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Chapter 5
Remove the Micrometer Compartment cover and set it aside.
3.
Using a 5/64" hex wrench, loosen the locking set screw shown in
4.
Figure 5-4: Micrometer Locking Set Screw
While continuously acquiring data from a spectral line source, adjust the micrometer
5.
until the half width of the peak is at a minimum. Note that as focus is improved, the
intensity of the spectral line will increase. It is important to adjust the acquisition time
to keep the entire spectral line on scale.
Tighten down the locking set screw.
6.
Place the Micrometer Compartment cover on the spectrograph. Replace and tighten all
7.
of the cover screws.
5.6 Focal Plane Adjustments
During the manufacturing process, the IsoPlane focal plane is factory-aligned so that it is
precisely centered on the optical axis. However, in some instances when a CCD camera is
attached, the center pixel of the CCD camera may be located slightly off-center from the
optical axis of the spectrograph. In most applications this is not critical. However, if it is
important to have the exit focal plane image precisely centered on the CCD, the vertical and
horizontal alignment of the exit beam can be adjusted using procedures in this section.
During these adjustment procedures, the detector should be running in continuous mode so
an image of the source is displayed in the acquisition software. Continuous operation is
necessary to provide active feedback of the light source's position as adjustments are made.
We recommend using a mercury lamp with a center wavelength of 546.075 nm. However,
other light sources and center wavelengths can be used.
IsoPlane Setup
!
CAUTION!
The procedure described in this section should
performed by someone experienced in aligning optical
components and assemblies.
Figure
L
S
S
OCKING
ET
CREW
be
ONLY
35
5-4.
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