The optical system comprises the following components (Fig.
Sa):
qua&-halogen lamp
apeme and condenser lens
semi-transparent minor
apemre
interference filter (filter wheel)
optical fibre bundle
focusing lenses
upper lenses
and
detectors
Figure 3a. Optical system
Tke light source
is
a quarz-halogen lamp (Osram
64607, SVISOW),
wh~ch is equipped with an aluminium-
coated elliplid refleeror.
the
service
life of the lamp, the instrument should
he
switched off when not in use. Warmin
riod
of
I
minute
ha:
to
r
wheel chops the light beam to minimize electronic noise
Semi-tsmwenl mirror:
ARer passing through the condenser lens
the
light beam impinges on the semi-transparent mirror.
Pad
of
the
visible light and all longer wavelengths pass through the mirror, and the
UV
and the rest of the visible light is
reflected. This arrangement eliminates heating
of
the interPerence filter and evens our the
s
distribution.
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