Filters
and
mounts
53
Goldeye
G
Technical
Manual
V
2.0.0
Specific
filter
applications
Bandpass
filter
The
Goldeye
responds
to
wavelengths
from
about
900
nm
to
1700
nm.
It
is
possible,
however,
to
restrict
the
complete
bandwidth
to
a
certain
range
of
wavelengths
by
using
a
corresponding
bandpass
filter.
That
way,
only
a
certain
wavelength
band
is
transmitted,
all
others
are
blocked.
A
bandpass
filter
is
described
by
specific
properties,
like
optical
density,
spectral
profile,
etc.
The
main
characteristic,
however,
is
the
center
wavelength
(CWL)
together
with
the
bandwidth
being
transmitted
(tolerance),
e.
g.,
the
transmission
range
of
a
water
filter
displayed
inFigure 18
below
is
at
1450 nm
with
a
tolerance
of
±50 nm.
Figure
18:
Transmission range of a water filter
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