Keywords

Laser speckle, Laser spectroscopy

Abstract

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 if the sampling is done in a plane referred to as the constant plane. On an average basis such a characteristic peak persists with an in-plane rigid-body motion of the test object and within a uniformly rough area of the surface. The behavior of such peak with an induced in-plane strain is shown to be non-linear and of second order for the test range, when frequency values of such peak is plotted versus strain. Further, the slope of such curve changes sign when a strain of opposite sign is sensed. Finally, the best responses were obtained when no intermediate optical system was employed in the observation field.

Notes

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Graduation Date

1984

Semester

Fall

Advisor

Moslehy, Faissal A.

Degree

Master of Science (M.S.)

College

College of Engineering

Degree Program

Engineering

Format

PDF

Pages

146 p.

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0015866

Accessibility Status

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Engineering Commons

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