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Chapter 2 Detector Setup 13
Square-format CCDs can also be used for spectroscopy, although they are more often
used in imaging applications. For square format CCDs (e.g. 512 × 512 or 1300 × 1340),
the user may orient the CCD to achieve binning along either direction of the CCD.
Binning along the rows (perpendicular mode) minimizes cross-talk and is therefore better
for multi-spectral applications. The drawback to this method is that scanning is slower
and noise may increase somewhat.
Binning along columns (parallel mode) provides maximum scan rate and lowest noise.
NTE/CCD users can easily switch between these orientations by simply rotating the
detector 90°.
Deep Focal Plane Spectrographs
Spectrographs with the focal plane
25 mm or more beyond the exit
interface are called deep focal
plane spectrographs. Such
spectrographs include Acton
(adapters are available for all
Acton models), ISA HR320, ISA
HR640, Chromex 250IS, and most
instruments that are 1 meter or
longer. (If you are not sure of the
depth of the exit focal plane,
contact the spectrograph
manufacturer.)
Flange 1
Set screw
Flange 2 Detector
Figure 4. Adapter for a Deep Focal Plane Spectrograph
Adapters for these spectrographs are generally in two pieces, as shown in Figure 4. The
generic assembly directions that follow can be used as a general guide.
Mounting Directions
1.
Bolt Flange 2 to the NTE/CCD Detector using the screws provided.
2.
Next, loosen the setscrews (3) on Flange 1.
3.
Mount Flange 1 to the spectrograph.
4.
Slide Flange 2 into Flange 1.
Do not tighten the setscrews until focusing and alignment are achieved as discussed in
Chapter 4.
Shallow Focal Plane
Shallow focal plane spectrographs are ones with a focal plane that is less than 25 mm
beyond the exit interface. The detector mount provided in these cases does not allow
focusing via the adapter. Focusing must be accomplished by adjusting the spectrograph.
The generic assembly directions that follow can be used as a general guide. However,
note that detailed instructions for your specific adapter are provided in the bag of adapter
parts.