The impact of algal fluorescence on the underwater polarized light field

2010 ◽  
Author(s):  
A. Tonizzo ◽  
A. Ibrahim ◽  
J. Zhou ◽  
A. Gilerson ◽  
B. Gross ◽  
...  
Keyword(s):  
Light Field ◽  
Polarized Light ◽  
The Impact

The Impact of Light Polarisation on Light Field of Scenes with Multiple Reflections

2020 ◽  
pp. 108-115 ◽  
Author(s):  
Vladimir P. Budak ◽  
Anton V. Grimaylo
Keyword(s):  
Mathematical Model ◽  
Light Field ◽  
Global Illumination ◽  
Multiple Reflections ◽  
Software Environment ◽  
The Monte Carlo Method ◽  
Mueller Matrices ◽  
Volume Integration ◽  
The Impact

The article describes the role of polarisation in calculation of multiple reflections. A mathematical model of multiple reflections based on the Stokes vector for beam description and Mueller matrices for description of surface properties is presented. On the basis of this model, the global illumination equation is generalised for the polarisation case and is resolved into volume integration. This allows us to obtain an expression for the Monte Carlo method local estimates and to use them for evaluation of light distribution in the scene with consideration of polarisation. The obtained mathematical model was implemented in the software environment using the example of a scene with its surfaces having both diffuse and regular components of reflection. The results presented in the article show that the calculation difference may reach 30 % when polarisation is taken into consideration as compared to standard modelling.

Steady state of atoms in a monochromatic elliptically polarized light field

1998 ◽  
Vol 44 (1) ◽  
pp. 20-24 ◽  
Author(s):  
G Nienhuis ◽  
A. V Taichenachev ◽  
A. M Tumaikin ◽  
V. I Yudin
Keyword(s):  
Steady State ◽  
Light Field ◽  
Polarized Light ◽  
Elliptically Polarized Light ◽  
Elliptically Polarized

Effect of magnesium oxysulfate (MOS) morphology on the crystallization, mechanical, and rheological properties of polypropylene/MOS composites

2018 ◽  
Vol 32 (5) ◽  
pp. 710-726 ◽  
Author(s):  
Li Dang ◽  
Xueying Nai ◽  
Xin Liu ◽  
Zhihui Lv ◽  
Wu Li
Keyword(s):  
Rheological Properties ◽  
Polarized Light ◽  
Mechanical Tests ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Small Amplitude Oscillatory Shear ◽  
Blending Method ◽  
Magnesium Oxysulfate ◽  
Significant Yield ◽  
The Impact

Polypropylene (PP) composites containing magnesium oxysulfate particle (MOSp), magnesium oxysulfate whisker (MOSw), or magnesium oxysulfate sector (MOSs) were prepared via melt blending method. Scanning electron microscopy results showed that three magnesium oxysulfate (MOS) fillers all dispersed homogeneously in PP matrix and displayed vague and fuzzy interfaces. Wide-angle X-ray diffraction (WXRD) patterns showed that MOSp induced the most amount of β-PP, which was supported by polarized light microscopy (PLM) photographs. Moreover, PLM photographs also showed that the presence of MOSp, MOSw, or MOSw decreased the PP spherulites, especially for MOSp. As such, mechanical tests showed that incorporation of MOSp into PP matrix greatly improved the impact strength and least lowered the nominal strain at break. The yield strength and Young’s modulus of composites were greatly enhanced with MOSw. Two possible reasons for this phenomenon are rigidity of MOSw and microstructure of composites. Rheological properties were measured via small amplitude oscillatory shear. The results showed that PP melts containing MOSw exhibited significant yield stress and “shear-thinning” behaviors, which indicated the formation of MOSw network and the transition from “liquid-like” PP matrix to “solid-like” composites. The rheological results greatly proved the enhancement in tensile properties of MOSw-incorporated composites.

