Ab initio intensity distribution of diffusely scattered light from rough metallic surfaces

2011 ◽  
Author(s):  
J. A. Böhm ◽  
A. Vernes ◽  
M. J. Vellekoop
Keyword(s):  
Ab Initio ◽  
Intensity Distribution ◽  
Scattered Light ◽  
Metallic Surfaces

LIGHT SCATTERING TECHNIQUES FOR DISCRIMINATING BETWEEN OIL AND PARTICULATES IN CONTAMINATED WATER

1977 ◽  
Vol 1977 (1) ◽  
pp. 153-156 ◽  
Author(s):  
Bruce Friedman
Keyword(s):  
Particulate Matter ◽  
Light Scattering ◽  
Intensity Distribution ◽  
Scattered Light ◽  
Incident Light ◽  
Real Life ◽  
The State ◽  
Oil Droplets ◽  
State Of Polarization

ABSTRACT Light scattering techniques are used in several oil-in-water monitors, proposed or in existence. Particulate matter which may interfere with these monitors is also frequently found in oily wastes. An analysis is made of the potential of using measurements of the angular intensity distribution of scattered light in conjunction with determination of the state of polarization of the scattered light for discriminating between oil and particulates. The size conditions which apply to the oil droplets and particulates relative to the incident light allow the scattered light angular intensity distribution to be treated as a consequence of a combination of classical diffraction and of geometrical refraction and reflection. The state of polarization of the scattered light for oil droplets is investigated using expressions for the electric field which are approximations to the expressions of the Mie theory. For the particulate matter, the state of polarization is probed on the basis of light reflected from a plane. It is found that it would be difficult to discriminate between oil and particulates using measurements of the angular intensity distribution of scattered light even in conjunction with the determination of the state of polarization of the scattered light in a real life situation.

Nonuniform intensity distribution of the scattered light by moving diffuser across projection lens pupil and its influence in speckle reduction

2014 ◽  
Vol 21 (1) ◽  
pp. 90-93 ◽  
Author(s):  
Yasushi Tomita ◽  
Koji Suzuki ◽  
Tatsuo Fukui ◽  
Hironori Tokita ◽  
Shigeo Kubota
Keyword(s):  
Intensity Distribution ◽  
Scattered Light ◽  
Speckle Reduction ◽  
Projection Lens

scholarly journals Etude theorique de la repartition de luminance sur le disque de Venus

1974 ◽  
Vol 65 ◽  
pp. 179-184
Author(s):  
C. Bigourd ◽  
J. L. Deuze ◽  
C. Devaux ◽  
M. Herman ◽  
J. Lenoble
Keyword(s):  
Refractive Index ◽  
Simple Model ◽  
Size Distribution ◽  
Intensity Distribution ◽  
Scattered Light ◽  
Preliminary Investigation ◽  
Polarized Light ◽  
Single Scattering ◽  
Intensity Measurements ◽  
Homogeneous Plane

The analysis of the sunlight scattered by Venus gives some insight upon its clouds. The measurements of polarized light are probably more sensitive to the nature of their constituents, and some recent studies seem to be able to give a satisfactory interpretation of this part of the scattered light. But the polarized light concerns the upper part of the clouds, and it is interesting to compare these results with intensity measurements. The phase curves, for the integrated light, leave some indeterminations, so we have studied if the intensity distribution on the Venus disk could give more accurate informations. This work, based on some plates kindly communicated by A. Dollfus, and analysed at Meudon Observatory, is more a preliminary investigation of the sensitivity of the method than an interpretation of the partial results presented. A simple model, of homogeneous plane parallel cloud, has been used, and the influence of various parameters has been tested (single scattering albedo, refractive index of particles and size distribution, optical depth of the cloud).

Simulation and Analysis of Light Scattering by Air Bubble in Optical Glass

2015 ◽  
Vol 1096 ◽  
pp. 98-102
Author(s):  
Sai Zhang ◽  
Kai Wei Wang ◽  
Fan He ◽  
Bin Zhou
Keyword(s):  
Intensity Distribution ◽  
Optical Glass ◽  
Scattered Light ◽  
Single Scattering ◽  
Mie Scattering ◽  
Intensity Pattern ◽  
Air Bubble ◽  
Optical Media ◽  
Neural Network Algorithm ◽  
Mie Scattering Theory

Mie scattering theory is used in this paper to analyze the forward scattered light intensity distribution of an air bubble in the subsurface of optical glass, shining by a monochrome laser with a wavelength of 632.8um. The scattering process can be classified as uncorrelated single scattering .according to the properties of optical media. The finite difference time domain (FDTD) software is used to establish a 3-d simulation model to calculate for forward scattered intensity distribution of different sized air bubbles. Moreover, according to the relationship between Mie scattering intensity pattern and the size of bubbles, the size of bubbles are figured out with the help of neural network algorithm. The errors are lower than 10%. The simulation results can improve the precision of defects detection in optical glass.

New Approach to Fringe Pattern Analysis Obtained by Scanning Polished Metal Cylinders with Gaussian Beam

2008 ◽  
Vol 381-382 ◽  
pp. 267-270
Author(s):  
Ryszard Jabłoński ◽  
J. Mąkowski
Keyword(s):  
Intensity Distribution ◽  
Laser Scanning ◽  
Fringe Pattern ◽  
Pattern Analysis ◽  
Scattered Light ◽  
Diffraction Field ◽  
New Approach ◽  
Close Analysis ◽  
Fringe Pattern Analysis ◽  
Polished Metal

In laser-scanning measurement of cylindrical objects extremely complex interfering signals occur. They are due to superimposition of: reflected, unobstructed and scattered light. The proportions between these components vary in time and also the total intensity distribution changes. The considerations applying Fraunhofer theory are static and fragmentary, and may be concluded that the existing solutions for diffraction of 3D bodies do not fit to engineering applications. Having the above in view, the close analysis of detector signal was carried out. The obtained differential intensity characteristics allow to determine the important metrological qualities of diffraction field.

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