all media. Here we describe a refractive index measurement technique to determine simultaneously the refractive index of different solid particles by monitoring the transmittance of light from a suspension using a charge-coupled device (CCD) camera. An important feature of the measurement is the liquid evaporation process for the refractive index matching of the solid particle and the immersion liquid; this was realized by using a pair of volatile and non-volatile immersion liquids. In this study, refractive indices of calcium fluoride (CaF2) and barium fluoride (BaF2) were determined using the proposed method.

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.

Light Transmission Model for Determination of the Refractive Index of Solid Particles in Suspensions: An Immersion Study

2011 ◽  
Vol 65 (5) ◽  
pp. 557-560 ◽  
Author(s):  
Jukka Räty ◽  
Ilpo Niskanen ◽  
Risto Myllylä ◽  
Kai-Erik Peiponen
Keyword(s):  
Refractive Index ◽  
Light Transmission ◽  
Solid Particles ◽  
Transmission Model
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