A polarized light field microscope with fast polarization switcher and microlens array reveals the 3-D birefringence distribution of complex anisotropic structures

2008 ◽  
Vol 14 (S2) ◽  
pp. 742-743
Author(s):  
R Oldenbourg
Keyword(s):  
New Mexico ◽  
Light Field ◽  
Polarized Light ◽  
Microlens Array ◽  
Anisotropic Structures ◽  
Fast Polarization

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

scholarly journals Observation of non-principal plane neutral points in the in-water upwelling polarized light field

2011 ◽  
Vol 19 (7) ◽  
pp. 5942 ◽  
Author(s):  
Kenneth J. Voss ◽  
Arthur C. R. Gleason ◽  
Howard R. Gordon ◽  
George W. Kattawar ◽  
Yu You
Keyword(s):  
Light Field ◽  
Polarized Light ◽  
Principal Plane

scholarly journals An unsuccessful attempt to elicit orientation responses to linearly polarized light in hatchling loggerhead sea turtles ( Caretta caretta )

2011 ◽  
Vol 366 (1565) ◽  
pp. 757-762 ◽  
Author(s):  
Lydia M. Mäthger ◽  
Kenneth J. Lohmann ◽  
Colin J. Limpus ◽  
Kerstin A. Fritsches
Keyword(s):  
Light Field ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Sea Turtles ◽  
Polarized Light ◽  
Caretta Caretta ◽  
Polarization Sensitivity ◽  
Light Perception ◽  
Unsuccessful Attempt ◽  
Swimming Direction

Sea turtles undertake long migrations in the open ocean, during which they rely at least partly on magnetic cues for navigation. In principle, sensitivity to polarized light might be an additional sensory capability that aids navigation. Furthermore, polarization sensitivity has been linked to ultraviolet (UV) light perception which is present in sea turtles. Here, we tested the ability of hatchling loggerheads ( Caretta caretta ) to maintain a swimming direction in the presence of broad-spectrum polarized light. At the start of each trial, hatchling turtles, with their magnetic sense temporarily impaired by magnets, successfully established a steady course towards a light-emitting diode (LED) light source while the polarized light field was present. When the LED was removed, however, hatchlings failed to maintain a steady swimming direction, even though the polarized light field remained. Our results have failed to provide evidence for polarized light perception in young sea turtles and suggest that alternative cues guide the initial migration offshore.

Magneto-optical resonances in elliptically polarized light field

2006 ◽  
Author(s):  
D. V. Brazhnikov ◽  
A. V. Taichenachev ◽  
A. M. Tumaikin ◽  
V. I. Yudin ◽  
S. A. Zibrov ◽  
...  
Keyword(s):  
Light Field ◽  
Polarized Light ◽  
Optical Resonances ◽  
Elliptically Polarized Light ◽  
Elliptically Polarized

scholarly journals The influence of material colors on the effective color rendering and temperature through mutual illumination

2020 ◽  
Vol 2020 (28) ◽  
pp. 293-298
Author(s):  
Cehao Yu ◽  
Sylvia Pont
Keyword(s):  
Spectral Properties ◽  
Light Field ◽  
Color Temperature ◽  
Light Fields ◽  
Lighting Technology ◽  
Complex Scenes ◽  
Spatial Geometry ◽  
Color Rendering ◽  
The Impact

In complex scenes, the light reflected by surfaces causes secondary illumination, which contributes significantly to the actual light in the space (the "light field"). Secondary illumination is dependent on the primary illumination, geometry, and materials of a space. Hence, primary illumination and secondary illumination can have non-identical spectral properties, and render object colors differently. Lighting technology and research predominantly relies on the color rendering properties of the illuminant. Little attention has been given to the impact of secondary illumination on the "effective color rendering" within light fields. Here we measure the primary and secondary illumination for a simple spatial geometry and demonstrate empirically their differential "effective color rendering" properties. We found that color distortions due to secondary illumination from chromatic furnishing materials led to systematic and significant color shifts, and major differences between the lamp-specified color rendition and temperature and the actual light-based "effective color rendering" and "effective color temperature". On the basis of these results we propose a methodological switch from assessing the color rendering and temperature of illuminants only to assessing the "effective color rendering and temperature" in context too.

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