Theoretical and experimental investigation of the extinction in a dense distribution of particles: nonlocal effects

Hespel, Laurent; Mainguy, S.

doi:10.1364/josaa.18.003072

Cited by 26 publications

(18 citation statements)

References 18 publications

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“…Their contribution depends on the ordering in the arrangement of the particles, characterized by the radial distribution function G ( r ) which describes the probability of finding two particles spaced a difference r apart. We may write [38, 39]:where | q | = 2ksin( θ /2). The term S ( θ ,hct) is called the structure factor, which thus allows to describe the angular scattering pattern from an ensemble of particles in terms of the scattered intensity pattern of a single particle, by applying a hct-dependent angular weighting of the scattered light.…”

Section: Part Ii: the Scattering Properties Of Whole Bloodmentioning

confidence: 99%

A literature review and novel theoretical approach on the optical properties of whole blood

et al. 2013

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Optical property measurements on blood are influenced by a large variety of factors of both physical and methodological origin. The aim of this review is to list these factors of influence and to provide the reader with optical property spectra (250–2,500 nm) for whole blood that can be used in the practice of biomedical optics (tabulated in the appendix). Hereto, we perform a critical examination and selection of the available optical property spectra of blood in literature, from which we compile average spectra for the absorption coefficient (μa), scattering coefficient (μs) and scattering anisotropy (g). From this, we calculate the reduced scattering coefficient (μs′) and the effective attenuation coefficient (μeff). In the compilation of μa and μs, we incorporate the influences of absorption flattening and dependent scattering (i.e. spatial correlations between positions of red blood cells), respectively. For the influence of dependent scattering on μs, we present a novel, theoretically derived formula that can be used for practical rescaling of μs to other haematocrits. Since the measurement of the scattering properties of blood has been proven to be challenging, we apply an alternative, theoretical approach to calculate spectra for μs and g. Hereto, we combine Kramers–Kronig analysis with analytical scattering theory, extended with Percus–Yevick structure factors that take into account the effect of dependent scattering in whole blood. We argue that our calculated spectra may provide a better estimation for μs and g (and hence μs′ and μeff) than the compiled spectra from literature for wavelengths between 300 and 600 nm.

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Section: Part Ii: the Scattering Properties Of Whole Bloodmentioning

confidence: 99%

A literature review and novel theoretical approach on the optical properties of whole blood

et al. 2013

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“…The concept and measurement of the effective RI has been associated only with the so-called coherent component of light [11,[14][15][16][17]19,25]. Therefore its measurement in turbid media has been pursued primarily using the propagation or reflection of the coherent component of light.…”

Section: Introductionmentioning

confidence: 99%

Refractive index measurement of turbid media by transmission of backscattered light near the critical angle

Contreras-Tello

Garcı́a-Valenzuela

2014

Appl. Opt.

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We investigate experimentally the determination of the effective refractive index (RI) of a turbid particle suspension from the angle dependence of light scattered by the particles and then transmitted into a transparent prism of higher RI. We assembled a versatile experimental device that may be recognized as an Abbe-type refractometer in which the sample is illuminated from the prism side and use it to measure the intensity profile of diffuse light refracted into the prism around the critical angle. By fitting a recently proposed theoretical model we extract the complex RI of turbid suspensions of particles from the measured intensity profiles. We show that the real part of the effective RI is readily obtained with good precision regardless of how the sample is illuminated, whereas obtaining the imaginary part is done with less precision but nevertheless useful measurements can be obtained. The effective RI obtained with this method compares very well with the so-called van de Hulst effective RI and the one derived from Keller's model of the effective propagation constant.

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“…The magnetite particles were obtained by means of chemical co-precipitation method. The particle volume fraction of the sample was 2%, small enough to neglect both particle clustering [6] and multiple scattering [7], and thus to stay within the applicability limits of Eqs. (2) and (3).…”

Section: Resultsmentioning

confidence: 99%

The influence of the Néel rotation on the magnetic induced dichroism in magnetic fluids

Socoliuc

Bica

2005

Journal of Magnetism and Magnetic Materials

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Theoretical and experimental investigation of the extinction in a dense distribution of particles: nonlocal effects

Cited by 26 publications

References 18 publications

A literature review and novel theoretical approach on the optical properties of whole blood

A literature review and novel theoretical approach on the optical properties of whole blood

Refractive index measurement of turbid media by transmission of backscattered light near the critical angle

The influence of the Néel rotation on the magnetic induced dichroism in magnetic fluids

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