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Chapter 3 SCT 320 Operation 19
2.8.5 Height Adjustment of Image Plane
Note: This procedure should only be attempted by someone experienced in
aligning optical components and assemblies.
2.8.5.1 Overview
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 above or below 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 height of the exit beam can be
adjusted using the procedure in this section.
If you have an optical fiber and fiber adapter that can
precisely center the beam at the center of the IsoPlane
focal plane, then that can be used as a guide in positioning
the exit focal plane. If the IsoPlane is equipped with a
standard 3 mm manual entrance slit or optional 3 mm
motorized entrance slit, you can also install the supplied 4 mm high slit baffle and use the 4mm
high image as a guide in positioning the exit focal plane. The adjustment is made by adjusting
the pair of push-pull vertical alignment screws as shown in Figure 2-12.
2.8.5.2 Data Acquisition Mode
During this adjustment procedure, 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 position as adjustments are being 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.
2.8.5.3 Required Tools
5/32” hex wrench
3/32” hex wrench
2.8.5.4 Adjustment Procedure
1. Remove the Micrometer Compartment cover (Figure 2-10) to access the height adjustment
screws (Figure 2-12).
2. Determine if the image is HIGH or LOW on the detector array.
a. If the image is HIGH, alternately loosen the Cap Screw and tighten the Set Screw until
the image is centered about the center row of the camera.
Notes:
1. CAUTION: ONLY ADJUST THE CAP AND SET SCREWS INDICATED IN Figure 2-12.
ADJUSTMENTS TO OTHER SCREWS MAY RESULT IN SEVERE MISALIGNMENT OF
THE INSTRUMENT.
Figure 2-12. Height Adjustment Screws
Set Screw
Cap Screw