Measuring the reduced scattering coefficient and y with SFR spectroscopy: studying the phase function dependence (Conference Presentation)

2016 ◽  
Author(s):  
Anouk L. Post ◽  
Xu U. Zhang ◽  
Nienke Bosschaart ◽  
Ton G. Van Leeuwen ◽  
Henricus J. C. M. Sterenborg ◽  
...  
Keyword(s):  
Phase Function ◽  
Scattering Coefficient ◽  
Reduced Scattering Coefficient

scholarly journals Development of a Diffuse Reflectance Probe for In Situ Measurement of Inherent Optical Properties in Sea Ice

2021 ◽  
Author(s):  
Christophe Perron ◽  
Christian Katlein ◽  
Simon Lambert-Girard ◽  
Edouard Leymarie ◽  
Louis-Philippe Guinard ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Optical Properties ◽  
Sea Ice ◽  
Phase Function ◽  
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 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 to retrieve the absorption coefficient, the reduced scattering coefficient and a phase function similarity parameter γ, introduced by Bevilacqua and Depeursinge (1999), depending on the two first moments of the Legendre polynomials, allowing to analyze the backscattered light not satisfying the diffusion regime. Monte Carlo simulations showed that the depth cumulating 95% of the signal is between 40±2 mm 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 two orders of magnitude we validated. Vertical profiles of the reduced scattering coefficient were obtained with decimeter 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 of γ, highlighting the need to define the higher moments of the phase function. This novel developed probe provides a fast and reliable means for measurement of scattering into sea ice.

Characterization of the reduced scattering coefficient for optically thin samples: theory and experiments

2004 ◽  
Vol 6 (7) ◽  
pp. 725-735 ◽  
Author(s):  
Anikitos Garofalakis ◽  
Giannis Zacharakis ◽  
George Filippidis ◽  
Elias Sanidas ◽  
Dimitris D Tsiftsis ◽  
...  
Keyword(s):  
Scattering Coefficient ◽  
Theory And Experiments ◽  
Reduced Scattering Coefficient ◽  
Thin Samples

IMPROVE OPTICAL CLEARING OF SKIN IN VITRO WITH PROPYLENE GLYCOL AS A PENETRATION ENHANCER

2009 ◽  
Vol 02 (03) ◽  
pp. 269-278 ◽  
Author(s):  
ZHONGWEI ZHI ◽  
ZHENZHEN HAN ◽  
QINGMING LUO ◽  
DAN ZHU
Keyword(s):  
Propylene Glycol ◽  
Diffuse Reflectance ◽  
Treatment Time ◽  
Optical Transmittance ◽  
Penetration Enhancer ◽  
Penetration Enhancers ◽  
Scattering Coefficient ◽  
Optical Clearing ◽  
Reduced Scattering Coefficient

In order to enhance the optical clearing effect of topically applied optical clearing agents (OCAs), we evaluated the effect of propylene glycol (PG) as a chemical penetration enhancer (PE) on optical clearing of skin in vitro by observation and measurement of optical-transmittance and diffuse-reflectance spectra. Three OCAs, i.e., glycerol, D-sorbitol and PEG400, and two other penetration enhancers, Azone and Thiazone, were used in this study. The results indicated that the decrease of reduced scattering coefficient caused by OCA/PG was larger than that by pure OCA, and the change by OCA/water was the least after the same treatment time. There were significant differences for the reduced scattering coefficient at 630 nm after 120 min application of agents between OCA and OCA/PG. The efficacy of optical clearing caused by OCA/PG depended on the OCA itself. When PEG400 was mixed with three different PEs, we found the optical clearing were different. The penetration enhancing ability of PG was much better compared to Azone, and suboptimal to Thiazone. Also, this study provides evidence for the use of PG as a PE in order to improve skin optical clearing.

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