Estimation of Orientation and Optical Properties of Plane Crystals by Polarization Characteristics of Lidar Returns

2016 ◽  
Vol 685 ◽  
pp. 613-617
Author(s):  
Olga V. Shefer ◽  
Olga V. Rozhneva ◽  
Vitaliy V. Loskutov
Keyword(s):  
Optical Properties ◽  
Iterative Algorithm ◽  
Stokes Parameters ◽  
Physical Optics ◽  
Model Medium ◽  
Space Orientation ◽  
Calculation Technique ◽  
Polarization Characteristics ◽  
Oriented Plane

Under the method of physical optics, there presented a calculation technique of the Stokes parameters ratios to study the polarization characteristics of lidar returns. An ensemble of preferentially oriented plane crystals is considered as a model medium. The iterative algorithm to estimate the optical properties of the particles and its space orientation using the Stokes parameters ratios is presented.

Characteristics Detection Method for Material Surface Based on Polarization Vision Information

2014 ◽  
Vol 1006-1007 ◽  
pp. 747-751
Author(s):  
Rong Hua Li ◽  
Bao Zhang Qu ◽  
Feng Xiang Zhai ◽  
Ying Zhou
Keyword(s):  
Mineral Resources ◽  
Surface Characteristics ◽  
Stokes Parameters ◽  
Material Surface ◽  
Polarization Vision ◽  
Intensity Measurements ◽  
Three Samples ◽  
Ordinary Light ◽  
Acquisition Device ◽  
Polarization Characteristics

Comparing to ordinary light intensity measurements, polarization measurements have many advantages in studying the surface，atmosphere and exploring space. In order to obtain high-quality polarization information, the paper designs a three-channel synchronous acquisition device. It researches the feasibility of obtaining the characteristics information of material surface by polarization vision. It respectively measures the leaves, automobiles, cement wall these three samples’ reflected light’s polarization characteristics using the method of getting Stokes parameters. The experimental results show that the polarization characteristics have a great relationship with the characteristics of target, the measurement wavelength and the viewing angle. The method mentioned in this paper is vital to achieving material surface characteristics. At the same time , it provides a new way for geology and mineral resources exploration.

scholarly journals The differential equations of Fresnel's polarisation-vector, with an extension to the case of active media

1902 ◽  
Vol 70 (459-466) ◽  
pp. 37-43
Keyword(s):  
Optical Properties ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Physical Optics ◽  
Obvious Advantage ◽  
Active Media ◽  
The Media

1. In many problems of physical optics it becomes necessary to know the differential equations that the polarisation-vector of a stream of light has to satisfy, and the boundary conditions that subsist at the interface of media possessing different optical properties. These are usually obtained by formulating some theory respecting the character of the ether in the media and the nature of the vibrations in a train of waves, but there is an obvious advantage in directly basing our investigations, if possible, on the known experimental laws of the propagation of a luminous disturbance.

scholarly journals Morphological Modification and Analysis of ZnO Nanorods and Their Optical Properties and Polarization

Scanning ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Nandang Mufti ◽  
Siti Maryam ◽  
Anggun A. Fibriyanti ◽  
Robi Kurniawan ◽  
Abdulloh Fuad ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
High Performance ◽  
Zno Nanorods ◽  
High Concentration ◽  
Zinc Interstitial ◽  
Morphological Modification ◽  
Polarization Characteristics ◽  
High Optical Absorption ◽  
Insight Into

We report on the effect of the morphological modification on optical properties and polarization of ZnO nanorods (NR). Here, the morphology and structure of the ZnO NR were modified by introducing different annealing temperatures. The increase of length and diameter and change in density of the ZnO NR were clearly observed by increasing the annealing temperature. We found that the samples show different oxygen vacancy (VO) and zinc interstitial (ZnI) concentrations. We suggest that the different concentrations of VO and ZnI are originated from morphological and structural modification. Our results reveal that optical absorption and polarization of ZnO NR could be enhanced by producing a high concentration of VO and ZnI. The modification of VO and ZnI promotes a decrease in the band gap and coexistence of high optical absorption and polarization in our ZnO NR. Our findings would give a broad insight into the morphological modification and characterization technique on ZnO NR. The high optical and polarization characteristics of ZnO NR are potential for developing the high-performance nanogenerator device for multitype energy harvesting.

scholarly journals A Massive Sample of Radio Spectral Indices for AGN in the JVLA FIRST Survey

2013 ◽  
Vol 9 (S304) ◽  
pp. 70-70
Author(s):  
Bob Becker
Keyword(s):  
Optical Properties ◽  
Spectral Index ◽  
Stokes Parameters ◽  
Spectral Indices ◽  
Survey Area ◽  
Photometric Redshifts ◽  
Massive Sample

AbstractThe final 800 sq. deg of sky covered by FIRST was observed with the new, improved JVLA. The data were split between two bandpasses at 1335 and 1730 MHz and included all four Stokes parameters, thus allowing both spectral and polarimetric results. The lower frequency bandpass data were considered part of FIRST and are available through the FIRST website (http://sundog.stsci.edu/). Here we present the higher frequency bandpass data as pertain to AGN. Foremost, we present spectral index results for the 5000 quasars with spectroscopic redshifts and the 50,000 quasars with photometric redshifts that fall in the survey area. The spectral indices are analyzed as a function of redshift and optical properties both for quasars detected above the 1 mJy limit and, via image stacking, for quasars at flux densities down to 10 mJy.

