Light propagation in tissues with controlled optical properties

1997 ◽  
Vol 2 (4) ◽  
pp. 401 ◽  
Author(s):  
Valery V. Tuchin
Keyword(s):  
Optical Properties ◽  
Light Propagation ◽  
Light Propagation In Tissues

Light propagation in tissues with controlled optical properties

1996 ◽  
Author(s):  
Valery V. Tuchin ◽  
Irina L. Maksimova ◽  
Dmitry A. Zimnyakov ◽  
Irina L. Kon ◽  
Albert K. Mavlutov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Light Propagation ◽  
Light Propagation In Tissues

scholarly journals Measuring light scattering and absorption in corals with Inverse Spectroscopic Optical Coherence Tomography (ISOCT): a new tool for non-invasive monitoring

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
G. L. C. Spicer ◽  
A. Eid ◽  
D. Wangpraseurt ◽  
T. D. Swain ◽  
J. A. Winkelmann ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Properties ◽  
Light Scattering ◽  
Light Propagation ◽  
Coral Tissue ◽  
Coral Host ◽  
Invasive Monitoring ◽  
Optical Coherence ◽  
Invasive Approach ◽  
Non Invasive

Abstract The success of reef-building corals for >200 million years has been dependent on the mutualistic interaction between the coral host and its photosynthetic endosymbiont dinoflagellates (family Symbiodiniaceae) that supply the coral host with nutrients and energy for growth and calcification. While multiple light scattering in coral tissue and skeleton significantly enhance the light microenvironment for Symbiodiniaceae, the mechanisms of light propagation in tissue and skeleton remain largely unknown due to a lack of technologies to measure the intrinsic optical properties of both compartments in live corals. Here we introduce ISOCT (inverse spectroscopic optical coherence tomography), a non-invasive approach to measure optical properties and three-dimensional morphology of living corals at micron- and nano-length scales, respectively, which are involved in the control of light propagation. ISOCT enables measurements of optical properties in the visible range and thus allows for characterization of the density of light harvesting pigments in coral. We used ISOCT to characterize the optical scattering coefficient (μs) of the coral skeleton and chlorophyll a concentration of live coral tissue. ISOCT further characterized the overall micro- and nano-morphology of live tissue by measuring differences in the sub-micron spatial mass density distribution (D) that vary throughout the tissue and skeleton and give rise to light scattering, and this enabled estimates of the spatial directionality of light scattering, i.e., the anisotropy coefficient, g. Thus, ISOCT enables imaging of coral nanoscale structures and allows for quantifying light scattering and pigment absorption in live corals. ISOCT could thus be developed into an important tool for rapid, non-invasive monitoring of coral health, growth and photophysiology with unprecedented spatial resolution.

Measurement of Optical Properties for Light Propagation Simulation on Skin Tissue

2003 ◽  
Vol 2003.15 (0) ◽  
pp. 123-124
Author(s):  
Tomohiro Ota ◽  
Masatoshi Tarumi ◽  
Hidenobu Arimoto ◽  
Miho Shimada ◽  
Yukio Yamada
Keyword(s):  
Optical Properties ◽  
Light Propagation ◽  
Skin Tissue

scholarly journals Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships

2013 ◽  
Vol 10 (3) ◽  
pp. 4025-4065 ◽  
Author(s):  
D. Antoine ◽  
S. B. Hooker ◽  
S. Belanger ◽  
A. Matsuoka ◽  
M. Babin
Keyword(s):  
Remote Sensing ◽  
Optical Properties ◽  
Water Column ◽  
Light Propagation ◽  
Beaufort Sea ◽  
The Arctic ◽  
Ocean Colour ◽  
Data Set ◽  
Turbid Waters ◽  
Kd Values

Abstract. A data set of radiometric measurements collected in the Beaufort Sea (Canadian Arctic) in August 2009 (MALINA project) is analysed in order to describe apparent optical properties (AOPs) in this sea, which is subject to dramatic environmental changes for several decades. The two properties derived from the measurements are the spectral diffuse attenuation coefficient for downward irradiance, Kd, and the spectral remote sensing reflectance, Rrs. The former controls light propagation in the upper water column. The latter determines how light is backscattered out of the water and becomes eventually observable from a satellite ocean colour sensor. The data set includes offshore clear waters of the Beaufort basin as well as highly turbid waters of the Mackenzie River plumes. In the clear waters, we show Kd values that are much larger in the ultraviolet and blue parts of the spectrum than what could be anticipated considering the chlorophyll concentration. A larger contribution of absorption by coloured dissolved organic matter (CDOM) is responsible for this high Kd values, as compared to other oligotrophic areas. In turbid waters, attenuation reaches extremely high values, driven by high loads of particulate materials and also by a large CDOM content. In these two extreme types of waters, current satellite chlorophyll algorithms fail. This is questioning the role of ocean colour remote sensing in the Arctic when Rrs from only the blue and green bands are used. Therefore, other parts of the spectrum (e.g. the red) should be explored if one aims at quantifying interannual changes in chlorophyll in the Arctic from space. The very peculiar AOPs in the Beaufort Sea also advocate for developing specific light propagation models when attempting to predict light availability for photosynthesis at depth.

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