DESIGN OF OPTICS AND STABILIZED

MODULATION SYSTEM

FOR

LASER SCANNING HARD COPIERS

HAZEM FALAH SAKEEK

A dissertation submitted to the faculty of Science of the

Queen's University of Belfast

in partial fulfilment of the requirements for the award of the degree of

Master of Science in

Opto-electronics and Optical Information Processing.

September, 1988

ACKNOWLEDGEMENT

ABSTRACT

CHAPTER(1) INTRODUCTION

CHAPTER(2)  DESCRIPTION OF THE MAIN APPARATUS

§ 2.1 The Acousto-Optic Modulator

§ 2.2 The Scanners

§ 2.3 The Electronic Control Module

§ 2.4 The Recording Medium

CHAPTER(3)  THEORETICAL PERFORMANCE OF THE SYSTEM

§ 3.1 Gaussian Beam Propagation

§ 3.2 The Performance of the System

§ 3.2.1 The LSC Performance

§ 3.2.1 The LSHC performance

CHAPTER(4)  TELESCOPE DESIGN

§ 4.1 The Design Procedure

§ 4.2 The Criticality of Alignment

§ 4.2.1 The Effect of Displacement

§ 4.2.2 The Effect of Misalignment

§ 4.2.3 The Effect Of Decentration

CHAPTER(5)  EXPERIMENTAL METHOD, RESULTS AND DISCUSSION

§ 5.1 Focusing And Spot Size Measurements

§ 5.2 The Scanners Set-up

§ 5.3 The AOM Set-up

§ 5.4 Scanning Problem encountered and how overcome

§ 5.5 Modulating The Laser Beam

§ 5.6 Measurement Of The Gray Level

§5.6.1 The Gray Level

§5.6.2 The Linearity Check

§ 5.7 Measurement Of The MTF

§ 5.8 Taking Pictures

CHAPTER (6)  CONCLUSION AND FUTURE DEVELOPMENT

REFERENCES

 ACKNOWLEDGEMENT

  First of all, I thank GOD who in His infinite greatness, sublimely, magnanimity and kindness offered me great success both in my exams and on the final accomplishment of this dissertation.

I express my sincere gratitude and thanks to Dr.C.H.B. Mee for giving me the necessary guidance, advice, encouragement, assistance and the opportunity of having first-hand industrial working experience at the Central Electricity Generating Board, Marchwood Engineering laboratory (CEGB,MEL).

I am grateful and do extend thanks to Dr.S.Adrain, Dr.G.Malcolm, Dr.I.Armour, Mr.G.J.Hunter, Mr.E.Ormerod and Mr.D.Wright for all their help, suggestions, advice and assistance all through this period of research.

Finally, I thank the Queen's University Of Belfast, Northern Ireland, and the Marchood Engineering Laboratory, Southampton, England, for providing me with the equipment, laboratory and libraries from which material for this research were collected.

 Abstract

A critical evaluation of the performance of a conventional TV camera for iwpecting nuclear reactors is reported.  Improvements introduced on technique incorporating a laser scanning camera (LSC) including the melts and demerits are presented.

 The development of a prototype laser scanning hard copier device from computer aided optics design, acousto optic laser beam intensity modulator, scanning mirrors and their drive circuitry and photographic recording principles is described.   The theoretical performance and prediction of resolution capabilities of the present device are highlighted.   The feasibility of using such a device with existing laser scanning camera (LSC) is demonstrated.