Engineering the morphology and optical properties of InP-based InAsSb/InGaAs nanostructures via Sb exposure and graded growth techniques

2013 ◽  
Vol 1509 ◽  
Author(s):  
W. Lei ◽  
H.H. Tan ◽  
C. Jagadish
Keyword(s):  
Optical Properties ◽  
Buffer Layer ◽  
Mole Fraction ◽  
Strain Energy ◽  
Shape Change ◽  
Interface Energy ◽  
Polarization Characteristics ◽  
Self Assembled

ABSTRACTTwo growth techniques - antimony exposure and graded growth, were proposed to achieve the control over the morphology and optical properties of self-assembled InAsSb/InGaAs/InP nanostructures. By exposing the surface of InGaAs buffer layer to trimethylantimony precursor before the growth of InAsSb nanostructures, the surface/interface energy in the system is reduced, while the strain energy in the system is enhanced. This leads to a change of island shape from dot structure to wire structure. By using a higher initial mole fraction of trimethylantimony precursor during the graded growth of InAsSb, more Sb can be incorporated into the InAsSb islands despite the same Sb mole fraction averaged over the graded growth. This also results in a shape change from dot to wire structure. As a result of their shape change, photoluminescence from the InAsSb nanostructures shows different polarization characteristics.

Design of objective lens for 200-kV high-resolution electron microscopes

1983 ◽  
Vol 41 ◽  
pp. 314-315
Author(s):  
K. Tsuno ◽  
T. Honda ◽  
Y. Harada ◽  
M. Naruse
Keyword(s):  
Optical Properties ◽  
Computer Technology ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Resolution Electron ◽  
Correction Of Astigmatism ◽  
Three Stages ◽  
Electron Microscopes ◽  
Stage 1

Developement of computer technology provides much improvements on electron microscopy, such as simulation of images, reconstruction of images and automatic controll of microscopes (auto-focussing and auto-correction of astigmatism) and design of electron microscope lenses by using a finite element method (FEM). In this investigation, procedures for simulating the optical properties of objective lenses of HREM and the characteristics of the new lens for HREM at 200 kV are described.The process for designing the objective lens is divided into three stages. Stage 1 is the process for estimating the optical properties of the lens. Firstly, calculation by FEM is made for simulating the axial magnetic field distributions Bzc of the lens. Secondly, electron ray trajectory is numerically calculated by using Bzc. And lastly, using Bzc and ray trajectory, spherical and chromatic aberration coefficients Cs and Cc are numerically calculated. Above calculations are repeated by changing the shape of lens until! to find an optimum aberration coefficients.

Optical Properties of HVEM Accelerators

1975 ◽  
Vol 33 ◽  
pp. 180-181
Author(s):  
A. Strojnik ◽  
J.W. Scholl ◽  
V. Bevc
Keyword(s):  
Optical Properties ◽  
Electron Accelerator ◽  
Systematic Investigation ◽  
Electron Source ◽  
High Brightness ◽  
The Past ◽  
Wide Range ◽  
Optical Behavior

The electron accelerator, as inserted between the electron source (injector) and the imaging column of the HVEM, is usually a strong lens and should be optimized in order to ensure high brightness over a wide range of accelerating voltages and illuminating conditions. This is especially true in the case of the STEM where the brightness directly determines the highest resolution attainable. In the past, the optical behavior of accelerators was usually determined for a particular configuration. During the development of the accelerator for the Arizona 1 MEV STEM, systematic investigation was made of the major optical properties for a variety of electrode configurations, number of stages N, accelerating voltages, 1 and 10 MEV, and a range of injection voltages ϕ0 = 1, 3, 10, 30, 100, 300 kV).

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

A transmission electron microscopic study of structural transitions in fast ionic conductors

1987 ◽  
Vol 45 ◽  
pp. 156-157
Author(s):  
R. B. Queenan ◽  
P. K. Davies
Keyword(s):  
Optical Properties ◽  
Ionic Conduction ◽  
Recent Observation ◽  
Ionic Conductivities ◽  
Sodium Aluminate ◽  
Two Dimensions ◽  
Ionic Conductors ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Trivalent Cations

Na ß“-alumina (Na1.67Mg67Al10.33O17) is a non-stoichiometric sodium aluminate which exhibits fast ionic conduction of the Na+ ions in two dimensions. The Na+ ions can be exchanged with a variety of mono-, di-, and trivalent cations. The resulting exchanged materials also show high ionic conductivities.Considerable interest in the Na+-Nd3+-ß“-aluminas has been generated as a result of the recent observation of lasing in the pulsed and cw modes. A recent TEM investigation on a 100% exchanged Nd ß“-alumina sample found evidence for the intergrowth of two different structure types. Microdiffraction revealed an ordered phase coexisting with an apparently disordered phase, in which the cations are completely randomized in two dimensions. If an order-disorder transition is present then the cooling rates would be expected to affect the microstructures of these materials which may in turn affect the optical properties. The purpose of this work was to investigate the affect of thermal treatments upon the micro-structural and optical properties of these materials.

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