Fiber Optics
Assignment
Many modern medical materials and equipment work on a principle which is
beyond the capacity of human transducers.
Comment and discuss the working principles of an endoscope, uteroscope
or a rectoscope showing the illuminating path, the image path, transmission path
and the liquid transfer or operating instrument ducts, showing the position of
suitable valves.
This will therefore explain how light travels through an optical fibre
and show how such fibres are used in medicinal equipment either to transmit
light or to bring back images from within a patient.
Contents
Fibre Optics
Fibre-Optic Bundles
Coherent and Incoherent ...
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days of fibre, but that have since
been answered by technical advances.
Fibre is fragile
An optical fibre has greater tensile strength than copper or steel fibres of the
same diameter. It is flexible, bends easily, and resists most corrosive
elements that attack copper cable. Optical cables can withstand pulling forces
of more than 150 pounds.
Fibre is hard to work with
This myth derives from the early days of fibre optic connectors. Early
connectors where difficult to apply; they came with many small parts that could
tax even the nimble fingered. They needed epoxy, curing, cleaving and polishing.
On top of that, the technologies of epoxy, curing, cleaving and polishing were
still evolving.
Today, connectors have fewer parts, the procedures for termination are well
understood, and the craftsperson is aided by polishing machines and curing ovens
to make the job faster and easier.
Even better, epoxyless connectors eliminate the need for the messy and time-
consuming ...
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index lower than that of the fibre
core.
As the angle of incidence I increases, R increases and O ( = (n/2) -R)
decreases. Eventually, O reaches C, the critical angle, and any further
reduction in O results in transmission through the side wall.
The expression n0 sin Imax is called the numerical aperture of the fibre. A
typical value for this might be 0.55, making Imax about 33o in air. Sometimes
Imax is referred to as the half-angle of the fibre, since it describes half
the field of view acceptably transmitted. The numerical aperture (and hence
Imax) can be increased by using a core of high refractive index. However, these
glasses have a lower efficiency of transmission, ...
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"Fiber Optics." Essayworld.com. October 6, 2008. Accessed November 23, 2024. http://www.essayworld.com/essays/Fiber-Optics/91020.
"Fiber Optics." Essayworld.com. October 6, 2008. Accessed November 23, 2024. http://www.essayworld.com/essays/Fiber-Optics/91020.
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