Masters Theses

Abstract

"The random speckle intensity pattern, which is produced by the scattered optical field from a rough surface when illuminated, can be used as a carrier of information. A theoretical study is performed to use the speckle patterns for retrieving the information of various kinds of object motions. A mathematical model of speckle is developed and used to relate different speckle patterns at various intervals as the object is experiencing motion. Four different object motions, i.e., one dimensional perpendicular motion, axial motion, three-dimensional motion, and rotational motion of an object are analyzed. In each case an interference pattern is produced which reveal the velocity and the direction of object motion. Further, different speckle patterns used for analyzing a type of motion must be correlated to produce the fringes. Hence, the maximum displacement allowed for a target before its speckle patterns become uncorrelated is estimated.

A heterodyne imaging system is studied since it can be used to obtain both the magnitude and the phase of the scattered field. Also, the signal to noise ratio can be enhanced by mixing the speckle signal and strong local oscillator field in the detector plane. The system is used to produce speckle fringes through which the information regarding the scattering object is retrieved. In cases in which the target perspective greatly changes from one frame to another, the cross-correlation between the frames can be successfully used to find the information regarding the target motion"--Abstract, p. iii

Advisor(s)

Watkins, Steve E.

Committee Member(s)

Anderson, Richard A.
Moss, Randy H.

Department(s)

Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering

Publisher

University of Missouri--Rolla

Publication Date

Spring 1994

Pagination

viii, 53 pages

Note about bibliography

Includes bibliographical references (pages 50-52)

Rights

© 1994 Rathnakar Gopisetty, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 6775

Print OCLC #

31063011

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