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Full-Text Articles in Engineering
A Model For Scattering In Dense Clouds, Richard A. Leblanc
A Model For Scattering In Dense Clouds, Richard A. Leblanc
Retrospective Theses and Dissertations
Lights is almost always detected by its interaction with matter. One of these interaction phenomena is the scattering of light by small particles. A model is developed that estimates the amount of energy that is scattered towards a detector from a beam given the locations of the source, detector and particle. This collection of particles is allowed to be very dense so that a photon scattered from the beam can be scattered several times before leaving the scattering medium. By considering the single-scatter component and multiple-scatter component separately, the model retains the characteristics of both types.
A Non-Contact Technique For Direct Strain Measurement Using Laser Speckle Spectral Density, Reza M. Sheikhrezai
A Non-Contact Technique For Direct Strain Measurement Using Laser Speckle Spectral Density, Reza M. Sheikhrezai
Retrospective Theses and Dissertations
When an optically rough surface is illuminated by laser, a grainy pattern is produced at a distance away from the surface, which is known as laser speckle pattern. This pattern is random in intensity with its grains separated by an average amount controlled by the intermediate optical system or the diameter of the illuminated area of the surface in absence of an optical system. It has been shown that the grain spacing of such pattern may be correlated to yield a singly-peaked power spectral density of an intensity ensemble which is found by spatial ensemble averages. This correlation holds only …