312 Optical Fibers Glass of peculiarities - Eltek

- quartz glass monofibers with diameter
from 50 up to 90 micron assembled in
bundles to obtain the decided optical
diameter;
- incombustible;
- inexhaustible, unlimited duration;
- self-extinguishing PVC or Megolon
protective sheat;
- minimum bending radius from 0,5 up to 2 cm.;
- it does not conduct IR (heat) nor UV (ultraviolets-colour’s corrosion).
Composition of quartz glass optical fiber’s bundle
O.f. bundle composed by three elements::
- common end;
- o.f. tails;
- single end.
The lenght of the bundle is calculated from
the beginnig of the common end till the end of
the single end.
Common end
On the common end is highlighted the light produced by the light
source.
It collects the o.f. tails that compose the bundle which can also be of
different size (diameter).
The lenght of each tail, when requested by the project, could be different
with minimum variation of 10 cm., excluded size 1 o.f. tails for
which is possible to have max four different lenghts each bundle..
This, without cost’s increase, allows you to obtain good savings
on the comprehensive realisation of the system.
Quantity of fibers inserable in the common end
The sum of the size of each o.f. tails composing the bundle, which can
be in different size (diameter), cannot be higher than the maximum
capacity, expressed in size, preview from the focalisation of the selected
light source:
0199 standard common end
with L.S. foc. A inserable o.f. for max size 384
with L.S. foc. B inserable o.f. for max size 288
with L.S. foc. C inserable o.f. for max size 192
0198 mignon common end - inserable o.f. for max size 72
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Quartz glass optical fiber’s bundles
Peculiarities of quartz glass optical fibers
*the lesse diameter of the monofiber avoids a greater compactness.
The quantity of light outputted by each o.f. with the selected light source
(relievable at page 327) , does not change wheter you insert one or
the maximum number of tails allowed.
Light attenuation produced by optical fiber’s lenght
The light which passes through the o.f. suffer an attenuation proportionate
to its lenght, to its quality and to the quality of the optical workprocesses.
Considering that this attenuation is measured in linear way and that
our eyes have a logarithmically perception, the lower brightness perceptable
with fibers 3-5 meter longs is negligible.
To calculate how many luxes you can obtain with a certain lenght of
o.f., is necessary to relieve on table lux output on page 327 “Light
sources for glass optical fibers”, the value of the selected o.f. and l.s.
This value, already measured with a 1 meter long fiber, is the 100% of
the above table; multiplying it for the percentage corresponding to the
used o.f. lenght, we will obtain the light quantity emitted by the o.f.
Example: HIT 150 B with size 24 o.f. lenght 4 meter = Lux 420 x 89%
= 373 Lux
Single ends
They emit the light and they can have two different finishings: with lens
(size 1 and size4) or flat polishing (size 4 - 12 - 24).
The lens finishing is to be preferred for decorations; the flat polishing
finishing is surely to be preferred for uniform lighting (items, areas,
paintings).
How is supplied the optical fiber bundle
Each o.f. tail (excluded size 1) is supplied with a label on which you
can find:
- number and/or reference of the bundle (when requested);
- o.f. size (optical diameter);
- lenght of the tail.
This avoids to recognize the collocation of the bundle and of each fiber
saving time for installation.