270M
Rapid Scanning Imaging Spectrograph
1.4 Dual Axis Grating Turret:
Instruments equipped
with
an optional 220TK grating
turret
pay no penalty in
optical performance
for
the convenience
of
automated grating interchange. To
maintain image quality, throughput, and flatness
of
field
it
is essential
that
the
grating is scanned
by
rotating on the correct axis. That axis is vertical,
at
the
center
of
the face
of
the grating. This turret indexes the selected grating using a
turret
pivoting axis
that
is separate from the scanning axis. Either selected grating
is positioned so
that
the center
of
its face is exactly on the scanning axis. By
scanning the grating on this axis, throughput and image quality are preserved
to
the maximum
extent
possible throughout the scanning range. Because the turret is
interchangeable, there is no limitation on the number
of
different gratings
that
can
be
mounted in a system.
Revised
November 24,
1992
3
Leica Microsystems, Inc.'s Ex. 1033
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