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ABSTRACT Fiber optics produced by special methods from silica glass and quartz which replaced copper wire is very useful in telecommunications long distance telephone lines and in examining internal parts of the body endoscopy Equipment for photography is available with all current fiber-optic endoscopes Through a process known as total internal reflection light rays beamed into the fiber can propagate within the core for great distances with remarkably little attenuation or reduction in intensity In general the methods of fiber production fall into three categories a the extrusion method for synthetic fibers b hot drawing of fibers from molten bulk material through an orifice and c drawing of uncoated coated and multiple fibers from assemblies of rods and tubes fed through a hollow cylindrical furnace Three forms of fiber optics components have been proposed for the improvement of the image quality field angle and photographic speed of various types of optical systems These fiber optics elements in the form of a field flattener a conical condenser and distortion corrector can be used separately or combined into a single unit called a Focon LIST OF FIGURES Figure 21Photograph of the earliest bundle of uncoated aligned fibers Page 7 Figure 31Core of a step index fiber Page 8 Figure 32Schematic diagram of a typical fiber drawing Page 9 Figure 33Preform manufacturing apparatus used in Silica-Quartz Page 11 Figure 34Comparison of staticdynamic and spitial filtering imagery Page 12 Figure 41 Field flattener system of photography Page 13 Figure 42 Showing the image transmission through a conical fiber bundle Page 14 Figure 43 Fiber optics distortion correctors Page 14 Figure 44 Limiting resolution of Focon system Page 15 Figure 51 Single lens reflex camera Page 16 TABLE OF CONTENTS 1 INTRODUCTION 2 HISTORY OF FIBER OPTICS 3 WHAT IS FIBER OPTICS 31 WHAT IS SILICA 32 WHAT IS QUARTZ 33 WHAT IS ENDOSCOPIC PHOTOGRAPHY 4 ENDOSCOPIC PHOTOGRAPHY
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