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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Journal ArticleDOI
A partial explanation of the dependence between light scattering and light absorption in the Kubelka-Munk model
TL;DR: In this paper, the Kubelka-Munk scattering and absorption coefficients of a set of paper samples are assessed using reflectance measurements in d/0 geometry, and it is shown using general radiative transfer theory that part of this dependence can be explained and eliminated by taking into account the geometry of the D/0 instrument and the single scattering anisotropy, thus capturing the angular variations of the light reflected from the samples.
Journal ArticleDOI
Optical characterization of a laser dye in a solid state host
TL;DR: The optical properties of C18H16N2O2B2F4H2O, an organic laser dye embedded in solid plastic host, have been characterized for a number of laser wavelengths in the visible region as discussed by the authors.
Journal ArticleDOI
Modeling the efficiency of UV at 254 nm for disinfecting the different layers within N95 respirators.
Abdallatif Satti Abdalrhman,Chengjin Wang,Angelica Manalac,Madrigal Weersink,Abdul-Amir Yassine,Vaughn Betz,Benoit Barbeau,Lothar Lilge,Lothar Lilge,Ron Hofmann +9 more
TL;DR: In this article, the authors presented a Monte Carlo simulation of light transport in eight commonly used filtered facepiece respirators (FFRs) to assess the efficacy of UV at 254 nm for the inactivation of SARS-CoV-2.
Proceedings ArticleDOI
Experimental validation of an optical system for interrogation of dermally-implanted microparticle sensors
Ruiqi Long,Michael J. McShane +1 more
TL;DR: This study designed and constructed the optical part of this opto-electronic system for delivery of excitation, collection and analysis of escaping fluorescent signal, and tested the capability of the designed optical system.
Journal ArticleDOI
Multiparameter Spectrophotometry Platform for Turbid Sample Measurement by Robust Solutions of Radiative Transfer Problems
TL;DR: It is found that only the HG-based sample model yields high accuracy and strong robustness for inverse determination of RT parameters even for the cases of sphere suspensions in which the assumptions of sample uniformity and scattering by independent and single spheres are not satisfied.
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.