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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Proceedings ArticleDOI
Light interaction with human skin: from believable images to predictable models
TL;DR: This course addresses an important topic in this area, namely the predictive simulation of skin's appearance, and can be also applied to the rendering of other organic materials such as hair and ocular tissues.
Proceedings ArticleDOI
Physical-mathematical model of optical radiation interaction with biological tissues
T. I. Kozlovska,Peter F. Kolisnik,Sergey M. Zlepko,Natalia V. Titova,V.S. Pavlov,Waldemar Wójcik,Zbigniew Omiotek,Miergul Kozhambardiyeva,Aizhan Zhanpeisova +8 more
TL;DR: In this paper, the authors presented a model and supporting experiments confirming the contribution of skin inhomogeneity to the morphology of PPG waveforms, which allows determining the change of intensity of optical radiation depending on such parameters as installation angle of the sensor, biological tissue thickness and the wavelength.
Journal ArticleDOI
Effect of pressing and impacting bruises on optical properties of kiwifruit flesh
TL;DR: In this article, the effect of bruises on the optical properties of kiwifruit was investigated by using an integrating sphere system in 950−1650 nm in 16 d after bruising and the results indicated that bruised samples had higher absorption coefficient than non-bruised ones, but there was no significant difference (P ≤ 0.05).
Journal ArticleDOI
Validation of speed-resolved laser Doppler perfusion in a multimodal optical system using a blood-flow phantom.
TL;DR: The presented results show that the PeriFlux 6000 EPOS system can accurately discriminate blood perfusion originating from different blood-flow speeds, which may enable improved measurement of healthy and dysfunctional microcirculatory flow.
Journal ArticleDOI
Relationship of the bulk optical properties in 950–1650 nm wavelength range with internal quality and microstructure of kiwifruit during maturation
TL;DR: In this paper, the relationship between bulk optical properties and internal quality/microstructure of kiwifruit during maturation is investigated using a single integrating sphere and inverse adding-doubling technique over the wavelength range of 950-1650nm.
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.