The optical system comprises the following comwnenrs
(Fig.
5a):
semi-ganswent minor
apeme
interference filter (filter wheel)
optical fibre bundle
focusing lenses
upper lenses and dewtors
Light
source:
The light
socuce
is
a
607,8V/SOW,
which
is
equi
with
arn
aluminium-coated
elliptical
reflecmr,
To
pmlong he service
life
ofthe
lamp,
the instrument should
be
switched otfwhen not in use. Warming-up
perid
of
1
minute
has
re
be
atlowed tiefore measuring.
r wheel chops the light
lo
minimize elecuonic noise.
After
passing through the condenser lens the light
beam
impinges on he semi-
light and
all
longer wavcleng&s pass through
the
mirror,and
&c
hc
and the
arrangement
eliminates
hdg
of
the
interference
filter
and evens out
the
intensity disuibution.
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