Derivation of absorption coefficient and reduced scattering coefficient with edge-loss method and comparison with video reflectometry method

2016 ◽  
Vol 23 (4) ◽  
pp. 579-586
Author(s):  
Kenichiro Yoshida
Keyword(s):  
Absorption Coefficient ◽  
Scattering Coefficient ◽  
Loss Method ◽  
Reduced Scattering Coefficient

Noninvasive determination of absorption coefficient and reduced scattering coefficient of human skin tissues in vivo with oblique-incidence reflectometry

2008 ◽  
Vol 6 (12) ◽  
pp. 932-934 ◽  
Author(s):  
孙萍 Ping Sun ◽  
王瑜 Yu Wang ◽  
莫晓丽 Xiaoli Mo ◽  
谢敬辉 Jinghui Xie
Keyword(s):  
Absorption Coefficient ◽  
Human Skin ◽  
Oblique Incidence ◽  
Scattering Coefficient ◽  
Reduced Scattering Coefficient

scholarly journals Оптические свойства in vitro катарактальных хрусталиков глаза человека в видимом и ближнем ИК диапазонах-=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (5) ◽  
pp. 656
Author(s):  
А.В. Беликов ◽  
А.М. Загорулько ◽  
С.Н. Смирнов ◽  
А.Н. Сергеев ◽  
А.А. Михайлова ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Spectral Range ◽  
Anisotropy Factor ◽  
Optical Characteristics ◽  
Scattering Coefficient ◽  
Eye Lens ◽  
Human Eye ◽  
Scattering Anisotropy ◽  
Reduced Scattering Coefficient

Spectral dependences of absorption coefficient, scattering coefficient, anisotropy factor and reduced scattering coefficient for in vitro human eye lenses of different cataract type are investigated. The spectra of absorption coefficient and reduced scattering coefficient were obtained for the spectral range 400-2300 nm, and the spectra of scattering coefficient and scattering anisotropy factor - for the spectral range 400-1800 nm. The regions of wavelengths within which the spectra of the studied optical characteristics of the human eye lens are not statistically significantly different for samples with different stages of cataract maturity and, conversely, within which they are statistically significantly different, are determined.

scholarly journals Development of a diffuse reflectance probe for in situ measurement of inherent optical properties in sea ice

2021 ◽  
Vol 15 (9) ◽  
pp. 4483-4500
Author(s):  
Christophe Perron ◽  
Christian Katlein ◽  
Simon Lambert-Girard ◽  
Edouard Leymarie ◽  
Louis-Philippe Guinard ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Sea Ice ◽  
Diffuse Reflectance ◽  
Scattering Coefficient ◽  
Scattering Medium ◽  
Inherent Optical Properties ◽  
Reduced Scattering Coefficient

Abstract. Detailed characterization of the spatially and temporally varying inherent optical properties (IOPs) of sea ice is necessary to better predict energy and mass balances, as well as ice-associated primary production. Here we present the development of an active optical probe to measure IOPs of a small volume of sea ice (dm3) in situ and non-destructively. The probe is derived from the diffuse reflectance method used to measure the IOPs of human tissues. The instrument emits light into the ice by the use of an optical fibre. Backscattered light is measured at multiple distances away from the source using several receiving fibres. Comparison to a Monte Carlo simulated lookup table allows, in theory, retrieval of the absorption coefficient, the reduced scattering coefficient and a phase function similarity parameter γ, introduced by Bevilacqua and Depeursinge (1999). γ depends on the two first moments of the Legendre polynomials, allowing the analysis of the backscattered light not satisfying the diffusion regime. The depth reached into the medium by detected photons was estimated using Monte Carlo simulations: the maximum depth reached by 95 % of the detected photons was between 40±2 and 270±20 mm depending on the source–detector distance and on the ice scattering properties. The magnitude of the instrument validation error on the reduced scattering coefficient ranged from 0.07 % for the most scattering medium to 35 % for the less scattering medium over the 2 orders of magnitude we validated. Fixing the absorption coefficient and γ, which proved difficult to measure, vertical profiles of the reduced scattering coefficient were obtained with decimetre resolution on first-year Arctic interior sea ice on Baffin Island in early spring 2019. We measured values of up to 7.1 m−1 for the uppermost layer of interior ice and down to 0.15±0.05 m−1 for the bottommost layer. These values are in the range of polar interior sea ice measurements published by other authors. The inversion of the reduced scattering coefficient at this scale was strongly dependent on the value of γ, highlighting the need to define the higher moments of the phase function. This newly developed probe provides a fast and reliable means for measurement of scattering in sea ice.

Estimating Pigment Concentrations from Spectral Images Using an Encoder‐Decoder Neural Network

2020 ◽  
Vol 64 (3) ◽  
pp. 30502-1-30502-15
Author(s):  
Kensuke Fukumoto ◽  
Norimichi Tsumura ◽  
Roy Berns
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Absorption Coefficient ◽  
Spectral Data ◽  
High Accuracy ◽  
Pigment Concentration ◽  
Scattering Coefficient ◽  
A Value ◽  
Input And Output ◽  
Pigment Concentrations

Abstract A method is proposed to estimate the concentration of pigments mixed in a painting, using the encoder‐decoder model of neural networks. The model is trained to output a value that is the same as its input, and its middle output extracts a certain feature as compressed information about the input. In this instance, the input and output are spectral data of a painting. The model is trained with pigment concentration as the middle output. A dataset containing the scattering coefficient and absorption coefficient of each of 19 pigments was used. The Kubelka‐Munk theory was applied to the coefficients to obtain many patterns of synthetic spectral data, which were used for training. The proposed method was tested using spectral images of 33 paintings, which showed that the method estimates, with high accuracy, the concentrations that have a similar spectrum of the target pigments.

scholarly journals Measurement of the reduced scattering coefficient of turbid media using single fiber reflectance spectroscopy: fiber diameter and phase function dependence

2011 ◽  
Vol 2 (6) ◽  
pp. 1687 ◽  
Author(s):  
S. C. Kanick ◽  
U. A. Gamm ◽  
M. Schouten ◽  
H. J. C. M. Sterenborg ◽  
D. J. Robinson ◽  
...  
Keyword(s):  
Phase Function ◽  
Fiber Diameter ◽  
Reflectance Spectroscopy ◽  
Single Fiber ◽  
Scattering Coefficient ◽  
Turbid Media ◽  
Reduced Scattering Coefficient
Sign in / Sign up

Export Citation Format

Share Document