Journal ArticleDOI
Determining the optical properties of turbid media by using the adding–doubling method
TLDR
A method is described for finding the optical properties of a slab of turbid material by using total reflection, unscattered transmission, and total transmission measurements and the intrinsic error in the method is < 3% when four quadrature points are used.Abstract:
A method is described for finding the optical properties (scattering, absorption, and scattering anisotropy) of a slab of turbid material by using total reflection, unscattered transmission, and total transmission measurements. This method is applicable to homogeneous turbid slabs with any optical thickness, albedo, or phase function. The slab may have a different index of refraction from its surroundings and may or may not be bounded by glass. The optical properties are obtained by iterating an adding–doubling solution of the radiative transport equation until the calculated values of the reflection and transmission match the measured ones. Exhaustive numerical tests show that the intrinsic error in the method is <3% when four quadrature points are used.read more
Citations
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Applied problems and computational methods in radiative transfer
TL;DR: In this paper, the authors investigated the light scattering in turbid media for various applications such as paper and print, computer rendering, optical tomography, astrophysics and remote sensing.
Journal ArticleDOI
Diffused light attenuation at 664 nm for PDT in salted cadaver brain
Emiyu Ogawa,Jiro Akimoto,Shinjiro Fukami,Shogo Hayashi,Michihiro Kohno,Marika Doi,Risa Hamada,Haruna Nakazawa,Aki Miyashita,Tsunenori Arai +9 more
TL;DR: As conventional spectroscopic measurement may overestimate attenuation in the whole tissue, in situ measurement using the withdrawal technique might be appropriate for measurement of inhomogeneous biological tissues.
Patent
Determining biological tissue optical properties via integrating sphere spatial measurements
Justin S. Baba,Brian Letzen +1 more
TL;DR: In this paper, a light-occluding slider is used to block diffuse scattering from the front of an optical sample mounted on a spatial-acquisition apparatus that is placed in or on an enclosure, where specular reflection is allowed to escape from the enclosure through an opening.
Journal ArticleDOI
Diagnosing different types of skin carcinoma based on their optical properties: A Monte-Carlo implementation
Omnia Hamdy,Ibrahim Abdelhalim +1 more
TL;DR: The obtained results provided information about the amount of light reflectance, transmittance, absorbed fraction and fluence rate distribution in the examined tissues showing different values at each condition over a wide range of wavelengths, which provide a simple, safe and functional tool for diagnosing these categories of skin carcinoma.
Proceedings ArticleDOI
Simulation of white LEDs with a planar luminescent layer using the extended Adding-Doubling method
TL;DR: In this article, the authors presented a new simulation method to predict the performance of various white LED packages with a planar phosphor layer using the extended adding-Doubling method.
References
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Journal ArticleDOI
A simplex method for function minimization
John A. Nelder,R. Mead +1 more
TL;DR: A method is described for the minimization of a function of n variables, which depends on the comparison of function values at the (n 41) vertices of a general simplex, followed by the replacement of the vertex with the highest value by another point.
Book
Introduction to Numerical Analysis
Josef Stoer,Roland Bulirsch +1 more
TL;DR: This well written book is enlarged by the following topics: B-splines and their computation, elimination methods for large sparse systems of linear equations, Lanczos algorithm for eigenvalue problems, implicit shift techniques for theLR and QR algorithm, implicit differential equations, differential algebraic systems, new methods for stiff differential equations and preconditioning techniques.
Journal ArticleDOI
A review of the optical properties of biological tissues
TL;DR: The known optical properties (absorption, scattering, total attenuation, effective attenuation and/or anisotropy coefficients) of various biological tissues at a variety of wavelengths are reviewed in this article.
Journal ArticleDOI
New contributions to the optics of intensely light-scattering materials.
TL;DR: In this paper, the Gurevic and Judd formulas were derived from the Kubelka-Munk differential equations, and they are exact under the same conditions as in this paper, that is, when the material is perfectly dull and when the light, is perfectly diffused or if it is parallel and hits the specimen under an angle of 60° from normal.