fiberoptics ENDOSCOPY
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 va
The resolution is then given by the reciprocal of this quantity. 55 m, indium phosphide-gallium indium arsenide phosphide (InP-GaxIn1 - xAsyP1 - y) sources are employed. 2 Schematic diagram of a typical fiber drawing Page 9Figure 3. Fotoğraf ekipmanlarında da butun fiber-optik endoskoplara kullanılmaktadır. A second method consisting of lapping the field flattener in against a metallic master. Fibre bundle technology will probably not strive to produce smaller fibres since the limit has already been nearly reached. A variety of optical connectors are used, providing both ease of use and low loss of only a few tenths of a decibel. Diagnosis is based on a complete photographic survey of the stomach, followed by careful inspection of the transparencies. 1 FIELD FLATTENERIn lens design, it is desirable that the image coincide with the Gaussian image plane so that the whole field may be in focus simultaneously. The camera lens must be focussed at infinity. This means that whatever the operator sees will be recorded photographically. Photographs are taken through the endoscope by a camera placed on the eyepiece. 1 Field flattener system of photography Page 13Figure 4.
Common topics in this essay:
B2O3 Vapour-phase,
Georgius Agricola,
FIBRES Optical,
FIELD FLATTENER,
FOCON RESOLUTION,
YAZ OKULU,
FIBRE-OPTIC ENDOSCOPES,
ABSTRACT Fiber,
ENDOSCOPIC PHOTOGRAPHY,
CONCLUSION Fibre-optic,
fiber optics,
endoscopic photography,
refractive index,
field flattener,
colour television,
silica glass,
conical condenser,
fiber bundle,
circuit colour television,
television endoscopy,
image plane,
colour television endoscopy,
conical fiber bundle,
41 field flattener,
closed circuit colour,
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Acceptance Essays
