Your choice
In choosing a fiber optic assembly to
connect to a spectrometer, choose in
accord with the spectrometer being used
and the intensity and needed resolution
of the signal and the specral region of
interest. For example, a 400 µm diameter
may be a good choice for all around
work. If the spectrometer entrance slit
in 200 µm size, a 200 µm size fiber may
be a better choice. However, if the signal
is weak, perhaps a 400 µm fiber can improve
things.
On the other hand, if resolution is the
criterion, a 100 µm fiber diameter may
slightly improve resolution in a trade off
to sensitivity.
Of more importance is the spectral range.
Some fibers do better toward the UV while
other fibers function better toward the IF.;
Also, for work into the UV, a solarization resistance
fiber is best, The charts below
show relative spectral attenuations for different
fibers.
Also for interfacing various components
in a analytical set-up, there are specialized
fiber assemblies which can be used. For example,
a bifurcated assembly should be considered
when two fiber lines is needed. For
example, in critical measurements, the illuminating
light might need to be monitored
while the light is also used to illuminate the
sample.
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